Integral performance evaluation method and system of assembled bridge combined with static and dynamic load test

Abstract

The application provides a method and system for evaluating the overall performance of a fabricated bridge through static and dynamic load tests, belonging to the technical field of fabricated bridge detection and performance evaluation. The method establishes a full-bridge finite element model of a UHPC fully prefabricated assembled bridge to determine the static load control section, natural frequency and test load. Static destructive tests are carried out on the prefabricated UHPC bridge deck, graded static load tests are carried out on the UHPC prefabricated U-beam and the main body of the completed bridge, and the dynamic load test is carried out on the completed bridge structure by the fluctuation method to obtain key parameters such as strain and deflection data of the control section. After verification coefficient calculation and multi-dimensional weighted fusion processing, the overall performance qualification result and bearing state evaluation report are obtained, and the graded execution instruction is output. The application realizes the integrated evaluation of static and dynamic load tests, improves the detection accuracy and evaluation reliability of the UHPC fully prefabricated assembled bridge, and is suitable for the completion acceptance and operation performance evaluation of the fabricated pedestrian bridge.

Description

Technical Field

[0001] This application relates to the field of testing and performance evaluation technology for prefabricated bridges, and more specifically, to a method and system for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests. Background Technology

[0002] Currently, UHPC (Ultra-High-Precast Concrete) bridges are widely used in urban pedestrian bridge projects due to their fast construction, high quality, and strong durability. However, the overall performance evaluation of these bridges still has significant shortcomings. Traditional testing methods often involve separate static or dynamic load tests, failing to achieve systematic linkage between bridge deck component tests, main beam tests, and completed bridge tests. Finite element analysis data is disconnected from field test data, and there is a lack of unified basis for load control and section selection. Test data processing methods are simplistic, failing to form a multi-index integrated evaluation mechanism that integrates strength, stiffness, crack resistance, and dynamic characteristics. This makes it difficult to comprehensively and accurately reflect the true load-bearing state and structural safety performance of UHPC bridges, and cannot meet the refined management requirements for final acceptance and long-term operation and maintenance.

[0003] Therefore, there is an urgent need to develop an integrated performance evaluation method that can link finite element analysis, component testing, and static and dynamic load testing of completed beams, and achieve multi-index fusion evaluation. This method would address the technical shortcomings of traditional evaluation methods, such as isolated data, fragmented processes, inconsistent judgment criteria, and incomplete evaluation results. It would then accurately reflect the true structural load-bearing state and safety performance of UHPC fully prefabricated assembled bridges, and meet the refined, standardized, and intelligent requirements for project completion acceptance, operation and maintenance management, and long-term safety monitoring. Summary of the Invention

[0004] This invention addresses the problems of fragmented testing processes, insufficient data fusion, and single evaluation dimensions in existing UHPC (Ultra-High-Pressure Construction) prefabricated bridge performance evaluation technologies. It provides a method and system for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests. The method involves constructing a finite element model of the entire bridge based on component parameters and the structural system to determine test control parameters. Static destructive tests with mixed load and displacement control are conducted on the prefabricated UHPC bridge deck; graded equivalent load static load tests are conducted on the prefabricated U-beams and the main body of the completed bridge; and pulsating dynamic load tests are conducted on the completed bridge structure. Test data such as strain, deflection, and natural frequency are acquired and processed, and verification coefficients are calculated. Then, multi-dimensional weighted fusion processing is performed on strength and stiffness indices, crack resistance indices, and dynamic characteristic indices to finally obtain the overall performance qualification judgment result and load-bearing status assessment report. Matching and outputting graded execution instructions for completion acceptance and operation and maintenance management, this invention achieves integrated, high-precision, and systematic overall performance evaluation of UHPC prefabricated bridges from component to completed bridge, and from static to dynamic loads.

[0005] This application provides a method for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests, including the following steps:

[0006] Based on the component parameters and structural system of the UHPC fully prefabricated assembled bridge, a finite element model of the entire bridge was established to obtain the static load control section, natural frequency and test load.

[0007] Based on the static load control section and the test load, a static destructive test was carried out on the precast UHPC bridge deck. The load and displacement hybrid control mode was used for loading to obtain data on cracking load, peak load, mid-span deflection and main crack width.

[0008] Based on the test load and static load control section, equivalent design loads were applied to the UHPC precast U-beam and the main structure of the completed bridge in stages, and static load tests were carried out to obtain strain and deflection data of the control section.

[0009] Based on the strain and deflection data, strain and deflection verification coefficients are obtained;

[0010] Based on the natural frequency, a dynamic load test was conducted on the bridge structure using the pulsation method. Vertical vibration response data was collected, the measured natural frequency was identified and compared with the theoretical natural frequency, and the overall stiffness evaluation result was obtained.

[0011] Based on the strength and stiffness index and crack resistance index corresponding to the static load test and the dynamic characteristic index corresponding to the dynamic load test, a multi-dimensional weighted fusion process is performed to obtain the overall performance qualification judgment result and load-bearing status assessment report of the UHPC fully prefabricated assembled bridge.

[0012] In the method for evaluating the overall performance of prefabricated bridges combining static and dynamic load tests described in this application, the step of establishing a full-bridge finite element model based on the component parameters and structural system of the UHPC fully prefabricated bridge to obtain the static load control section, natural frequency, and test load specifically involves:

[0013] Based on the component parameters and structural system of the UHPC fully prefabricated assembled bridge, a finite element model of the entire bridge was established.

[0014] Based on the dimensions of the precast components, material mechanical parameters, boundary constraints, and combined load conditions, the internal force envelope calculation and natural vibration characteristic analysis are performed using the full-bridge finite element model.

[0015] Based on the results of the internal force envelope calculation and natural vibration characteristic analysis, the static load control section, natural frequency, and test load are obtained.

[0016] In the method for evaluating the overall performance of prefabricated bridges combining static and dynamic load tests described in this application, the step of conducting a static destructive test on the prefabricated UHPC bridge deck based on the static load control section and the test load, using a load and displacement hybrid control mode for loading, and obtaining data on cracking load, peak load, mid-span deflection, and main crack width, specifically:

[0017] Based on the static load control section and the test load, positive bending moment loading model and negative bending moment loading model are established for the precast UHPC bridge deck respectively.

[0018] Based on the positive bending moment loading model and the negative bending moment loading model, a staged load-bearing loading is performed using a mixed load and displacement control method.

[0019] Based on the structural response data during the loading process, the cracking load, peak load, mid-span deflection, and main crack width data are obtained.

[0020] In the method for evaluating the overall performance of prefabricated bridges combining static and dynamic load tests described in this application, the step of applying equivalent design loads to the UHPC prefabricated U-beams and the main structure of the completed bridge in stages according to the test loads and static load control sections, conducting static load tests, and obtaining strain and deflection data of the control sections specifically involves:

[0021] Based on the test load and static load control section, determine the equivalent design load graded application scheme for the UHPC precast U-beam and the main structure of the completed bridge;

[0022] According to the graded application scheme, equivalent design loads were applied to the UHPC precast U-beams and the main structure of the completed bridge in stages, and static load tests were carried out.

[0023] Based on the structural monitoring signals during the static load test, the strain and deflection data of the control section are collected and obtained synchronously.

[0024] In the method for evaluating the overall performance of prefabricated bridges combining static and dynamic load tests described in this application, the step of obtaining the strain and deflection verification coefficients based on the strain and deflection data specifically involves:

[0025] Based on the strain and deflection data of the control section obtained from the static load test, data processing is performed in accordance with preset calculation rules;

[0026] Based on the processed measured strain value and the theoretical value, the strain verification coefficient is obtained;

[0027] The deflection verification coefficient is obtained based on the processed measured and theoretical deflection values.

[0028] In the method for evaluating the overall performance of prefabricated bridges combining static and dynamic load tests described in this application, the step of conducting dynamic load tests on the completed bridge structure using the pulsation method based on the natural frequency, collecting vertical vibration response data, and identifying the measured natural frequency specifically involves:

[0029] Based on the natural frequency, a dynamic load test was conducted on the completed bridge structure using the pulsation method to collect raw data on the vertical vibration response.

[0030] The original vertical vibration response data is processed in the time domain and analyzed in the frequency domain to remove environmental interference data components.

[0031] Based on the processed vibration response data, feature identification is performed to obtain the measured natural frequency of the bridge structure.

[0032] In the method for evaluating the overall performance of prefabricated bridges combining static and dynamic load tests described in this application, the step of performing multi-dimensional weighted fusion processing based on the strength and stiffness indicators and crack resistance indicators corresponding to the static load test and the dynamic characteristic indicators corresponding to the dynamic load test to obtain the overall performance qualification judgment result and load-bearing state assessment report of the UHPC fully prefabricated assembled bridge is as follows:

[0033] According to the preset weighting configuration rules, the strength and stiffness index, crack resistance index and dynamic characteristic index are weighted and allocated accordingly.

[0034] Normalization is performed based on the assigned weights and the data of each indicator.

[0035] The overall performance qualification and load-bearing status assessment report of the UHPC fully prefabricated assembled bridge are obtained by comparing the calculation results with the preset judgment threshold.

[0036] In the method for evaluating the overall performance of prefabricated bridges combining static and dynamic load tests described in this application, after the overall performance qualification judgment result and load-bearing state assessment report are generated, it further includes:

[0037] Based on the overall performance qualification assessment results and the load-bearing status assessment report, the preset completion acceptance and operation and maintenance management classification rules are matched.

[0038] Based on the classification rules and the classification information corresponding to the judgment results, classification execution instructions for completion acceptance and operation and maintenance management are generated and output.

[0039] Secondly, this application provides a system for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests, including:

[0040] The finite element modeling and analysis module is used to establish a full bridge finite element model based on the component parameters and structural system of the UHPC fully prefabricated assembled bridge, and to obtain the static load control section, natural frequency and test load.

[0041] The bridge deck destructive test module is used to conduct static destructive tests on the precast UHPC bridge deck according to the static load control section and the test load. The load and displacement hybrid control mode is used to obtain data on cracking load, peak load, mid-span deflection and main crack width.

[0042] The static load test module for the completed bridge is used to apply equivalent design loads to the UHPC precast U-beams and the main structure of the completed bridge in stages according to the test load and static load control section, and to carry out static load tests to obtain strain and deflection data of the control section.

[0043] The parameter calculation module is used to obtain strain and deflection verification coefficients based on the strain and deflection data;

[0044] The dynamic load testing module for the completed bridge is used to conduct dynamic load tests on the completed bridge structure using the pulsation method based on the natural frequency, collect vertical vibration response data, identify the measured natural frequency and compare it with the theoretical natural frequency to obtain the overall stiffness evaluation result.

[0045] The fusion evaluation output module is used to perform multi-dimensional weighted fusion processing based on the strength and stiffness index, crack resistance index, and dynamic characteristic index corresponding to the static load test and the dynamic load test, to obtain the overall performance qualification judgment result and load-bearing status assessment report of the UHPC fully prefabricated assembled bridge.

[0046] The system also includes a memory and a processor, the memory containing a program for an overall performance evaluation method of prefabricated bridges combined with static and dynamic load tests, wherein when the program for the overall performance evaluation method of prefabricated bridges combined with static and dynamic load tests is executed by the processor, the overall performance evaluation method of prefabricated bridges combined with static and dynamic load tests as described in any of the first aspects is implemented.

[0047] As can be seen from the above, this invention addresses the problems of fragmented testing processes, insufficient data fusion, single evaluation dimensions, disconnect between finite element analysis and field testing, and inability to link multi-condition tests in existing UHPC fully prefabricated assembled bridge performance evaluation technologies. It provides a method and system for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests. By establishing a full-bridge finite element model based on the component parameters and structural system of the UHPC fully prefabricated assembled bridge, and uniformly determining the static load control section, natural frequency, and test load, the following steps are performed: static destructive tests with mixed load and displacement control are conducted on the prefabricated UHPC bridge deck; graded equivalent load static load tests are conducted on the UHPC prefabricated U-beams and the main body of the completed bridge; and the completed bridge structure... Dynamic load tests were conducted using the pulsation method, simultaneously collecting data on strain, deflection, crack width, and vibration response. Strain verification coefficients, deflection verification coefficients, and measured natural frequencies were calculated according to specifications. Then, strength and stiffness indices, crack resistance indices, and dynamic characteristic indices were multi-dimensionally weighted and fused, and threshold judgments were applied. Finally, the overall performance qualification assessment results, load-bearing status evaluation reports, and corresponding completion acceptance and operation and maintenance management hierarchical execution instructions for the UHPC fully prefabricated assembled bridge were output. This achieved a fully integrated, standardized, and accurate overall performance assessment from component testing to bridge evaluation, and from static testing to dynamic characteristic analysis, effectively improving the reliability, comprehensiveness, and engineering applicability of the assessment results.

[0048] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0049] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 A high-level flowchart of the method for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests, provided in the embodiments of this application.

[0051] Figure 2 A flowchart of a method for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests, provided in an embodiment of this application;

[0052] Figure 3 The structural block diagram of the prefabricated bridge overall performance evaluation system combining static and dynamic load tests provided in the embodiments of this application is shown. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0054] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first" and "second" are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use, and processing of related data must comply with the relevant laws, regulations, and standards of the relevant countries and regions.

[0055] Please refer to Figure 1 , Figure 1 This is a high-level flowchart of a method for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests, as described in some embodiments of this application. The high-level flowchart can be summarized as follows: First, a finite element model of the entire bridge is established based on the component parameters and structural system of the UHPC fully prefabricated bridge, and the test control parameters are determined. Then, static destructive tests are conducted on the prefabricated UHPC bridge deck, static load tests are conducted on the prefabricated U-beams and the main body of the completed bridge, and dynamic load tests are conducted on the completed bridge structure using the pulsating method, collecting relevant test data. Subsequently, verification coefficients are calculated to evaluate the overall stiffness. Finally, multiple indicators are integrated and weighted to obtain the overall bridge performance judgment result and load-bearing status assessment report.

[0056] Please refer to Figure 2 , Figure 2 This is a flowchart of a method for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests, as described in some embodiments of this application.

[0057] The method for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests, disclosed in the first aspect of this invention, is used in terminal devices, such as computers and mobile terminals. This method for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests includes the following steps:

[0058] S201. Based on the component parameters and structural system of the UHPC fully prefabricated assembled bridge, establish a finite element model of the entire bridge to obtain the static load control section, natural frequency and test load.

[0059] S202. Based on the static load control section and the test load, a static destructive test is carried out on the precast UHPC bridge deck. The load and displacement mixed control mode is used for loading to obtain data on cracking load, peak load, mid-span deflection and main crack width.

[0060] S203. Based on the test load and static load control section, apply equivalent design loads to the UHPC precast U-beam and the main structure of the completed bridge in stages, conduct static load tests, and obtain strain and deflection data of the control section.

[0061] S204. Based on the strain and deflection data, obtain the strain and deflection verification coefficients;

[0062] S205. Based on the natural frequency, a dynamic load test is conducted on the bridge structure using the pulsation method to collect vertical vibration response data, identify the measured natural frequency and compare it with the theoretical natural frequency to obtain the overall stiffness evaluation result.

[0063] S206. Based on the strength and stiffness index and crack resistance index corresponding to the static load test and the dynamic characteristic index corresponding to the dynamic load test, a multi-dimensional weighted fusion process is performed to obtain the overall performance qualification judgment result and load-bearing status assessment report of the UHPC fully prefabricated assembled bridge.

[0064] In this process, a finite element model of the entire bridge was established based on the component parameters and structural system of the UHPC fully prefabricated bridge. Internal force envelope calculations and natural vibration characteristic analysis were performed by combining the dimensions of the prefabricated components, material mechanical parameters, boundary constraints, and combined load conditions to obtain the static load control section, natural frequency, and test load. Subsequently, based on the above parameters, positive and negative bending moment loading models were constructed for the prefabricated UHPC bridge deck. A graded load-bearing method using a mixed load and displacement control was adopted to obtain data on cracking load, peak load, mid-span deflection, and main crack width. Simultaneously, according to the equivalent design load graded application scheme, the UHPC prefabricated U-beams and the main structure of the completed bridge were gradually loaded and static load tests were conducted, collecting strain and deflection data of the control section. Based on the above test data, the results were processed according to preset calculation rules to obtain… The process involves obtaining strain and deflection verification coefficients, then conducting dynamic load tests on the completed bridge using the pulsation method based on the natural frequency. The raw vertical vibration response data undergoes time-domain processing and frequency-domain analysis, and environmental interference components are removed to identify the measured natural frequency. This is then compared with the theoretical natural frequency to obtain the overall stiffness assessment result. Finally, based on preset weighting rules, the strength stiffness index, crack resistance index, and dynamic characteristic index are weighted and normalized. Combined with the judgment threshold comparison, the overall performance qualification judgment result and load-bearing status assessment report of the UHPC fully prefabricated assembled bridge are obtained. Furthermore, it can be matched with the completion acceptance and operation and maintenance management grading rules to output corresponding grading execution instructions, thereby achieving integrated overall performance assessment from component testing to completed bridge evaluation, and from static testing to dynamic characteristic analysis.

[0065] According to an embodiment of the present invention, the step of establishing a finite element model of the entire bridge based on the component parameters and structural system of the UHPC fully prefabricated assembled bridge, and obtaining the static load control section, natural frequency, and test load, specifically involves:

[0066] Based on the component parameters and structural system of the UHPC fully prefabricated assembled bridge, a finite element model of the entire bridge was established.

[0067] Based on the dimensions of the precast components, material mechanical parameters, boundary constraints, and combined load conditions, the internal force envelope calculation and natural vibration characteristic analysis are performed using the full-bridge finite element model.

[0068] Based on the results of the internal force envelope calculation and natural vibration characteristic analysis, the static load control section, natural frequency, and test load are obtained.

[0069] This scheme establishes a full-bridge finite element model based on the actual component parameters (including the geometric dimensions and connection methods of prefabricated components) and the overall structural system (including bridge support forms and force transmission paths) of the UHPC fully prefabricated bridge. This ensures that the model can accurately replicate the actual structural form and stress characteristics of the bridge. The dimensions of the prefabricated components, the mechanical parameters of the UHPC material (such as compressive strength, tensile strength, and modulus of elasticity), the actual boundary constraints of the bridge (such as fixed-end and hinged support constraints), and various combined load conditions that may occur in actual engineering (such as dead load, live load, and various unfavorable load combinations) are all input into the established full-bridge finite element model. The model is then used for comprehensive internal force envelope calculation and structural natural vibration characteristic analysis. The internal force envelope calculation is used to determine the bridge's natural vibration characteristics. The section with the highest internal force under various loads is analyzed for natural vibration characteristics to clarify the inherent vibration characteristics of the bridge. Based on the accurate results of the internal force envelope calculation and natural vibration characteristic analysis, the static load control section (i.e., the section with the most unfavorable internal force and requiring key monitoring), natural frequency (i.e., the bridge vibration mode requiring key monitoring), and test load (i.e., the reasonable range of test load values) required for subsequent tests are comprehensively determined. This provides standardized and precise control parameter support for the smooth conduct of subsequent static destructive tests of precast UHPC bridge decks, static load tests of UHPC precast U-beams and the main structure of the completed bridge, and dynamic load tests of the completed bridge structure. This ensures that the parameter selection and load application in each test stage conform to the actual stress characteristics of the bridge, guarantees the scientificity and reliability of the overall evaluation method, and avoids inaccurate evaluation results due to deviations in test parameters.

[0070] According to an embodiment of the present invention, a static destructive test is conducted on the precast UHPC bridge deck based on the static load control section and the test load. A mixed load and displacement control mode is used for loading to obtain data on cracking load, peak load, mid-span deflection, and main crack width. Specifically:

[0071] Based on the static load control section and the test load, positive bending moment loading model and negative bending moment loading model are established for the precast UHPC bridge deck respectively.

[0072] Based on the positive bending moment loading model and the negative bending moment loading model, a staged load-bearing loading is performed using a mixed load and displacement control method.

[0073] Based on the structural response data during the loading process, the cracking load, peak load, mid-span deflection, and main crack width data are obtained.

[0074] Specifically, combining the established static load control section (i.e., the section with the most unfavorable internal forces in the bridge and requiring key monitoring) and the test load (i.e., the reasonable range of test load values), positive and negative bending moment loading models were established for the stress characteristics of the precast UHPC bridge deck. This ensures that the loading models can accurately match the two extreme stress states that the bridge deck may experience during actual use, avoiding incomplete test data due to a single loading model. Based on the established positive and negative bending moment loading models, a loading mode with mixed load and displacement control was adopted. Gradual loading was performed according to preset grading standards, and the corresponding holding time was maintained. During the loading process, the load application amount and bridge deck displacement changes were monitored simultaneously to achieve dual precise control of load and displacement, preventing excessively rapid loading or abnormal loads from causing test failures. To prevent data distortion, during the entire process of graded loading, the structural response data of the bridge deck is collected in real time. Combined with the cracking phenomenon, peak load, mid-span displacement change and crack development of the bridge deck during loading, key data such as cracking load (the load when the bridge deck first cracks), peak load (the maximum load that the bridge deck can withstand), mid-span deflection (the displacement of the bridge deck at the mid-span during loading) and main crack width (the actual width of the main crack) are accurately extracted and determined. This provides real and reliable component-level test data support for the judgment of strength indicators and crack resistance in the subsequent overall performance evaluation, ensuring the comprehensiveness and accuracy of the overall evaluation method. It is closely related to the control parameters provided by the finite element model and the subsequent static and dynamic load tests of the completed bridge to form a complete test system.

[0075] According to an embodiment of the present invention, the step of applying equivalent design loads in stages to the UHPC precast U-beam and the main structure of the completed bridge based on the test load and the static load control section, and conducting static load tests to obtain strain and deflection data of the control section, specifically involves:

[0076] Based on the test load and static load control section, determine the equivalent design load graded application scheme for the UHPC precast U-beam and the main structure of the completed bridge;

[0077] According to the graded application scheme, equivalent design loads were applied to the UHPC precast U-beams and the main structure of the completed bridge in stages, and static load tests were carried out.

[0078] Based on the structural monitoring signals during the static load test, the strain and deflection data of the control section are collected and obtained synchronously.

[0079] Based on the reasonable range of test loads determined through the finite element model analysis of the entire bridge in the early stage, and combined with the identified static load control sections (i.e., the key sections with the most unfavorable internal forces in the bridge and requiring key monitoring) and their corresponding key monitoring points, a scientifically formulated graded application scheme for the equivalent design loads of the UHPC precast U-beams and the main structure of the completed bridge was developed. This scheme requires consideration of the mechanical properties of the UHPC material, the structural bearing capacity of the precast U-beams, and the force transmission path of the main structure of the completed bridge. It clarifies the specific application amount of each equivalent design load (ensuring the load value is within the test load range, meeting the testing requirements while avoiding excessive load that could damage the structure), the holding time of each load level (ensuring structural stability and ensuring that the monitoring data accurately reflects the steady-state response of the structure under that load), and the monitoring nodes corresponding to each load level (clarifying the specific locations and monitoring frequencies for data collection). By precisely planning the loading parameters, it effectively avoids data distortion caused by excessively rapid load application, uneven load distribution, or insufficient holding time, laying the foundation for the accuracy of the test data. Strictly following the established tiered loading scheme, equivalent design loads were applied to the UHPC precast U-beams and the main structure of the completed bridge in stages, while static load tests were conducted simultaneously. Throughout the loading process, the preset loading specifications were followed, and the loading rate was controlled to be uniform and stable to ensure that the loading process was controllable. The loading conditions closely resembled the actual stress scenarios in bridge engineering (such as the stress state under dead load and live load), making the test results more valuable for engineering reference. At the same time, the loading control logic was consistent with that of the previous static destructive test of the precast UHPC bridge deck, ensuring the standardization of the entire static load test system. Finally, throughout the static load test, specialized monitoring equipment such as strain gauges and displacement meters were used to capture the structural response signals of the UHPC precast U-beams and the main structure of the completed bridge in real time. Strain data (reflecting the degree of deformation after structural stress) and deflection change data (reflecting the stiffness performance of the structure) at the static load control section were collected synchronously and accurately. Data recording and synchronous verification were meticulously performed during the data collection process to ensure that each set of data accurately and truthfully reflects the actual stress state of the UHPC precast U-beams and the main structure of the completed bridge, effectively avoiding data omissions and deviations. The data collected in this part will directly serve as the core basis for subsequent calculations of strain and deflection verification coefficients. It will also be compared with the theoretical data obtained from the previous finite element model analysis and complement the dynamic characteristic data obtained from subsequent dynamic load tests, together forming a complete data system for overall performance evaluation. This ensures the standardization and repeatability of the test process, as well as the completeness, reliability, and usability of the test data, further enhancing the scientific nature and engineering applicability of the entire evaluation method.

[0080] According to an embodiment of the present invention, obtaining the strain and deflection verification coefficients based on the strain and deflection data specifically involves:

[0081] Based on the strain and deflection data of the control section obtained from the static load test, data processing is performed in accordance with preset calculation rules;

[0082] Based on the processed measured strain value and the theoretical value, the strain verification coefficient is obtained;

[0083] The deflection verification coefficient is obtained based on the processed measured and theoretical deflection values.

[0084] Before data processing, the control section strain data and mid-span deflection data collected synchronously during the static load test were systematically organized and screened. The focus was on identifying and removing abnormal data (such as abrupt changes, data deviating from reasonable ranges, and duplicate or invalid data) caused by factors such as monitoring equipment failure, fluctuations in loading conditions, and environmental interference. All such abnormal data was discarded to prevent invalid data from interfering with subsequent calculation results and performance evaluation. After removing abnormal data, data standardization was strictly performed according to preset calculation rules. These rules conform to the mechanical properties of UHPC materials, the stress characteristics of bridge structures, and relevant engineering testing specifications. Specifically, these rules included data unit unification, numerical rounding, and steady-state data extraction, ensuring that the processed data remained consistent in magnitude and format, possessing comparability and computability. This ensured the accuracy and standardization of the data from the source, laying the foundation for the accurate calculation of subsequent verification coefficients. The standardized measured strain values ​​(i.e., the strain data of the control section actually monitored in the static load test) are compared with the theoretical strain values ​​calculated by the finite element model of the whole bridge. The specific calculation method is the ratio of the measured strain value to the theoretical strain value. The strain verification coefficient is obtained from this ratio. This coefficient is the core quantitative indicator reflecting the degree of deviation between the actual strain and the theoretical strain of the bridge structure. The closer the coefficient is to 1, the better the actual stress state of the structure matches the theoretical calculation state, and the better the structural strength performance meets the design requirements. At the same time, the same comparison logic is used to compare the processed measured deflection values ​​with the theoretical deflection values ​​calculated by the finite element model to obtain the deflection verification coefficient. This coefficient can intuitively reflect the stiffness performance of the bridge structure. The smaller the coefficient, the smaller the deformation of the structure under load, the better the stiffness performance, and the more effectively it can reflect the structure's ability to resist deformation. The aforementioned strain and deflection verification coefficients are complementary and indispensable, collectively constituting the core quantitative indicators for evaluating the strength, stiffness, and stability of the UHPC precast U-beams and the main structure of the completed bridge. The obtained data will directly serve as the core data support for subsequent multi-dimensional weighted fusion evaluations, fully adhering to the technical logic of the preliminary finite element modeling analysis and static load testing. Simultaneously, the entire data processing process strictly follows preset rules, effectively ensuring the scientific validity, reliability, and engineering applicability of the subsequent overall performance evaluation results, providing accurate and robust data support for determining the bridge's performance qualification and assessing its load-bearing status.

[0085] According to an embodiment of the present invention, the step of conducting a dynamic load test on the bridge structure using the pulsation method based on the natural frequency, collecting vertical vibration response data, and identifying the measured natural frequency specifically involves:

[0086] Based on the natural frequency, a dynamic load test was conducted on the completed bridge structure using the pulsation method to collect raw data on the vertical vibration response.

[0087] The original vertical vibration response data is processed in the time domain and analyzed in the frequency domain to remove environmental interference data components.

[0088] Based on the processed vibration response data, feature identification is performed to obtain the measured natural frequency of the bridge structure.

[0089] Based on the natural vibration frequencies determined through the preliminary analysis of the natural vibration characteristics of the full-bridge finite element model (i.e., the inherent vibration modes that need to be monitored in the completed bridge structure, clarifying the direction, location, and frequency range of vibration monitoring), dynamic load tests were conducted on the completed bridge structure using the pulsation method. The pulsation method does not require additional artificial excitation; it only utilizes environmental pulsations (such as minor vibrations generated by vehicle movement, wind, and human activity) as the excitation source, simulating the vibration scenario of the completed bridge structure during actual service. During the test, vibration sensors were deployed at key monitoring points corresponding to the natural vibration frequencies to simultaneously collect raw data on the vertical vibration response of the completed bridge structure. The sampling frequency and sampling duration were strictly controlled during the data collection process to ensure that the collected raw data could fully cover the real state of structural vibration, with no data omissions or sampling distortions, providing complete and accurate basic data for subsequent data processing and feature recognition. Because the raw vertical vibration response data inevitably contains invalid data components caused by environmental interference (such as wind interference, ambient noise, and sensor errors), this interference data can severely affect the accuracy of the measured natural frequency identification. Therefore, systematic time-domain processing and frequency-domain analysis of the raw data are necessary. Time-domain processing mainly includes data smoothing, trend removal, and outlier elimination to normalize the raw data and eliminate data fluctuation interference. Frequency-domain analysis uses professional algorithms such as Fourier transform to convert the time-domain vibration signal into a frequency-domain signal, accurately separating the effective vibration signal from the environmental interference components, and accurately eliminating invalid interference data. This ensures that the processed data can truly reflect the vibration characteristics of the bridge structure itself, avoiding test result deviations caused by interference factors, and providing a guarantee for the accurate identification of the subsequent measured natural frequency. Based on the clean vibration response data after time-domain processing and frequency-domain analysis, modal recognition algorithms are used to identify vibration features, focusing on extracting the natural frequency characteristics of the bridge structure to accurately obtain the measured natural frequency of the bridge structure. The measured natural frequency is a core parameter reflecting the dynamic characteristics of the completed bridge structure and is directly related to the overall stiffness of the structure. It can be compared with the theoretical natural frequency calculated by the finite element model in the previous stage. The degree of frequency deviation can be used to assess the overall stiffness state of the completed bridge structure. Simultaneously, this measured natural frequency will be used as a dynamic characteristic index and incorporated into the subsequent multi-dimensional weighted fusion evaluation system, providing reliable dynamic parameter support for the overall performance qualification and load-bearing status assessment of the bridge. The entire dynamic load test process, together with the previous finite element modeling and analysis, static load test implementation, and data processing, forms a complete performance evaluation system. The test principles, operating procedures, and overall technical solutions are highly compatible, effectively realizing the synergistic linkage between dynamic load testing, static load testing, and finite element analysis. This further enhances the scientific rigor, accuracy, and engineering applicability of the overall performance evaluation method for the UHPC fully prefabricated assembled bridge.

[0090] According to an embodiment of the present invention, the multi-dimensional weighted fusion processing is performed based on the strength and stiffness index and crack resistance index corresponding to the static load test and the dynamic characteristic index corresponding to the dynamic load test to obtain the overall performance qualification judgment result and load-bearing state assessment report of the UHPC fully prefabricated assembled bridge, specifically as follows:

[0091] According to the preset weighting configuration rules, the strength and stiffness index, crack resistance index and dynamic characteristic index are weighted and allocated accordingly.

[0092] Normalization is performed based on the assigned weights and the data of each indicator.

[0093] The overall performance qualification and load-bearing status assessment report of the UHPC fully prefabricated assembled bridge are obtained by comparing the calculation results with the preset judgment threshold.

[0094] Specifically, considering the structural characteristics, stress features, and practical engineering application requirements of the UHPC fully prefabricated bridge, and following preset weighting rules, reasonable weight proportions are assigned to the strength and stiffness indicators and crack resistance indicators corresponding to static load tests, and the dynamic characteristic indicators corresponding to dynamic load tests. The weighting allocation must fully align with the stress logic of the bridge structure, prioritizing core indicators affecting structural safety (such as strength and crack resistance) while also considering the reference value of dynamic characteristic indicators. This ensures that the weighting allocation is scientific, reasonable, and consistent with engineering realities, avoiding evaluation biases caused by weight imbalances. For various indicator data of different dimensions and magnitudes (such as strain data for strength indicators, crack width data for crack resistance indicators, and vibration response data for dynamic indicators), normalization calculations are performed. By unifying the data magnitude and eliminating dimensional differences, various indicator data are converted into standardized data under a unified standard, ensuring that indicators of different dimensions can be directly compared and integrated, effectively avoiding evaluation errors caused by differences in data magnitude. All normalized indicator data are comprehensively compared with preset judgment thresholds (set in conjunction with bridge design standards, industry specifications, and actual engineering needs). Based on the comparison results, the overall performance of the bridge is determined to be qualified or not. A detailed load-bearing status assessment report is generated, clearly stating the bridge's current structural safety level, load-bearing capacity level, potential risk points, and corresponding prevention and control recommendations, providing a clear basis for final acceptance and daily operation and maintenance. The entire process strictly follows the preliminary technical logic, seamlessly integrating with finite element modeling, static and dynamic load testing, and data acquisition, ensuring both the standardization and repeatability of the assessment process and the accuracy and comprehensiveness of the assessment results, fully meeting the needs of practical engineering applications.

[0095] According to an embodiment of the present invention, after the overall performance qualification judgment result and load-bearing status assessment report are generated, the method further includes:

[0096] Based on the overall performance qualification assessment results and the load-bearing status assessment report, the preset completion acceptance and operation and maintenance management classification rules are matched.

[0097] Based on the classification rules and the classification information corresponding to the judgment results, classification execution instructions for completion acceptance and operation and maintenance management are generated and output.

[0098] After the overall performance qualification assessment results and load-bearing status evaluation report are generated, further supporting operations need to be carried out to ensure that the performance evaluation forms a closed loop with the actual completion acceptance and operation and maintenance management. Based on the generated overall performance qualification assessment results and load-bearing status evaluation report, the preset completion acceptance and operation and maintenance management classification rules are accurately matched. These rules strictly adhere to the structural characteristics of the UHPC fully prefabricated bridge, clearly defining the completion acceptance standards, operation and maintenance management requirements, and specific operating procedures corresponding to different performance levels. This ensures that the rules are highly consistent with the actual performance status of the bridge, the results of previous finite element analysis, and static and dynamic load test data, without any technical conflicts. Combining the performance level corresponding to the assessment results with the classification rules, targeted completion acceptance execution instructions and operation and maintenance management execution instructions are generated: the completion acceptance instructions clearly define the acceptance process, qualification standards, and key inspection points adapted to the current bridge performance, ensuring that the completion acceptance process matches the actual performance of the bridge and avoiding discrepancies between acceptance standards and actual conditions; the operation and maintenance management instructions clearly define the subsequent monitoring frequency, key monitoring parts, maintenance cycle, and hidden danger investigation requirements, accurately addressing the structural characteristics and performance shortcomings of the bridge. All instructions are strictly integrated with the preliminary finite element modeling, static and dynamic load testing, and data processing stages to ensure consistency with the overall technical solution. This ensures that the instructions not only conform to the characteristics of UHPC materials and the stress logic of bridge structures, but also meet the refined management and control requirements for final acceptance and long-term operation and maintenance. This achieves a complete closed loop from performance evaluation to implementation, while also ensuring the operability and traceability of the instructions, further improving the overall technical system and enhancing the practicality and feasibility of the solution.

[0099] According to an embodiment of the present invention, after obtaining the test load, the method further includes:

[0100] Based on the test load and static load control section, establish a corresponding correlation model between the test load and the monitoring data;

[0101] The consistency of the static load test and dynamic load test data is verified based on the corresponding correlation model.

[0102] Based on the verification results, complete the validity marking of the test data and the removal of abnormal data.

[0103] Based on the pre-determined test loads (derived from the finite element model analysis of the entire bridge) and static load control sections (focusing on key stress-bearing parts), a correlation model was established between the test loads and on-site monitoring data. This model fully integrates the properties of UHPC materials and the stress patterns of bridge structures, clarifying the correspondence between the amount and rhythm of test load application and the acquisition of monitoring data. This achieves precise linkage between finite element theoretical analysis data and actual on-site test data, ensuring consistency in parameters and magnitude, guaranteeing the uniformity and rationality of test parameters, and avoiding the problem of disconnect between theory and practice from the outset. Based on this correlation model, the consistency of all data collected from the on-site static load tests (including bridge deck and main structure loading tests) and dynamic load tests was verified. The focus was on checking whether the applied test loads met the efficiency range requirements, whether the strain and deflection data of the control sections matched the finite element analysis results, and whether the vibration response data truly reflected the actual state of the structure. This accurately identified data deviations caused by uneven loading, environmental interference, and other factors, ensuring the accuracy and correlation of various test data. Based on the consistency verification results, valid data that meets the requirements is marked and retained, while invalid data with abnormalities or excessive deviations is removed. This ensures that all data used for subsequent performance evaluation is authentic, reliable, and compliant with specifications. It forms a complete closed loop with the previous finite element modeling and test implementation stages, and provides solid data support for subsequent multi-index weighted fusion and performance judgment, ensuring that the entire test process and data processing are traceable and reproducible.

[0104] According to an embodiment of the present invention, after obtaining the overall performance qualification judgment result and the load-bearing status assessment report, the method further includes:

[0105] Based on the overall performance qualification results, a performance archive database for UHPC fully prefabricated assembled bridges is established.

[0106] Based on the performance archive database and historical test data, perform bridge performance trend analysis and deterioration early warning calculation;

[0107] Based on the analysis and calculation results, data recommendations for long-term bridge operation and maintenance monitoring are generated.

[0108] Based on the established overall performance qualification results, full-process test data, and load-bearing status assessment conclusions of the bridge, a dedicated performance archive database for the bridge will be established. This database must comprehensively and meticulously record the bridge's core information, including but not limited to test parameters (such as load application standards and loading rhythm), test data at each stage (strain and deflection data from static load tests, vibration response data from dynamic load tests), performance level assessment results, and key structural parameters. This will enable full traceability and verification of the performance of a single bridge, providing complete data support for subsequent operation and maintenance management and performance re-evaluation, while also meeting the completeness requirements of patent technology disclosure. Based on the established dedicated performance archive database, combined with historical test data from similar bridges and industry standard requirements, bridge performance trend analysis and degradation risk assessment will be conducted. By comparing test data from different periods, the changes in bridge performance over time will be analyzed to accurately identify potential performance degradation trends. Simultaneously, by combining the mechanical properties of UHPC materials, structural degradation risk calculations will be performed to accurately locate potential structural hazards (such as material aging and loosening of connections), allowing for early warning and preparation to avoid safety hazards caused by undetected performance degradation. Based on the performance trend analysis results and degradation risk assessment conclusions, targeted long-term operation and maintenance monitoring recommendations are generated, clarifying the key monitoring areas, monitoring frequencies, and maintenance priorities for subsequent operation and maintenance. For example, the monitoring frequency is increased for areas with rapid performance degradation, and specific maintenance plans are developed for structurally weak links. At the same time, the recording requirements for operation and maintenance data are clarified to ensure that subsequent operation and maintenance work is traceable and verifiable.

[0109] Please refer to Figure 3 , Figure 3 This is a structural block diagram of the prefabricated bridge overall performance evaluation system combining static and dynamic load tests provided in the embodiments of this application.

[0110] The second aspect of this invention also discloses a system for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests, comprising:

[0111] The finite element modeling and analysis module 301 is used to establish a full bridge finite element model based on the component parameters and structural system of the UHPC fully prefabricated assembled bridge, and to obtain the static load control section, natural frequency and test load.

[0112] Bridge deck destructive test module 302 is used to conduct static destructive tests on precast UHPC bridge decks according to the static load control section and test load. The load and displacement mixed control mode is used to obtain cracking load, peak load, mid-span deflection and main crack width data.

[0113] The static load test module 303 is used to apply equivalent design loads to the UHPC precast U-beam and the main structure of the completed bridge in stages according to the test load and static load control section, and to carry out static load tests to obtain strain and deflection data of the control section.

[0114] Parameter calculation module 304 is used to obtain strain and deflection verification coefficients based on the strain and deflection data;

[0115] The dynamic load test module 305 for the completed bridge is used to conduct dynamic load tests on the completed bridge structure using the pulsation method based on the natural frequency, collect vertical vibration response data, identify the measured natural frequency and compare it with the theoretical natural frequency to obtain the overall stiffness evaluation result.

[0116] The fusion evaluation output module 306 is used to perform multi-dimensional weighted fusion processing based on the strength and stiffness index, crack resistance index, and dynamic characteristic index corresponding to the static load test and the dynamic load test, to obtain the overall performance qualification judgment result and load-bearing status assessment report of the UHPC fully prefabricated assembled bridge.

[0117] The system also includes a memory and a processor. The memory includes a program for evaluating the overall performance of prefabricated bridges in conjunction with static and dynamic load tests. When the program for evaluating the overall performance of prefabricated bridges in conjunction with static and dynamic load tests is executed by the processor, it implements the steps of the method for evaluating the overall performance of prefabricated bridges in conjunction with static and dynamic load tests as described in any one of the first aspects.

[0118] This invention discloses a method and system for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests. The core of this method is to construct a scientific, complete, and operable performance evaluation system tailored to the structural characteristics of UHPC (Unified High-Pressure Construction) fully prefabricated bridges. First, based on the component parameters and structural system of the UHPC fully prefabricated bridge, a finite element model of the entire bridge is established. Combining the dimensions of prefabricated components, material mechanical parameters, boundary constraints, and combined load conditions, the model is used to calculate the internal force envelope and analyze natural vibration characteristics, thereby determining the static load control section, natural frequency, and test load, providing core parameter support for subsequent tests. After obtaining the test load, a correlation model between the test load and monitoring data is further established. This model is used to verify the consistency of data from static and dynamic load tests. Based on the verification results, the validity of the test data is marked and abnormal data is removed, ensuring the authenticity and reliability of the test data. Subsequently, based on the static load control section and the test load, on the one hand, positive and negative bending moment loading models were established for the precast UHPC bridge deck, and a graded load-bearing mode was adopted for load and displacement hybrid control to carry out static destructive tests and obtain data such as cracking load, peak load, mid-span deflection, and main crack width. On the other hand, for the UHPC precast U-beams and the main structure of the completed bridge, an equivalent design load graded application scheme was formulated, and loads were applied step by step while static load tests were carried out, and strain and deflection data of the control section were collected simultaneously. Based on the collected static load test data, systematic processing was performed, and after removing abnormal data, strain verification coefficients and deflection verification coefficients were obtained by comparing the measured values ​​with theoretical values, providing data support for performance evaluation. At the same time, based on the natural frequency, dynamic load tests were carried out on the completed bridge structure using the pulsation method to collect the raw data of vertical vibration response. After time-domain and frequency-domain processing and interference removal, the measured natural frequency was identified, and the overall stiffness evaluation result was obtained by comparing it with the theoretical natural frequency. Subsequently, according to the preset weighting configuration rules, the strength and stiffness indicators and crack resistance indicators corresponding to the static load test and the dynamic characteristic indicators corresponding to the dynamic load test are weighted and assigned, and normalization calculations are performed. Through multi-dimensional weighted fusion processing, the overall performance qualification judgment result and load-bearing status assessment report of the bridge are obtained. After generating the above results, the preset completion acceptance and operation and maintenance management classification rules are further matched to generate corresponding classification execution instructions. At the same time, a performance archive database of UHPC fully prefabricated assembled bridges is established. Combined with historical test data, bridge performance trend analysis and deterioration early warning calculations are carried out to generate long-term operation and maintenance monitoring suggestions and related data. The corresponding evaluation system includes a finite element modeling analysis module, a bridge deck destructive test module, a completed bridge static load test module, a parameter calculation module, a completed bridge dynamic load test module, and a fusion evaluation output module. It also includes a memory and a processor. The memory stores the program of the above evaluation method. The processor executes the program to realize all evaluation steps, which can effectively realize the accurate evaluation of the overall performance of UHPC fully prefabricated assembled bridges and provide a scientific basis for bridge completion acceptance and long-term operation and maintenance.

[0119] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0120] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units. They may be located in one place or distributed across multiple network units. Some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs.

[0121] In addition, in the various embodiments of the present invention, each functional unit can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0122] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various media that can store program code, such as mobile storage devices, read-only memory, random access memory, magnetic disks, or optical disks.

[0123] Alternatively, if the integrated units of this invention are implemented as software functional modules and sold or used as independent products, they can also be stored in a readable storage medium. Based on this understanding, the technical solutions of the embodiments of this invention, or the parts that contribute to the prior art, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROM, RAM, magnetic disks, or optical disks.

Claims

1. A method for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests, characterized in that: Includes the following steps: Based on the component parameters and structural system of the UHPC fully prefabricated assembled bridge, a finite element model of the entire bridge was established to obtain the static load control section, natural frequency and test load. Based on the static load control section and the test load, a static destructive test was carried out on the precast UHPC bridge deck. The load and displacement hybrid control mode was used for loading to obtain data on cracking load, peak load, mid-span deflection and main crack width. Based on the test load and static load control section, equivalent design loads were applied to the UHPC precast U-beam and the main structure of the completed bridge in stages, and static load tests were carried out to obtain strain and deflection data of the control section. Based on the strain and deflection data, strain and deflection verification coefficients are obtained; Based on the natural frequency, a dynamic load test was conducted on the bridge structure using the pulsation method. Vertical vibration response data was collected, the measured natural frequency was identified and compared with the theoretical natural frequency, and the overall stiffness evaluation result was obtained. Based on the strength and stiffness index and crack resistance index corresponding to the static load test and the dynamic characteristic index corresponding to the dynamic load test, a multi-dimensional weighted fusion process is performed to obtain the overall performance qualification judgment result and load-bearing status assessment report of the UHPC fully prefabricated assembled bridge.

2. The method for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests according to claim 1, characterized in that, Based on the component parameters and structural system of the UHPC fully prefabricated assembled bridge, a finite element model of the entire bridge was established to obtain the static load control section, natural frequency, and test load, specifically: Based on the component parameters and structural system of the UHPC fully prefabricated assembled bridge, a finite element model of the entire bridge was established. Based on the dimensions of the precast components, material mechanical parameters, boundary constraints, and combined load conditions, the internal force envelope calculation and natural vibration characteristic analysis are performed using the full-bridge finite element model. Based on the results of the internal force envelope calculation and natural vibration characteristic analysis, the static load control section, natural frequency, and test load are obtained.

3. The method for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests according to claim 1, characterized in that, The static destructive test was conducted on the precast UHPC bridge deck based on the static load control section and the test load. A mixed load and displacement control mode was used for loading to obtain data on cracking load, peak load, mid-span deflection, and main crack width. Specifically: Based on the static load control section and the test load, positive bending moment loading model and negative bending moment loading model are established for the precast UHPC bridge deck respectively. Based on the positive bending moment loading model and the negative bending moment loading model, a staged load-bearing loading is performed using a hybrid load and displacement control method. Based on the structural response data during the loading process, the cracking load, peak load, mid-span deflection, and main crack width data are obtained.

4. The method for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests according to claim 1, characterized in that, Based on the test load and the static load control section, equivalent design loads are applied in stages to the UHPC precast U-beams and the main structure of the completed bridge, and static load tests are conducted to obtain strain and deflection data of the control section. Specifically: Based on the test load and static load control section, determine the equivalent design load graded application scheme for the UHPC precast U-beam and the main structure of the completed bridge; According to the graded application scheme, equivalent design loads were applied to the UHPC precast U-beams and the main structure of the completed bridge step by step, and static load tests were carried out. Based on the structural monitoring signals during the static load test, the strain and deflection data of the control section are collected and obtained synchronously.

5. The method for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests according to claim 1, characterized in that, The strain and deflection verification coefficients are obtained based on the strain and deflection data, specifically as follows: Based on the strain and deflection data of the control section obtained from the static load test, data processing is performed in accordance with preset calculation rules; Based on the processed measured strain value and the theoretical value, the strain verification coefficient is obtained; The deflection verification coefficient is obtained based on the processed measured and theoretical deflection values.

6. The method for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests according to claim 1, characterized in that, Based on the natural frequency, a dynamic load test is conducted on the completed bridge structure using the pulsation method to collect vertical vibration response data and identify the measured natural frequency. Specifically: Based on the natural frequency, a dynamic load test was conducted on the completed bridge structure using the pulsation method to collect raw data on the vertical vibration response. The original vertical vibration response data is processed in the time domain and analyzed in the frequency domain to remove environmental interference data components. Based on the processed vibration response data, feature identification is performed to obtain the measured natural frequency of the bridge structure.

7. The method for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests according to claim 1, characterized in that, The process involves multi-dimensional weighted fusion processing of the strength and stiffness indices, crack resistance indices, and dynamic characteristic indices corresponding to static load tests and dynamic load tests to obtain the overall performance qualification judgment result and load-bearing state assessment report of the UHPC fully prefabricated assembled bridge. Specifically: According to the preset weighting configuration rules, the strength and stiffness index, crack resistance index and dynamic characteristic index are weighted and allocated. Normalization is performed based on the assigned weights and the data of each indicator. The overall performance qualification and load-bearing status assessment report of the UHPC fully prefabricated assembled bridge are obtained by comparing the calculation results with the preset judgment threshold.

8. The method for evaluating the overall performance of prefabricated bridges by combining static and dynamic load tests according to claim 7, characterized in that, After the overall performance qualification assessment result and load-bearing status evaluation report are generated, the following are also included: Based on the overall performance qualification assessment results and the load-bearing status assessment report, the preset completion acceptance and operation and maintenance management classification rules are matched. Based on the classification rules and the corresponding classification information of the judgment results, classification execution instructions for completion acceptance and operation and maintenance management are generated and output.

9. A prefabricated bridge overall performance evaluation system combining static and dynamic load tests, characterized in that: include: The finite element modeling and analysis module is used to establish a full bridge finite element model based on the component parameters and structural system of the UHPC fully prefabricated assembled bridge, and to obtain the static load control section, natural frequency and test load. The bridge deck destructive test module is used to conduct static destructive tests on the precast UHPC bridge deck according to the static load control section and the test load. The load and displacement hybrid control mode is used to obtain data on cracking load, peak load, mid-span deflection and main crack width. The static load test module for the completed bridge is used to apply equivalent design loads to the UHPC precast U-beams and the main structure of the completed bridge in stages according to the test load and static load control section, and to carry out static load tests to obtain strain and deflection data of the control section. The parameter calculation module is used to obtain strain and deflection verification coefficients based on the strain and deflection data; The dynamic load testing module for the completed bridge is used to conduct dynamic load tests on the completed bridge structure using the pulsation method based on the natural frequency, collect vertical vibration response data, identify the measured natural frequency and compare it with the theoretical natural frequency to obtain the overall stiffness evaluation result. The fusion evaluation output module is used to perform multi-dimensional weighted fusion processing based on the strength and stiffness index, crack resistance index, and dynamic characteristic index corresponding to the static load test and the dynamic load test, to obtain the overall performance qualification judgment result and load-bearing status assessment report of the UHPC fully prefabricated assembled bridge.

10. A prefabricated bridge overall performance evaluation system combining static and dynamic load tests, characterized in that: The system also includes a memory and a processor. The memory includes a program for evaluating the overall performance of prefabricated bridges in conjunction with static and dynamic load tests. When the program for evaluating the overall performance of prefabricated bridges in conjunction with static and dynamic load tests is executed by the processor, it implements the method for evaluating the overall performance of prefabricated bridges in conjunction with static and dynamic load tests as described in claims 1 to 8.

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