Method, system and equipment for testing combination degree of plate-truss composite beam and storage medium

Abstract

The invention discloses a method, system and equipment for testing the combination degree of a plate-truss combined beam and a storage medium, and relates to the technical field of bridge engineering, and the method specifically comprises the steps: constructing an experimental model and a theoretical model of a plate-truss combined cantilever beam, and determining the theoretical transverse stiffness of the plate-truss combined cantilever beam according to the theoretical model; carrying out a transverse loading test on the experimental model to obtain actual transverse rigidity; determining a second elastic modulus of the concrete in the experimental model based on the theoretical transverse stiffness, the actual transverse stiffness and the first elastic modulus of the concrete in the theoretical model; constructing a target influence curve based on the second elastic modulus, and determining the target vertical stiffness of the plate-truss combined cantilever beam in the theoretical model under the complete consolidation condition according to the target influence curve; performing a vertical loading test on the experimental model to obtain actual vertical rigidity; and determining a target combination degree based on the actual vertical stiffness and the target vertical stiffness. According to the invention, the precision of the combination degree test of the steel truss and the concrete bridge deck is improved.

Description

Technical Field

[0001] The present application relates to the field of bridge engineering technology, and in particular to a method, system, equipment and storage medium for testing the bonding degree of a plate-truss combined beam. Background Art

[0002] With the continuous development of bridge engineering, steel truss-concrete slab composite beam bridges, as a new structural form, have gradually gained widespread attention in practical applications. This bridge structure effectively leverages the mechanical properties of both steel and concrete through the synergistic load-bearing of the steel truss and the concrete deck. Currently, steel truss-concrete composite beam bridges offer significant advantages in long-span bridges, such as overpasses and curved bridges. They provide greater rigidity and stability while reducing steel usage, thereby lowering construction costs and improving bridge deck conditions.

[0003] Currently, the bond between steel trusses and concrete bridge decks is typically achieved through shear studs, allowing them to share the load, thereby leveraging the concrete's compressive strength and improving the overall structural stability and performance. In practice, the bond between the steel truss and concrete deck directly impacts the overall performance of the bridge. Insufficient bond can lead to localized slippage between the concrete slab and the steel truss, compromising the bridge's flexural stiffness and torsional resistance. Therefore, accurately assessing the bond between steel truss-concrete composite beams has become a crucial issue in bridge engineering.

[0004] Conventional methods for testing bond strength primarily rely on numerical simulation using finite element models, assessing the bond between the steel truss and concrete bridge deck by analyzing the stiffness changes between the two. However, relying solely on finite element models and stiffness changes to assess bond strength can lead to significant discrepancies between test results and actual conditions. Therefore, improving the accuracy of testing the bond strength between steel trusses and concrete bridge decks is an urgent issue. Summary of the Invention

[0005] The present application provides a method, system, equipment and storage medium for testing the bonding degree of a plate-truss combined beam, which can improve the accuracy of the bonding degree test between a steel truss and a concrete bridge deck.

[0006] In a first aspect, an embodiment of the present application provides a method for testing the bonding degree of a plate-truss combined beam, the method comprising: An experimental model and a theoretical model of the plate-truss combined with cantilever beam were constructed. The theoretical lateral stiffness of the plate-truss combined with cantilever beam was determined based on the theoretical model. A lateral loading test was then conducted on the experimental model to obtain the actual lateral stiffness. Determining a second elastic modulus of concrete in the experimental model based on the theoretical lateral stiffness, the actual lateral stiffness, and the first elastic modulus of concrete in the theoretical model; A target influence curve is constructed based on the second elastic modulus, the theoretical model, and the vertical spring stiffness coefficient, and a target vertical stiffness of the plate-truss combined cantilever beam in the theoretical model under fully consolidated conditions is determined based on the target influence curve. The target influence curve includes an influence relationship between the vertical spring stiffness coefficient and the theoretical vertical stiffness. The actual vertical stiffness is obtained by conducting vertical loading tests on the experimental model; A target degree of bonding is determined based on the actual vertical stiffness and the target vertical stiffness.

[0007] In conjunction with the first aspect, in one embodiment, determining the theoretical transverse stiffness of the plate truss combined with the cantilever beam according to the theoretical model includes: Applying a preset first transverse load to the concrete slab node on the free end side of the theoretical model to obtain a first theoretical model; After controlling the operation of the first theoretical model, the first lateral displacement of the concrete slab node on the other side of the free end is obtained; The theoretical lateral stiffness is determined based on the first lateral load, the first lateral displacement, and a preset total length of the plate-truss combined beam specimen.

[0008] In conjunction with the first aspect, in one embodiment, determining the theoretical lateral stiffness based on the first lateral load, the first lateral displacement, and a preset total length of the plate-truss combined beam specimen includes: Substituting the first transverse load, the first transverse displacement, and the preset total length of the plate-truss combined beam specimen into a first calculation formula to obtain the theoretical transverse stiffness, the first calculation formula is as follows:

[0009] Where, is the first lateral load; is the first lateral displacement; is the total length of the preset plate-truss composite beam specimen; is the theoretical lateral stiffness.

[0010] In conjunction with the first aspect, in one embodiment, performing a transverse loading test on the experimental model to obtain the actual transverse stiffness includes: Applying a preset second transverse load to the free end of the experimental model to perform a transverse loading test and measuring a second transverse displacement corresponding to each second transverse load; constructing a load-displacement curve based on the second lateral load and the second lateral displacement; The load-displacement curve is fitted to obtain the slope of the curve, and the actual lateral stiffness is determined based on the slope of the curve and the preset total length of the plate-truss combined beam specimen.

[0011] In combination with the first aspect, in one embodiment, determining the second elastic modulus of concrete in the experimental model based on the theoretical lateral stiffness, the actual lateral stiffness, and the first elastic modulus of concrete in the theoretical model includes: Correcting the first elastic modulus to adjust the theoretical lateral stiffness until the theoretical lateral stiffness is equal to the actual lateral stiffness, thereby obtaining a corrected elastic modulus; The corrected elastic modulus is referred to as the second elastic modulus.

[0012] In conjunction with the first aspect, in one embodiment, constructing the target influence curve based on the second elastic modulus, the theoretical model, and the vertical spring stiffness coefficient includes: inputting the second elastic modulus into a theoretical model to obtain a second theoretical model; The vertical spring stiffness coefficient between the concrete slab and the steel truss in the second theoretical model was adjusted to obtain the theoretical vertical stiffness of the slab-truss combined cantilever beam under different vertical spring stiffness coefficients. The target influence curve is constructed based on the vertical spring stiffness coefficient and the theoretical vertical stiffness.

[0013] In combination with the first aspect, in one embodiment, determining the target bonding degree based on the actual vertical stiffness and the target vertical stiffness includes: The actual vertical stiffness and the target vertical stiffness are substituted into a second calculation formula to obtain a target bonding degree. The second calculation formula is as follows:

[0014] Where, is the target binding degree; is the actual vertical stiffness; is the target vertical stiffness.

[0015] In a second aspect, an embodiment of the present application provides a system for testing the bonding strength of a plate-truss combined beam, the system comprising: The first processing module is used to construct an experimental model and a theoretical model of the plate-truss combined cantilever beam, determine the theoretical lateral stiffness of the plate-truss combined cantilever beam based on the theoretical model, and perform a lateral loading test on the experimental model to obtain the actual lateral stiffness; a second processing module, configured to determine a second elastic modulus of concrete in the experimental model based on the theoretical lateral stiffness, the actual lateral stiffness, and the first elastic modulus of concrete in the theoretical model; a third processing module for constructing a target influence curve based on the second elastic modulus, the theoretical model, and the vertical spring stiffness coefficient, and determining a target vertical stiffness of the plate-truss combined cantilever beam in the theoretical model under fully consolidated conditions based on the target influence curve, wherein the target influence curve includes an influence relationship between the vertical spring stiffness coefficient and the theoretical vertical stiffness; a fourth processing module, which is used to perform a vertical loading test on the experimental model to obtain an actual vertical stiffness; A fifth processing module is configured to determine a target bonding degree based on the actual vertical stiffness and the target vertical stiffness.

[0016] In a third aspect, an embodiment of the present application provides a test device for the bonding degree of a plate-truss combined beam, wherein the test device for the bonding degree of a plate-truss combined beam comprises a processor, a memory, and a test program for the bonding degree of a plate-truss combined beam stored in the memory and executable by the processor, wherein when the test program for the bonding degree of a plate-truss combined beam is executed by the processor, the steps of the test method for the bonding degree of a plate-truss combined beam as described in any of the aforementioned items are implemented.

[0017] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a test program for the bonding degree of plate-truss combined beams is stored. When the test program for the bonding degree of plate-truss combined beams is executed by a processor, the steps of the method for testing the bonding degree of plate-truss combined beams as described in any of the above items are implemented.

[0018] The beneficial effects of the technical solutions provided in the embodiments of the present application include: By constructing an experimental model and a theoretical model of a plate-truss combined with a cantilever beam, the theoretical lateral stiffness of the plate-truss combined with a cantilever beam is determined according to the theoretical model, and a lateral loading test is performed on the experimental model to obtain the actual lateral stiffness; based on the theoretical lateral stiffness, the actual lateral stiffness and the first elastic modulus of the concrete in the theoretical model, the second elastic modulus of the concrete in the experimental model is determined, so as to more accurately reflect the stress condition of the concrete; based on the second elastic modulus, the theoretical model and the vertical spring stiffness coefficient, a target influence curve is constructed, and based on the target influence curve, the target vertical stiffness of the plate-truss combined with a cantilever beam in the theoretical model under fully consolidated conditions is determined, and the target influence curve includes the influence relationship between the vertical spring stiffness coefficient and the theoretical vertical stiffness; a vertical loading test is performed on the experimental model to obtain the actual vertical stiffness; and the target bonding degree is determined based on the actual vertical stiffness and the target vertical stiffness. This application combines experimental models with theoretical models for analysis, taking into account the impact of errors in steel trusses and concrete slabs under actual working conditions on their bonding, eliminating the deviations that may be caused by relying solely on finite element analysis, and improving the test accuracy of the bonding between steel trusses and concrete bridge decks. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a flow chart of an embodiment of a method for testing the bonding strength of a plate-truss combined beam of the present application; Figure 2 Schematic diagram of the theoretical model of the plate-truss composite beam for testing the bonding strength of the plate-truss composite beam in this application; Figure 3 Schematic diagram of the influence curve between the vertical spring stiffness coefficient and the lateral stiffness in this application; Figure 4 Schematic diagram of the influence curve between the vertical spring stiffness coefficient and the vertical stiffness in this application; Figure 5 is a schematic diagram of the load-displacement curve corresponding to the vertical loading test of the experimental model in this application; Figure 6 is a schematic diagram of the load-displacement curve corresponding to the lateral loading test of the experimental model in this application; Figure 7 This is a schematic diagram of the functional modules of an embodiment of a system for testing the bonding strength of a plate-truss combined beam of the present application; Figure 8 This is a schematic diagram of the hardware structure of the testing equipment for the bonding degree of plate-truss combined beams involved in the embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0022] In a first aspect, an embodiment of the present application provides a method for testing the bonding degree of a plate-truss combined beam.

[0023] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of an embodiment of a method for testing the bonding strength of a plate-truss combined beam of this application. Figure 1 As shown in the figure, the test methods for the bond strength of plate-truss composite beams include: Step S10: constructing an experimental model and a theoretical model of the plate-truss combined with the cantilever beam, determining the theoretical lateral stiffness of the plate-truss combined with the cantilever beam according to the theoretical model, and performing a lateral loading test on the experimental model to obtain the actual lateral stiffness.

[0024] For example, in the embodiment of the present application, an experimental model of a plate-truss combined cantilever beam can be constructed according to the design drawings of the actual plate-truss combined beam and the structural dimensions and material parameters. The experimental model adopts a support form in which one end is fixed and the other end is cantilevered. Figure 2 As shown in the figure, finite element modeling can be performed based on professional bridge analysis software such as MIDAS / CIVIL to obtain a theoretical model (i.e., numerical model) of the plate-truss combined with the cantilever beam. It should be noted that the structural dimensions and material parameters of the numerical model should be consistent with the experimental model. When setting the boundary conditions, a fully consolidated constraint should be applied to the steel truss node at the cantilever end, and the load should be applied to the concrete node at the free end. In addition, an elastic connection can be used between the concrete slab and the steel truss beam.

[0025] Specifically, after the experimental model and theoretical model are constructed, a transverse load is applied to the theoretical model to obtain a new theoretical model. The transverse load acts on the concrete slab node on one side of the free end. The transverse displacement of the concrete slab node on the other side of the free end in the new theoretical model is obtained, and the theoretical transverse stiffness is calculated by combining the known transverse load, transverse displacement, and total length of the plate-truss combined beam specimen. It can be understood that the actual transverse stiffness is obtained through transverse loading tests, which take into account factors such as the actual mechanical behavior of the material and the actual stress state of the structure. Specifically, multiple transverse loads and transverse displacements can be obtained by conducting transverse loading tests on the experimental model. A load-displacement curve is drawn based on each transverse load and its corresponding transverse displacement, and the slope of the load-displacement curve is determined by a fitting algorithm. The actual transverse stiffness is calculated by combining the known slope of the curve and the total length of the plate-truss combined beam specimen, providing a basis for further optimization of the model or experimental design.

[0026] It should be noted that the theoretical lateral stiffness under different vertical spring stiffness coefficients can also be obtained by adjusting the vertical spring stiffness coefficient; and then a curve is drawn with the vertical spring stiffness coefficient as the abscissa and the theoretical lateral stiffness as the ordinate, such as Figure 3 As shown in , a curve containing the influence relationship between the vertical stiffness coefficient and the theoretical lateral stiffness can be obtained; from this curve, it can be seen that no matter how the vertical spring stiffness coefficient is adjusted, the corresponding lateral stiffness remains basically unchanged. Therefore, the influence of the vertical spring stiffness coefficient on the lateral stiffness can be ignored, that is, when determining the bonding degree of the plate-truss composite beam, it is only necessary to study the influence of the vertical spring stiffness coefficient on the vertical stiffness.

[0027] Step S20: Determine a second elastic modulus of concrete in the experimental model based on the theoretical lateral stiffness, the actual lateral stiffness, and the first elastic modulus of concrete in the theoretical model.

[0028] For example, in the embodiment of the present application, the specific value of the first elastic modulus of concrete in the theoretical model can be determined by standard test methods such as compression tests, which are not limited here; specifically, the first elastic modulus is one of the key parameters affecting the theoretical lateral stiffness. Since the second elastic modulus of concrete may be different from the theoretical first elastic modulus in actual engineering, it is necessary to continuously correct the first elastic modulus of concrete in the theoretical model so that the stiffness calculated in the theoretical model is consistent with the stiffness measured experimentally (that is, the theoretical lateral stiffness is equal to the actual lateral stiffness). In this case, the first elastic modulus is the second elastic modulus.

[0029] Step S30: Constructing a target influence curve based on the second elastic modulus, the theoretical model, and the vertical spring stiffness coefficient, and determining the target vertical stiffness of the plate truss combined with the cantilever beam in the theoretical model under fully consolidated conditions according to the target influence curve, wherein the target influence curve includes the influence relationship between the vertical spring stiffness coefficient and the theoretical vertical stiffness.

[0030] Exemplarily, in an embodiment of the present application, the target influence curve includes the influence relationship between the vertical spring stiffness coefficient and the theoretical vertical stiffness, and the vertical spring stiffness coefficient refers to the stiffness coefficient corresponding to the spring of the vertical elastic connection between the concrete slab and the steel truss; a new theoretical model can be obtained by inputting the second elastic modulus into the theoretical model, that is, the influence of the second elastic modulus on the vertical spring stiffness coefficient is taken into account; in the new theoretical model, the vertical spring stiffness coefficient is continuously modified to obtain the theoretical vertical stiffness under different vertical spring stiffness coefficients, and then the target influence curve is drawn according to each vertical spring stiffness coefficient and its corresponding theoretical stiffness coefficient; wherein, since it is difficult to simulate the completely consolidated condition (that is, the ideal state) in actual experiments, the theoretical model can be used to simulate the completely consolidated state to obtain the target vertical stiffness; specifically, after obtaining the target influence curve, it can be referred to Figure 4 As shown in the figure, the change of the vertical spring stiffness coefficient between the concrete slab and the steel truss in the theoretical model has a greater impact on the theoretical vertical stiffness, and when the vertical spring stiffness coefficient gradually increases, the theoretical vertical stiffness gradually approaches a certain value, which can be defined as the vertical stiffness of the plate-truss combined cantilever beam of the theoretical model under fully consolidated conditions. (i.e., target vertical stiffness). It should be understood that the above process considers the influence of the second elastic modulus and utilizes structural mechanics analysis methods to solve the theoretical vertical stiffness for different spring stiffness coefficients. A target influence curve of the theoretical vertical stiffness and spring stiffness coefficient is then plotted. This target influence curve is then used to accurately determine the target vertical stiffness of the plate-truss combined cantilever beam in the theoretical model under fully consolidated conditions.

[0031] Step S40: Perform a vertical loading test on the experimental model to obtain the actual vertical stiffness.

[0032] For example, in the embodiment of the present application, the specific value of the total length of the preset plate-truss combined beam specimen can be determined according to actual needs and is not limited here. For example, the total length of the preset plate-truss combined beam specimen is preferably 3m. Specifically, a plurality of vertical loads can be obtained by performing a vertical loading test on the free end of the experimental model, as shown in Table 1, and then the vertical displacement corresponding to each vertical load is measured respectively; Figure 5 As shown in Figure 2, the load-displacement curve is drawn with vertical load as the ordinate and vertical displacement as the abscissa.

[0033] Table 1 Vertical load and its corresponding vertical displacement

[0034] As shown in Table 1, when the vertical load is 20kN, the corresponding vertical displacement is 2.2mm; when the vertical load is 40kN, the corresponding vertical displacement is 4.3mm. It should be noted that the above is only a presentation of an embodiment, and the vertical load and vertical displacement can be adaptively adjusted according to actual needs.

[0035] The load-displacement curve can be fitted according to the least squares method to obtain the slope of the curve. The actual vertical stiffness of the plate-truss combined cantilever beam in the experimental model can be determined based on the slope of the curve and the preset total length of the plate-truss combined beam specimen. The calculation formula is as follows:

[0036] Where, is the actual vertical stiffness; is the slope of the curve; is the total length of the plate-truss composite beam specimen.

[0037] It should be noted that the numerical value of the bond strength of the plate-truss composite beam is mainly related to factors such as the size of the component, the elastic modulus of concrete, the elastic modulus of the steel truss, and the vertical stiffness between the steel truss and the concrete slab. During component production, the size of the component and the elastic modulus of the steel truss can usually meet the calculation accuracy. However, there may be large errors in the elastic modulus of concrete and the vertical stiffness between the steel truss and the concrete slab. Among them, the elastic modulus of concrete can be obtained based on the analysis of the lateral loading test data of the experimental model. Therefore, the elastic modulus of concrete in the theoretical model can be modified to the elastic modulus of concrete in the experimental model. At this time, the bond strength of the plate-truss composite beam is only related to the vertical stiffness between the steel truss and the concrete slab. Therefore, when the theoretical vertical stiffness calculated by the theoretical model is equal to the actual vertical stiffness obtained by the experimental model, the vertical spring stiffness coefficient between the concrete slab and the steel truss in the theoretical model is the vertical stiffness coefficient between the concrete slab and the steel truss in the experimental model.

[0038] Step S50: Determine a target bonding degree based on the actual vertical stiffness and the target vertical stiffness.

[0039] For example, in the embodiment of the present application, the target bonding degree is used in structural analysis to measure the degree of cooperation between the steel truss beam and the concrete slab, reflecting the interaction efficiency of the two when they jointly bear external loads. The level of the target bonding degree directly affects the overall stiffness, deformation and strength characteristics of the plate-truss combined beam.

[0040] Specifically, the target degree of bonding can be determined by calculating the ratio between the actual vertical stiffness and the target vertical stiffness, thereby improving the accuracy of the target degree of bonding calculation. It should be noted that the above process predicts the vertical stiffness under the "ideal" state (i.e., the target vertical stiffness) through a theoretical model, and then calculates the ratio of the target vertical stiffness to the actual vertical stiffness to obtain the target degree of bonding, which can better reflect the actual collaborative working conditions of the concrete slab and the steel truss, and thus provide a theoretical basis for optimizing structural design.

[0041] The present application constructs an experimental model and a theoretical model of a plate-truss combined cantilever beam, determines the theoretical lateral stiffness of the plate-truss combined cantilever beam according to the theoretical model, and performs a lateral loading test on the experimental model to obtain the actual lateral stiffness; determines the second elastic modulus of concrete in the experimental model based on the theoretical lateral stiffness, the actual lateral stiffness and the first elastic modulus of concrete in the theoretical model, thereby more accurately reflecting the stress condition of the concrete; constructs a target influence curve based on the second elastic modulus, the theoretical model and the vertical spring stiffness coefficient, and determines the target vertical stiffness of the plate-truss combined cantilever beam in the theoretical model under fully consolidated conditions according to the target influence curve, wherein the target influence curve includes the influence relationship between the vertical spring stiffness coefficient and the theoretical vertical stiffness; performs a vertical loading test on the experimental model to obtain the actual vertical stiffness; and determines the target bonding degree based on the actual vertical stiffness and the target vertical stiffness. This application combines experimental models with theoretical models for analysis, taking into account the impact of errors in steel trusses and concrete slabs under actual working conditions on their bonding, eliminating the deviations that may be caused by relying solely on finite element analysis, and improving the test accuracy of the bonding between steel trusses and concrete bridge decks.

[0042] Furthermore, in one embodiment, determining the theoretical transverse stiffness of the plate truss combined with the cantilever beam according to the theoretical model includes: Applying a preset first transverse load to the concrete slab node on the free end side of the theoretical model to obtain a first theoretical model; After controlling the operation of the first theoretical model, the first lateral displacement of the concrete slab node on the other side of the free end is obtained; The theoretical lateral stiffness is determined based on the first lateral load, the first lateral displacement, and a preset total length of the plate-truss combined beam specimen.

[0043] For example, in the embodiment of the present application, the specific value of the preset first lateral load can be determined according to actual needs and is not limited here; specifically, a preset first lateral load can be applied to the concrete slab node on the free end side of the theoretical model to construct a preliminary calculation model, and generate a first theoretical model based on the load; then, the operation of the first theoretical model is controlled, and the first lateral displacement of the concrete slab node on the other side of the free end is obtained by analyzing the deformation after the first lateral load; the lateral stiffness can be obtained by comprehensively considering the relationship between the load, displacement and geometric parameters, that is, the theoretical lateral stiffness is further calculated based on the first lateral load, the first lateral displacement and the total length of the preset plate-truss combined beam specimen.

[0044] Furthermore, in one embodiment, determining the theoretical lateral stiffness based on the first lateral load, the first lateral displacement, and a preset total length of the plate-truss combined beam specimen includes: Substituting the first transverse load, the first transverse displacement, and the preset total length of the plate-truss combined beam specimen into a first calculation formula to obtain the theoretical transverse stiffness, the first calculation formula is as follows:

[0045] Where, is the first lateral load; is the first lateral displacement; is the total length of the preset plate-truss composite beam specimen; is the theoretical lateral stiffness.

[0046] Exemplarily, in the embodiment of the present application, the first lateral load , the first transverse displacement and the total length of the preset plate-truss composite beam specimen Substitute the following calculation formula to obtain the theoretical lateral stiffness , the calculation formula is as follows: .

[0047] Furthermore, in one embodiment, performing a lateral loading test on the experimental model to obtain the actual lateral stiffness includes: Applying a preset second transverse load to the free end of the experimental model to perform a transverse loading test and measuring a second transverse displacement corresponding to each second transverse load; constructing a load-displacement curve based on the second lateral load and the second lateral displacement; The load-displacement curve is fitted to obtain the slope of the curve, and the actual lateral stiffness is determined based on the slope of the curve and the preset total length of the plate-truss combined beam specimen.

[0048] For example, in the embodiment of the present application, the specific value of the preset second lateral load can be determined according to actual needs and is not limited here. Specifically, when conducting the lateral loading test, the preset second lateral load can be applied to the free end of the test model, as shown in Table 2, and the second lateral displacement corresponding to each second lateral load can be gradually measured to ensure that the data between the load and the displacement are accurately recorded. Then, a load-displacement curve is constructed with the second lateral load as the ordinate and the second lateral displacement as the abscissa, as shown in Table 2. Figure 6 As shown in Figure 2, this curve can reflect the deformation response of the plate-truss composite beam under different loads.

[0049] Table 2 Second lateral load and its corresponding second lateral displacement

[0050] As shown in Table 2, when the second lateral load is 100 kN, the corresponding second lateral displacement is 0.8 mm; when the second lateral load is 200 kN, the corresponding second lateral displacement is 1.5 mm. It should be noted that the above is only an example, and the second lateral load and second lateral displacement can be adaptively adjusted according to actual needs.

[0051] The load-displacement curve can be fitted using the least squares method to determine the slope of the curve. This slope reflects the stiffness relationship between load and displacement, i.e., the stiffness characteristics of the plate-truss composite beam. The actual lateral stiffness is then calculated based on the fitted slope and the preset total length of the plate-truss composite beam specimen. It should be understood that this process utilizes mechanical principles, combines experimental data, and a fitting algorithm to accurately assess the lateral stiffness of the plate-truss composite beam.

[0052] Furthermore, in one embodiment, determining the second elastic modulus of concrete in the experimental model based on the theoretical lateral stiffness, the actual lateral stiffness, and the first elastic modulus of concrete in the theoretical model includes: Correcting the first elastic modulus to adjust the theoretical lateral stiffness until the theoretical lateral stiffness is equal to the actual lateral stiffness, thereby obtaining a corrected elastic modulus; The corrected elastic modulus is referred to as the second elastic modulus.

[0053] For example, in the embodiment of the present application, the first elastic modulus is corrected, and the theoretical lateral stiffness is changed by adjusting its value. The goal of this process is to make the theoretical lateral stiffness equal to the actual lateral stiffness, thereby ensuring the consistency between the theoretical model and the actual engineering situation. During the correction process, the first elastic modulus can be continuously adjusted according to the actual measured lateral stiffness data until the theoretical lateral stiffness is equal to the actual lateral stiffness. At this time, the corrected elastic modulus can be obtained and used as the second elastic modulus. This corrected value can more accurately reflect the actual elastic characteristics of the structure and be used for subsequent engineering analysis and design optimization. It should be noted that, assuming that the actual lateral stiffness calculated is 1.0663×10 16 MPa, the theoretical lateral stiffness is adjusted by continuously correcting the first elastic modulus. When the theoretical lateral stiffness is adjusted to 1.0663×10 16 MPa (i.e., the theoretical lateral stiffness is equal to the actual lateral stiffness at this time), the first elastic modulus at this time is 32000 MPa (i.e., the corrected elastic modulus). Therefore, the corrected elastic modulus 32000 MPa can be used as the second elastic modulus, i.e., the second elastic modulus is 32000 MPa.

[0054] Furthermore, in one embodiment, constructing the target influence curve based on the second elastic modulus, the theoretical model, and the vertical spring stiffness coefficient includes: inputting the second elastic modulus into a theoretical model to obtain a second theoretical model; The vertical spring stiffness coefficient between the concrete slab and the steel truss in the second theoretical model was adjusted to obtain the theoretical vertical stiffness of the slab-truss combined cantilever beam under different vertical spring stiffness coefficients. The target influence curve is constructed based on the vertical spring stiffness coefficient and the theoretical vertical stiffness.

[0055] Exemplarily, in the embodiment of the present application, the vertical spring stiffness coefficient is a parameter that reflects the vertical force transmission capacity of the plate-truss joint, and its change will affect the vertical stiffness of the entire structure; the theoretical vertical stiffness changes with the change of the vertical spring stiffness coefficient, and can reflect the vertical deformation characteristics of the structure under different stiffness conditions. Specifically, after obtaining the second elastic modulus corresponding to the experimental model, it is input into the theoretical model, so that a second theoretical model based on the corrected elastic modulus can be obtained, which can more accurately reflect the actual elastic characteristics of the material; in the second theoretical model, by continuously adjusting the vertical spring stiffness coefficient, the theoretical vertical stiffness of the plate-truss combined with the cantilever beam under different vertical spring stiffness coefficients can be calculated respectively, with reference to Figure 4As shown in the figure, the target influence curve is constructed with the vertical spring stiffness coefficient as the horizontal coordinate and the theoretical vertical stiffness as the vertical coordinate. This curve shows the influence trend of the vertical spring stiffness coefficient on the vertical stiffness, and thus provides a quantitative basis for optimizing structural design.

[0056] Furthermore, in one embodiment, determining the target bonding degree based on the actual vertical stiffness and the target vertical stiffness includes: The actual vertical stiffness and the target vertical stiffness are substituted into a second calculation formula to obtain a target bonding degree. The second calculation formula is as follows:

[0057] Where, is the target binding degree; is the actual vertical stiffness; is the target vertical stiffness.

[0058] For example, in the embodiment of the present application, the actual vertical stiffness and target vertical stiffness Substitute the following calculation formula to obtain the target binding degree , the calculation formula is as follows: .

[0059] In a second aspect, an embodiment of the present application also provides a system for testing the bonding degree of a plate-truss combined beam.

[0060] In one embodiment, referring to Figure 7 , Figure 7 This is a functional module diagram of an embodiment of a test system for the bonding degree of plate-truss combined beams of this application. Figure 7 As shown in the figure, the test system for the bond strength of plate-truss composite beams includes: The first processing module is used to construct an experimental model and a theoretical model of the plate-truss combined cantilever beam, determine the theoretical lateral stiffness of the plate-truss combined cantilever beam based on the theoretical model, and perform a lateral loading test on the experimental model to obtain the actual lateral stiffness; a second processing module, configured to determine a second elastic modulus of concrete in the experimental model based on the theoretical lateral stiffness, the actual lateral stiffness, and the first elastic modulus of concrete in the theoretical model; a third processing module for constructing a target influence curve based on the second elastic modulus, the theoretical model, and the vertical spring stiffness coefficient, and determining a target vertical stiffness of the plate-truss combined cantilever beam in the theoretical model under fully consolidated conditions based on the target influence curve, wherein the target influence curve includes an influence relationship between the vertical spring stiffness coefficient and the theoretical vertical stiffness; a fourth processing module, which is used to perform a vertical loading test on the experimental model to obtain an actual vertical stiffness; A fifth processing module is configured to determine a target bonding degree based on the actual vertical stiffness and the target vertical stiffness.

[0061] Furthermore, in one embodiment, the first processing module is specifically configured to: Applying a preset first transverse load to the concrete slab node on the free end side of the theoretical model to obtain a first theoretical model; After controlling the operation of the first theoretical model, the first lateral displacement of the concrete slab node on the other side of the free end is obtained; The theoretical lateral stiffness is determined based on the first lateral load, the first lateral displacement, and a preset total length of the plate-truss combined beam specimen.

[0062] Furthermore, in one embodiment, the first processing module is further configured to: Substituting the first transverse load, the first transverse displacement, and the preset total length of the plate-truss combined beam specimen into a first calculation formula to obtain the theoretical transverse stiffness, the first calculation formula is as follows:

[0063] Where, is the first lateral load; is the first lateral displacement; is the total length of the preset plate-truss composite beam specimen; is the theoretical lateral stiffness.

[0064] Furthermore, in one embodiment, the first processing module is further configured to: Applying a preset second transverse load to the free end of the experimental model to perform a transverse loading test and measuring a second transverse displacement corresponding to each second transverse load; constructing a load-displacement curve based on the second lateral load and the second lateral displacement; The load-displacement curve is fitted to obtain the slope of the curve, and the actual lateral stiffness is determined based on the slope of the curve and the preset total length of the plate-truss combined beam specimen.

[0065] Furthermore, in one embodiment, the second processing module is specifically configured to: Correcting the first elastic modulus to adjust the theoretical lateral stiffness until the theoretical lateral stiffness is equal to the actual lateral stiffness, thereby obtaining a corrected elastic modulus; The corrected elastic modulus is referred to as the second elastic modulus.

[0066] Furthermore, in one embodiment, the third processing module is specifically configured to: inputting the second elastic modulus into a theoretical model to obtain a second theoretical model; The vertical spring stiffness coefficient between the concrete slab and the steel truss in the second theoretical model was adjusted to obtain the theoretical vertical stiffness of the slab-truss combined cantilever beam under different vertical spring stiffness coefficients. The target influence curve is constructed based on the vertical spring stiffness coefficient and the theoretical vertical stiffness.

[0067] Furthermore, in one embodiment, the fifth processing module is specifically configured to: The actual vertical stiffness and the target vertical stiffness are substituted into a second calculation formula to obtain a target bonding degree. The second calculation formula is as follows:

[0068] Where, is the target binding degree; is the actual vertical stiffness; is the target vertical stiffness.

[0069] The present application constructs an experimental model and a theoretical model of a plate-truss combined cantilever beam, determines the theoretical lateral stiffness of the plate-truss combined cantilever beam according to the theoretical model, and performs a lateral loading test on the experimental model to obtain the actual lateral stiffness; determines the second elastic modulus of concrete in the experimental model based on the theoretical lateral stiffness, the actual lateral stiffness and the first elastic modulus of concrete in the theoretical model, thereby more accurately reflecting the stress condition of the concrete; constructs a target influence curve based on the second elastic modulus, the theoretical model and the vertical spring stiffness coefficient, and determines the target vertical stiffness of the plate-truss combined cantilever beam in the theoretical model under fully consolidated conditions according to the target influence curve, wherein the target influence curve includes the influence relationship between the vertical spring stiffness coefficient and the theoretical vertical stiffness; performs a vertical loading test on the experimental model to obtain the actual vertical stiffness; and determines the target bonding degree based on the actual vertical stiffness and the target vertical stiffness. This application combines experimental models with theoretical models for analysis, taking into account the impact of errors in steel trusses and concrete slabs under actual working conditions on their bonding, eliminating the deviations that may be caused by relying solely on finite element analysis, and improving the test accuracy of the bonding between steel trusses and concrete bridge decks.

[0070] Among them, the functional implementation of each module in the above-mentioned plate-truss combined beam bonding test system corresponds to the various steps in the above-mentioned plate-truss combined beam bonding test method embodiment, and its functions and implementation processes are no longer repeated here.

[0071] In a third aspect, an embodiment of the present application provides a device for testing the bonding degree of a plate-truss combined beam. The device for testing the bonding degree of a plate-truss combined beam may be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0072] Reference Figure 8 , Figure 8 Schematic diagram of the hardware structure of the plate-truss combined beam bonding test device involved in the embodiment of the present application. In the embodiment of the present application, the plate-truss combined beam bonding test device may include a processor, a memory, a communication interface, and a communication bus.

[0073] The communication bus may be of any type and is used to interconnect the processor, memory, and communication interface.

[0074] Communication interfaces include input / output (I / O), physical, and logical interfaces, which interconnect components within the plate-truss composite beam bonding test equipment and other devices (such as other computing devices or user equipment). Physical interfaces can include Ethernet, fiber optic, and ATM interfaces; user equipment can include displays and keyboards.

[0075] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0076] The processor may be a general-purpose processor that can invoke a plate-truss composite beam bond test program stored in memory and execute the plate-truss composite beam bond test method provided in the embodiments of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the plate-truss composite beam bond test program is invoked can be referenced to the various embodiments of the plate-truss composite beam bond test method of the present application and will not be further described here.

[0077] Those skilled in the art will understand that Figure 8 The hardware structure shown in the figure does not constitute a limitation to the present application and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0078] In a fourth aspect, an embodiment of the present application also provides a readable storage medium.

[0079] The readable storage medium of the present application stores a test program for the bonding degree of plate-truss combined beams, wherein when the test program for the bonding degree of plate-truss combined beams is executed by a processor, the steps of the test method for the bonding degree of plate-truss combined beams as described above are implemented.

[0080] Among them, the method implemented when the test program for the bonding degree of plate-truss combined beams is executed can refer to the various embodiments of the test method for the bonding degree of plate-truss combined beams in this application, and will not be repeated here.

[0081] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0082] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0083] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0084] In some processes described in the embodiments of the present application, multiple operations or steps are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined.

[0085] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0086] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, or the part that contributes to the existing technology, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above and includes a number of instructions for enabling a terminal device to execute the methods described in each embodiment of this application.

[0087] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for testing the bonding strength of a plate-truss combined beam, characterized in that: The test method for the bonding degree of the plate-truss combined beam includes: An experimental model and a theoretical model of the plate-truss combined with cantilever beam were constructed. The theoretical lateral stiffness of the plate-truss combined with cantilever beam was determined based on the theoretical model. A lateral loading test was then conducted on the experimental model to obtain the actual lateral stiffness. Determining a second elastic modulus of concrete in the experimental model based on the theoretical lateral stiffness, the actual lateral stiffness, and the first elastic modulus of concrete in the theoretical model; A target influence curve is constructed based on the second elastic modulus, the theoretical model, and the vertical spring stiffness coefficient, and a target vertical stiffness of the plate-truss combined cantilever beam in the theoretical model under fully consolidated conditions is determined based on the target influence curve. The target influence curve includes an influence relationship between the vertical spring stiffness coefficient and the theoretical vertical stiffness. The actual vertical stiffness is obtained by conducting vertical loading tests on the experimental model; A target degree of bonding is determined based on the actual vertical stiffness and the target vertical stiffness.

2. The method for testing the bonding strength of a plate-truss combined beam according to claim 1, wherein: Determining the theoretical transverse stiffness of the plate truss combined with the cantilever beam according to the theoretical model includes: Applying a preset first transverse load to the concrete slab node on the free end side of the theoretical model to obtain a first theoretical model; After controlling the operation of the first theoretical model, the first lateral displacement of the concrete slab node on the other side of the free end is obtained; The theoretical lateral stiffness is determined based on the first lateral load, the first lateral displacement, and a preset total length of the plate-truss combined beam specimen.

3. The method for testing the bonding strength of a plate-truss combined beam according to claim 2, wherein: The determining of the theoretical lateral stiffness based on the first lateral load, the first lateral displacement, and a preset total length of the plate-truss combined beam specimen includes: Substituting the first transverse load, the first transverse displacement, and the preset total length of the plate-truss combined beam specimen into a first calculation formula to obtain the theoretical transverse stiffness, the first calculation formula is as follows: Where, is the first lateral load; is the first lateral displacement; is the total length of the preset plate-truss composite beam specimen; is the theoretical lateral stiffness.

4. The method for testing the bonding strength of a plate-truss combined beam according to claim 1, wherein: The performing of a lateral loading test on the experimental model to obtain actual lateral stiffness includes: Applying a preset second transverse load to the free end of the experimental model to perform a transverse loading test and measuring a second transverse displacement corresponding to each second transverse load; constructing a load-displacement curve based on the second lateral load and the second lateral displacement; The load-displacement curve is fitted to obtain the slope of the curve, and the actual lateral stiffness is determined based on the slope of the curve and the preset total length of the plate-truss combined beam specimen.

5. The method for testing the bonding strength of a plate-truss combined beam according to claim 1, wherein: The determining of the second elastic modulus of concrete in the experimental model based on the theoretical lateral stiffness, the actual lateral stiffness, and the first elastic modulus of concrete in the theoretical model includes: Correcting the first elastic modulus to adjust the theoretical lateral stiffness until the theoretical lateral stiffness is equal to the actual lateral stiffness, thereby obtaining a corrected elastic modulus; The corrected elastic modulus is referred to as the second elastic modulus.

6. The method for testing the bonding strength of a plate-truss combined beam according to claim 1, wherein: The constructing of the target influence curve based on the second elastic modulus, the theoretical model and the vertical spring stiffness coefficient includes: inputting the second elastic modulus into a theoretical model to obtain a second theoretical model; The vertical spring stiffness coefficient between the concrete slab and the steel truss in the second theoretical model was adjusted to obtain the theoretical vertical stiffness of the slab-truss combined cantilever beam under different vertical spring stiffness coefficients. The target influence curve is constructed based on the vertical spring stiffness coefficient and the theoretical vertical stiffness.

7. The method for testing the bonding strength of a plate-truss combined beam according to claim 1, wherein: The determining a target bonding degree based on the actual vertical stiffness and the target vertical stiffness includes: The actual vertical stiffness and the target vertical stiffness are substituted into a second calculation formula to obtain a target bonding degree. The second calculation formula is as follows: Where, is the target binding degree; is the actual vertical stiffness; is the target vertical stiffness.

8. A plate-truss combined beam bonding test system, characterized in that: The plate-truss composite beam bonding test system comprises: The first processing module is used to construct an experimental model and a theoretical model of the plate-truss combined cantilever beam, determine the theoretical lateral stiffness of the plate-truss combined cantilever beam based on the theoretical model, and perform a lateral loading test on the experimental model to obtain the actual lateral stiffness; a second processing module, configured to determine a second elastic modulus of concrete in the experimental model based on the theoretical lateral stiffness, the actual lateral stiffness, and the first elastic modulus of concrete in the theoretical model; a third processing module for constructing a target influence curve based on the second elastic modulus, the theoretical model, and the vertical spring stiffness coefficient, and determining a target vertical stiffness of the plate-truss combined cantilever beam in the theoretical model under fully consolidated conditions based on the target influence curve, wherein the target influence curve includes an influence relationship between the vertical spring stiffness coefficient and the theoretical vertical stiffness; a fourth processing module, which is used to perform a vertical loading test on the experimental model to obtain an actual vertical stiffness; A fifth processing module is configured to determine a target bonding degree based on the actual vertical stiffness and the target vertical stiffness.

9. A test device for the bonding strength of plate-truss combined beams, characterized in that: The plate-truss combined beam bonding degree testing device includes a processor, a memory, and a plate-truss combined beam bonding degree testing program stored in the memory and executable by the processor. When the plate-truss combined beam bonding degree testing program is executed by the processor, the steps of the plate-truss combined beam bonding degree testing method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a test program for the bonding degree of plate-truss combined beams, wherein when the test program for the bonding degree of plate-truss combined beams is executed by a processor, the steps of the method for testing the bonding degree of plate-truss combined beams according to any one of claims 1 to 7 are implemented.

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