Steel structure bridge and concrete box girder splicing performance detection method and system

Abstract

The application provides a steel structure bridge and concrete box girder splicing performance detection method and system, and relates to the technical field of detection. The method comprises the following steps: splicing a test concrete box girder and a test steel structure bridge, obtaining a splicing test duration, obtaining design information and first state information of a connecting point. Bridge design load information is obtained, and a test load is applied. After the test is completed, the first state information of the connecting point is obtained, and then splicing performance parameters and a detection report are determined. According to the application, the test concrete box girder and the test steel structure bridge can be used for testing. During the testing process, the test concrete box girder can be simulated to apply a test load in the actual use process of the bridge, so as to test whether the connecting point is firm and durable. In addition, the convenience of the splicing process can be determined based on the splicing test duration, so as to obtain the splicing performance parameters, and thus the splicing performance of the steel structure bridge and the concrete box girder can be accurately and objectively described.

Description

Technical Field

[0001] This invention relates to the field of testing technology, and in particular to a method and system for testing the splicing performance of steel structure bridges and concrete box girders. Background Technology

[0002] In related technologies, CN110333007B relates to the field of steel reinforcement stress monitoring technology, specifically disclosing a non-contact method and device for monitoring the stress of steel reinforcement inside bridges. The monitoring method includes: pre-establishing a stress state monitoring model that establishes the dependence between the stress state of the steel reinforcement inside the bridge and the deviation rate of the leakage magnetic field on the bridge surface; collecting the leakage magnetic field intensity on the bridge surface under and without external loads, calculating the leakage magnetic field deviation rate, and determining the stress state of the steel reinforcement inside the bridge based on the leakage magnetic field deviation rate on the bridge surface combined with the stress state monitoring model. The monitoring device includes: a magnetic sensor array, a serial port server, and a monitor. The magnetic sensor array is connected to the serial port server for data transmission, and the serial port server is connected to the monitor for data transmission. This method for monitoring the stress of steel reinforcement inside bridges is suitable for long-term monitoring, does not require damage to the bridge structure, and improves the effectiveness of steel reinforcement stress monitoring.

[0003] CN118980449A relates to the field of bridge prestressing detection technology, specifically disclosing a prestressing detection device for bridge engineering connection structures. The device includes two synchronously moving housings. Adsorption units are correspondingly arranged within the two housings, capable of adsorbing the bridge surface so that the bottom of the housing is in contact with the bridge surface. A detection unit for detecting prestressing is positioned between the two housings. During detection, the two housings are placed on either side of the bridge connection. After the corresponding adsorption units in the two housings adsorb the bridge surface and the bottom of the housing is in contact with the bridge surface, the detection unit detects the prestressing of the bridge connection structure and transmits the detected values ​​to a processor. This solution reduces the workload of manual correction, improves detection efficiency, and also improves detection accuracy, avoiding errors.

[0004] Therefore, while related technologies can detect the stress state of bridge structures such as steel bars, during bridge construction, steel structures are often spliced ​​with precast concrete box girders to improve construction efficiency. However, related technologies struggle to detect the splicing performance of steel structures and precast concrete box girders, making it difficult to determine whether the connection points are strong and durable.

[0005] The information disclosed in the background section of this application is intended only to enhance the understanding of the general background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] This invention provides a method and system for testing the splicing performance of steel structure bridges and concrete box girders, which can solve the technical problem that it is difficult to test the splicing performance of steel structure bridges and concrete box girders using related technologies.

[0007] According to a first aspect of the present invention, a method for testing the splicing performance of a steel structure bridge and a concrete box girder is provided, comprising:

[0008] The test concrete box girder was spliced ​​with the test steel structure bridge, and the splicing process was timed to obtain the splicing test duration.

[0009] Obtain design information for multiple connection points between the experimental concrete box girder and the experimental steel bridge structure;

[0010] Before the start of the load test period, first state information of multiple connection points is acquired, wherein the first state information includes first images of the connection points at multiple angles before the start of the load test period, and first position information of the connection points in a preset coordinate system.

[0011] Obtain bridge design load information;

[0012] Based on the bridge design load information, test loads were applied to the test concrete box girder during the load test period;

[0013] After the load test period ends, second state information of multiple connection points is acquired. The second state information includes second images of the connection points at multiple angles after the load test period ends, and second position information of the connection points in a preset coordinate system.

[0014] Based on the first state information, second state information, design information, and splicing test duration of the multiple connection points, the splicing performance parameters of the test concrete box girder and the test steel structure bridge are determined.

[0015] Based on the splicing performance parameters, a splicing performance test report is obtained.

[0016] According to a second aspect of the present invention, a system for testing the splicing performance of steel structure bridges and concrete box girders is provided, comprising:

[0017] The splicing test duration module is used to splice the test concrete box girder with the test steel structure bridge and to time the splicing process to obtain the splicing test duration.

[0018] The design information module is used to obtain design information for multiple connection points between the experimental concrete box girder and the experimental steel structure bridge.

[0019] The first state information module is used to acquire first state information of multiple connection points before the start of the load test period. The first state information includes first images of the connection points at multiple angles before the start of the load test period, and first position information of the connection points in a preset coordinate system.

[0020] The design load information module is used to obtain the bridge design load information.

[0021] The test load module is used to apply test loads to the test concrete box girder during the load test period based on the bridge design load information.

[0022] The second state information module is used to acquire the second state information of multiple connection points after the load test period ends. The second state information includes second images of the connection points from multiple angles after the load test period ends, and second position information of the connection points in a preset coordinate system.

[0023] The splicing performance parameter module is used to determine the splicing performance parameters of the test concrete box girder and the test steel structure bridge based on the first state information, second state information, design information and splicing test duration of the multiple connection points.

[0024] The test report module is used to obtain a splicing performance test report based on the splicing performance parameters.

[0025] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0026] According to the present invention, a test concrete box girder and a test steel structure bridge can be used for testing. During the test, the actual use of the bridge can be simulated by applying test loads to the test concrete box girder, thereby testing the strength and durability of the connection points. The ease of the splicing process can also be determined based on the splicing test duration, thus obtaining splicing performance parameters and accurately and objectively describing the splicing performance of the steel structure bridge and the concrete box girder. When determining the test load, the test load at various times can be set for the load application location of each test lane to simulate different types of vehicle traffic, making the load test closer to the actual use of the bridge, improving the realism of the load test, and making the second state information of the connection points observed after the load test more representative. When determining the splicing load-bearing performance parameters, cracking at the connection point can be detected by the relative difference between the number of pixels and the number of differences in the union region. Deformation and bolt loosening at the connection point can be detected by the intersection-union ratio of the first and second regions. The overall change of the connection point before and after the load test is determined based on the minimum of these two values. Furthermore, a weighted average of the overall changes at each connection point can be calculated based on the design information of each connection point to obtain the splicing load-bearing performance parameters. This objectively and accurately describes the changes at each connection point before and after the load test, accurately reflecting the robustness and durability of each connection point. When determining the splicing convenience parameters, the overall robustness and installation convenience of the splicing method in the splicing test can be determined separately, thereby determining the splicing convenience parameters. This accurately describes the cost-effectiveness of the splicing method, objectively determining whether higher splicing performance can be achieved with less construction time.

[0027] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Other features and aspects of the invention will become clearer from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0029] Figure 1 An exemplary flowchart illustrates a method for testing the splicing performance of steel structure bridges and concrete box girders according to an embodiment of the present invention;

[0030] Figure 2 A block diagram of a steel structure bridge and concrete box girder splicing performance testing system according to an embodiment of the present invention is shown as an example. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] The technical solution of the present invention will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0033] Figure 1 An exemplary flowchart illustrates a method for testing the splicing performance of steel structure bridges and concrete box girders according to an embodiment of the present invention, the method comprising:

[0034] Step S101: The test concrete box girder is spliced ​​with the test steel structure bridge, and the splicing process is timed to obtain the splicing test duration.

[0035] Step S102: Obtain design information for multiple connection points between the test concrete box girder and the test steel structure bridge;

[0036] Step S103: Before the start of the load test period, acquire the first state information of multiple connection points, wherein the first state information includes the first images of the connection points at multiple angles before the start of the load test period, and the first position information of the connection points in the preset coordinate system.

[0037] Step S104: Obtain bridge design load information;

[0038] Step S105: Apply test load to the test concrete box girder during the load test period according to the bridge design load information;

[0039] Step S106: After the load test period ends, acquire the second state information of multiple connection points, wherein the second state information includes second images of the connection points at multiple angles after the load test period ends, and the second position information of the connection points in the preset coordinate system.

[0040] Step S107: Determine the splicing performance parameters of the test concrete box girder and the test steel structure bridge based on the first state information, second state information, design information and splicing test duration of the multiple connection points.

[0041] Step S108: Obtain a splicing performance test report based on the splicing performance parameters.

[0042] According to an embodiment of the present invention, the method for testing the splicing performance of steel structure bridges and concrete box girders can be used to test both a test concrete box girder and a test steel structure bridge. During the test, the test load can be applied to the test concrete box girder in the manner of simulating the actual use of the bridge, thereby testing the strength and durability of the connection point. The convenience of the splicing process can also be determined based on the splicing test duration, thereby obtaining splicing performance parameters and accurately and objectively describing the splicing performance of steel structure bridges and concrete box girders.

[0043] According to one embodiment of the present invention, in step S101, the test concrete box girder can be one of multiple precast concrete box girders specifically for testing. The test steel structure bridge can be a steel structure pier for testing, and it is not necessary to manufacture a complete steel structure pier; only the upper and middle parts of the pier need to be manufactured, which can be connected to the test concrete box girder. This allows the performance of the connection point to be tested after assembly. During the assembly process, the assembly process can be timed to obtain the assembly test duration, which can be used to test the convenience of assembly in subsequent tests.

[0044] According to one embodiment of the present invention, in step S102, design information of multiple connection points between the test concrete box girder and the test steel structure bridge can be obtained. The design information may include the type of connection point and the maximum load it can withstand. For example, the test concrete box girder may have prefabricated connection structures, which can be connected to the connection structures on the test steel structure bridge to form the connection points. These connection points can be connected using bolted connections, welded connections, etc. That is, the type of connection point may include bolted connection points, welded connection points, etc. Different types of connection points have different maximum loads they can withstand, and a suitable type can be selected based on the load the connection point needs to withstand.

[0045] According to an embodiment of the present invention, in step S103, after the above-mentioned splicing is performed, a load test can be started. Before the start of the load test period, first state information of multiple connection points is acquired as the original state of each connection point, which is used as a reference for comparison with the state of each connection point after the load test. The first state information includes first images of the connection points from multiple angles before the start of the load test period, and first position information of the connection points in a preset coordinate system. The multiple angles may include top-view angles, front-view angles, side-view angles, etc. The preset coordinate system can be a pre-set coordinate system. For example, a coordinate system can be established with the centroid of the bottom surface of the pier of the steel structure bridge as the origin, the length direction of the test concrete box girder as the X-axis, the length direction of the test concrete box girder as the Y-axis, and the vertical direction as the Z-axis. The coordinates of multiple connection points in this coordinate system are actually measured to obtain the first position information. Alternatively, the relative positional relationship between each connection point and the origin can be determined based on the design data of the test concrete box girder and the test steel structure bridge, thereby determining the first position information of each connection point.

[0046] According to one embodiment of the present invention, in step S104, bridge design load information can be obtained, that is, design data of the load on the bridge deck, which can be used to determine the load that the bridge deck can withstand, and during the load test, it can be used to determine the weight data of vehicles simulating crossing the bridge.

[0047] According to one embodiment of the present invention, in step S105, a test load can be applied to the test concrete box girder during the load test period. The test load can be applied by simulating the actual use scenario of vehicles passing over the bridge deck. After a certain period of time (e.g., one month, three months, six months, etc.), the state of the connection point can be checked to determine the strength and durability of the connection point.

[0048] According to one embodiment of the present invention, applying a test load to a test concrete box girder during a load test period based on the bridge design load information includes: uniformly setting multiple test lanes on the upper surface of the test concrete box girder; uniformly setting multiple load application positions in each test lane; setting simulated vehicle parameters, wherein the simulated vehicle parameters are used to represent the type of simulated vehicle during the process of simulated vehicles passing through the test lanes; setting the driving speed of the simulated vehicles during the process of simulated vehicles passing through the test lanes; setting the interval between two adjacent simulated vehicles traveling to the first load application position of the lane during the process of simulated vehicles passing through the test lanes; and applying a test load to the test concrete box girder during the load test period based on the design load information, the load application positions, the simulated vehicle parameters, the driving speed, and the interval.

[0049] According to one embodiment of the present invention, multiple test lanes can be uniformly arranged along the length of the test concrete box girder, i.e., each test lane has the same width. Multiple load application positions are uniformly arranged along each test lane, for example, one load application position every 10 meters. At each load application position, a heavy object can be placed. The weight of this heavy object can be equal to the ratio of the bridge's design load information to the number of vehicles that can simultaneously exist on the upper surface of the test concrete box girder; that is, the weight of the heavy object can be equal to the maximum weight of the simulated vehicles. Furthermore, a vertical upward tension can be applied to the heavy object using lifting equipment, thereby reducing the load applied to the upper surface of the test concrete box girder by the heavy object. The tension applied to the heavy object by the lifting equipment at each moment can be determined based on the test load obtained by the following calculation, such that the weight of the heavy object minus the tension equals the test load.

[0050] According to one embodiment of the present invention, simulated vehicle parameters can be set to determine the type of vehicle being simulated, such as a large truck, a small passenger car, etc. Different types of simulated vehicles result in different weights, and thus different test loads during simulation. Based on the above settings, the pulling force applied by the lifting equipment to the load will also differ. Furthermore, different types of simulated vehicles will result in different vehicle dimensions (e.g., vehicle length).

[0051] According to one embodiment of the present invention, the driving speed of each simulated vehicle and the interval between adjacent vehicles traveling to the first load application position of the lane can also be set. After setting the above parameters, the lifting equipment at each load application position can be controlled so that the load applied by the weight at each load application position to the upper surface of the test concrete box girder is equal to the load borne by the load application position when the simulated vehicle passes by, thereby simulating the actual scenario of the vehicle passing by. The scenario of the vehicle passing by can be simulated multiple times for each test lane during the load test period. After the load test period ends, the condition of the connection point can be checked to determine whether the connection point is firm and durable in the actual use scenario.

[0052] According to one embodiment of the present invention, applying a test load to a test concrete box girder during a load test period based on the design load information, the load application location, the simulated vehicle parameters, the driving speed, and the interval duration includes: determining the weight of the simulated vehicle based on the simulated vehicle parameters of the j-th vehicle simulated during the simulated vehicle's passage through the i-th test lane and the design load information, and determining the length of the simulated vehicle based on the simulated vehicle parameters; determining the test load at time t of the k-th load application location in the i-th test lane during the load test period according to formula (1). , (1), in, Apply the distance between positions for adjacent loads in each test lane. This refers to the simulated speed of the (j+1)th vehicle during the simulation of a vehicle passing through the i-th test lane. This refers to the time interval between the simulated s-th vehicle and the (s+1)-th vehicle reaching the first load application position in the lane during the simulated vehicle's passage through the i-th test lane. This refers to the simulated speed of the j-th vehicle as it travels through the i-th test lane. This refers to the simulated vehicle length of the j-th vehicle during the simulated passage of the i-th test lane. Let s be the simulated vehicle weight of the j-th vehicle during the simulated vehicle's passage through the i-th test lane, where i, j, k, and s are all positive integers.

[0053] According to one embodiment of the present invention, in formula (1), each lane can simulate multiple different vehicle passing scenarios, and it can be assumed that at time t=0, each test lane has a simulated vehicle passing the first load application position. For the k-th load application position of the i-th test lane, when simulating a vehicle passing through the k-th load application position, the load at that position is the simulated vehicle weight. For example, when the j-th vehicle passes through this position, the test load at the k-th load application position is... The time when the j-th vehicle passes the first load application position on the i-th test lane is... The distance between the first load application location and the kth load application location is Therefore, the time required for the j-th vehicle to travel from the 1st load application position to the kth load application position is... Therefore, the time when the j-th vehicle arrives at the k-th load application position is The simulated vehicle length of the j-th vehicle is Therefore, the time when the j-th vehicle leaves the k-th load application position is In summary, at time t, it belongs to... In this case, the j-th vehicle passes through k load application positions, therefore, the experimental load borne at the k-th load application position is... .

[0054] According to one embodiment of the present invention, the time when the (j+1)th vehicle arrives at the kth load application position is Therefore, during the time interval between the moment when the j-th vehicle leaves the k-th load application position and the moment when the (j+1)-th vehicle arrives at the k-th load application position, the experimental load at the k-th load application position is 0. That is, at time t, the experimental load at the k-th load application position is 0. In the case of , the experimental load at the k-th load application location is 0.

[0055] According to an embodiment of the present invention, after setting the simulated vehicle model parameters, driving speed, and the interval time between adjacent vehicles traveling to the first load application position of the lane for each vehicle passing through the i-th test lane, the test load at each load application position at each time can be determined based on the above formula (1). Furthermore, the weight of the object minus the test load at each time is equal to the tension applied to the object by the lifting equipment at each time. The lifting equipment can be controlled based on this tension to simulate the scenario of vehicles passing through each lane in order to conduct the load test.

[0056] In this way, by applying test loads at different times to each test lane, different types of vehicles can be simulated, making the load test closer to the real use of the bridge, improving the realism of the load test, and making the second state information of the connection point observed after the load test more representative.

[0057] According to one embodiment of the present invention, in step S106, after the load test period ends, second state information of multiple connection points can be acquired, that is, second images of multiple angles of each connection point, for comparison with the first image, thereby determining whether the connection point is cracked, whether the bolt is loose, etc. The second position information of the connection point in a preset coordinate system can also be determined, thereby determining whether the test concrete box girder has experienced displacement or deformation, thus determining from another perspective whether the connection point is firm. That is, if the change in the second position information relative to the first position information is small, then the displacement or deformation of the test concrete box girder is small, and the connection point is relatively firm.

[0058] According to one embodiment of the present invention, in step S107, the splicing performance of the test concrete box girder and the test steel structure bridge can be determined by splicing performance parameters, such as whether the connection point is firm and durable, and whether the splicing and maintenance are convenient.

[0059] According to one embodiment of the present invention, determining the splicing performance parameters of the test concrete box girder and the test steel structure bridge based on the first state information, second state information, design information, and splicing test duration of the plurality of connection points includes: determining the splicing load-bearing performance parameters of the test concrete box girder and the test steel structure bridge based on the first state information, the second state information, and the design information; determining the splicing convenience parameters of the test concrete box girder and the test steel structure bridge based on the first state information, the second state information, and the splicing test duration; and determining the splicing performance parameters of the test concrete box girder and the test steel structure bridge based on the splicing load-bearing performance parameters and the splicing convenience parameters.

[0060] According to one embodiment of the present invention, by comparing the first state information and the second state information, it can be determined whether each connection point is abnormal, for example, the connection point of the welded connection is broken, or the connection point of the bolted connection is loose.

[0061] According to one embodiment of the present invention, determining the splicing load-bearing performance parameters of the test concrete box girder and the test steel structure bridge based on the first state information, the second state information, and the design information includes: determining the maximum load that each connection point can withstand based on the design information; obtaining first images of each connection point at multiple angles before the start of the load test period based on the first state information; performing binarization processing on the first images to obtain a first binarized image; obtaining second images of each connection point at multiple angles before the start of the load test period based on the second state information; performing binarization processing on the second images to obtain a second binarized image; and determining the splicing load-bearing performance parameters of the test concrete box girder and the test steel structure bridge based on the maximum load, the first binarized image, and the second binarized image.

[0062] According to one embodiment of the present invention, both the first image and the second image are binarized to reduce interference in the images, such as color changes caused by paint aging on the bolt, and only highlight the important changes in the second image relative to the first image, such as cracks in the weld joint, or changes in the position of the bolt nut after it has loosened.

[0063] According to an embodiment of the present invention, the splicing load-bearing performance parameters of the test concrete box girder and the test steel structure bridge are determined based on the maximum load, the first binarized image, and the second binarized image, including: obtaining a first region where the connection point is located in the first binarized image, and a second region where the connection point is located in the second binarized image; subtracting the first binarized image and the second binarized image at the same angle for the same connection point to obtain a difference image; in the difference image, determining the intersection region where the first region and the second region intersect, determining the union region where the first region and the second region are joined, and determining the number of differences of pixels with non-zero pixel values ​​in the union region; and determining the splicing load-bearing performance parameters of the test concrete box girder and the test steel structure bridge according to formula (2). , (2), in, Let be the number of pixels within the union region of the difference image at the y-th angle of the x-th connection point. Let be the number of differences corresponding to the difference image of the x-th connection point at the y-th angle. Let be the area of ​​the union region in the difference image of the x-th connection point at the y-th angle. Let be the area of ​​the intersection region in the difference image of the x-th connection point at the y-th angle, and min be the minimum value function. For the number of angles, The maximum load at the x-th connection point. This represents the maximum value of the maximum load at each connection point. The number of connection points, x, y, and All are positive integers.

[0064] According to an embodiment of the present invention, in formula (2), since the connection point may be deformed, in order to fully summarize the area where the connection point is located in the image, the union area of ​​the first region and the second region can be determined, and the difference between the first binarized image and the second binarized image is obtained. The difference image contains more obvious changes. For example, if the solder joint has a crack, the pixel value of the crack of the solder joint is not 0. The number of these pixels with non-zero pixel values ​​is the number of differences. The value represents the relative difference between the total number of pixels in the union region and the number of differences. The larger this relative difference is, the less difference there is between the first binarized image and the second binarized image. The smaller the change in the connection points, the stronger and more durable the connection points are. This value is mainly used to detect problems such as cracks in the connection points. The cross-union ratio (CUI) represents the intersection of the first and second regions. In the example, if the bolts become loose or displaced, the first and second regions will change, and the CUI will decrease. Therefore, the larger the CUI, the less difference there is between the first and second binarized images, the smaller the change in the connection point, and the stronger and more durable the connection point. This term is mainly used to detect whether the connection point has deformed or the bolts have loosened. The minimum value of the two terms can be taken to represent the situation where the difference between the first and second binarized images is the greatest, thus describing the overall change of the x-th connection point at the y-th angle. To minimize the overall change of the x-th connection point at various angles, thus describing the maximum difference of the x-th connection point before and after the load test, i.e., the overall change of the x-th connection point, the larger this value is, the smaller the overall change of the x-th connection point, and the more robust and durable the x-th connection point is. This can be used as a weight for each connection point. The greater the maximum load that a connection point can withstand, the greater the load that the connection point needs to withstand during use, and the higher the importance of the connection point. Therefore, a higher weight can be assigned to the connection point through this weight. Based on this weight, the overall change of each connection point is weighted and averaged to obtain the splicing load-bearing performance parameters of the test concrete box girder and the test steel structure bridge. This can be used to describe the strength and durability of all connection points. That is, the greater the splicing load-bearing performance parameter, the better the overall strength and durability of all connection points.

[0065] In this way, cracking at the connection point can be detected by the relative difference between the number of pixels and the number of differences in the union region. Deformation and bolt loosening at the connection point can be detected by the intersection-union ratio of the first and second regions. The overall change of the connection point before and after the load test can be determined based on the minimum of the two. Furthermore, the overall change of each connection point can be weighted and averaged based on the design information of each connection point to obtain the splicing load resistance performance parameters. This can objectively and accurately describe the change of each connection point before and after the load test, so as to accurately reflect the strength and durability of each connection point.

[0066] According to one embodiment of the present invention, determining the splicing convenience parameters of the test concrete box girder and the test steel structure bridge based on the first state information, the second state information, and the splicing test duration includes: obtaining a first length of the test concrete box girder and a second length of the concrete box girder to be installed; obtaining the planned installation duration of the concrete box girder to be installed; obtaining the first location information based on the first state information; obtaining the second location information based on the second state information; and determining the splicing convenience parameters of the test concrete box girder and the test steel structure bridge based on the first location information, the second location information, the first length, the second length, the splicing test duration, and the planned installation duration.

[0067] According to one embodiment of the present invention, the test concrete box girder is a portion of the concrete box girder used for testing, and its length is a first length. The second length of the concrete box girder to be installed is the design length after all the concrete box girders to be installed are installed.

[0068] According to one embodiment of the present invention, the ease-of-splitting parameters of the test concrete box girder and the test steel structure bridge are determined based on the first location information, the second location information, the first length, the second length, the splicing test duration, and the planned installation duration, including: determining the ease-of-splitting parameters of the test concrete box girder and the test steel structure bridge according to formula (3). , (3), in, This provides the first position information for the x-th connection point. This is the second position information of the x-th connection point. Let be the number of connection points, and min be the function that takes the minimum value. The duration of the splicing test, The planned installation duration is... For the second length, Given the first length, x and All are positive integers.

[0069] According to one embodiment of the present invention, in formula (3), The relative deviation between the first and second location information. This represents the similarity between the first and second positional information. A higher similarity indicates a smaller deviation between the first and second positional information, and a stronger connection. The minimum similarity among multiple connection points can be used to describe the overall similarity of the connection points, representing the maximum positional deviation and overall strength.

[0070] According to one embodiment of the present invention, in formula (3), The ratio of the second length to the first length. If the splicing is carried out according to the splicing test method, then the estimated time required to complete the splicing of all the concrete box girders to be installed is as follows. This is the ratio of the estimated duration to the planned installation duration. The smaller the ratio, the faster the installation speed of the splicing method in the splicing experiment, and the higher the convenience of installation and maintenance. This is the ratio between overall robustness and ease of installation. The higher the ratio, the higher the ratio between the performance and time consumption of splicing the test concrete box girder and the test steel structure bridge. In other words, the splicing method has a higher cost-effectiveness and can achieve higher splicing performance in less time. It can be used as a parameter for splicing convenience.

[0071] In this way, the overall robustness and ease of installation of the splicing method in the splicing test can be determined separately, and then the splicing ease parameter can be determined, thereby accurately describing the cost-effectiveness of the splicing method and objectively determining whether higher splicing performance can be obtained with less construction time.

[0072] According to one embodiment of the present invention, the splicing performance parameters of the test concrete box girder and the test steel structure bridge can be determined by weighted summation of the splicing load-bearing performance parameters and the splicing convenience parameters.

[0073] According to an embodiment of the present invention, in step S108, a splicing performance test report can be obtained based on the splicing performance parameters. The splicing performance test report is a textual report that can describe the overall strength and durability of the splicing, as well as the cost-effectiveness and scientific nature of the splicing method.

[0074] The method for testing the splicing performance of steel structure bridges and concrete box girders according to embodiments of the present invention can be used to test both a test concrete box girder and a test steel structure bridge. During the test, test loads can be applied to the test concrete box girder to simulate the actual use of the bridge, thereby testing the strength and durability of the connection points. The ease of the splicing process can also be determined based on the splicing test duration, thus obtaining splicing performance parameters and accurately and objectively describing the splicing performance of the steel structure bridge and the concrete box girder. When determining the test load, the test load at various times can be set for the load application location of each test lane to simulate different types of vehicles passing through, making the load test closer to the actual use scenario of the bridge, improving the realism of the load test, and making the second state information of the connection points observed after the load test more representative. When determining the splicing load-bearing performance parameters, cracking at the connection point can be detected by the relative difference between the number of pixels and the number of differences in the union region. Deformation and bolt loosening at the connection point can be detected by the intersection-union ratio of the first and second regions. The overall change of the connection point before and after the load test is determined based on the minimum of these two values. Furthermore, a weighted average of the overall changes at each connection point can be calculated based on the design information of each connection point to obtain the splicing load-bearing performance parameters. This objectively and accurately describes the changes at each connection point before and after the load test, accurately reflecting the robustness and durability of each connection point. When determining the splicing convenience parameters, the overall robustness and installation convenience of the splicing method in the splicing test can be determined separately, thereby determining the splicing convenience parameters. This accurately describes the cost-effectiveness of the splicing method, objectively determining whether higher splicing performance can be achieved with less construction time.

[0075] Figure 2 An exemplary block diagram of a steel structure bridge and concrete box girder splicing performance testing system according to an embodiment of the present invention is shown, the system comprising:

[0076] The splicing test duration module is used to splice the test concrete box girder with the test steel structure bridge and to time the splicing process to obtain the splicing test duration.

[0077] The design information module is used to obtain design information for multiple connection points between the experimental concrete box girder and the experimental steel structure bridge.

[0078] The first state information module is used to acquire first state information of multiple connection points before the start of the load test period. The first state information includes first images of the connection points at multiple angles before the start of the load test period, and first position information of the connection points in a preset coordinate system.

[0079] The design load information module is used to obtain the bridge design load information.

[0080] The test load module is used to apply test loads to the test concrete box girder during the load test period based on the bridge design load information.

[0081] The second state information module is used to acquire the second state information of multiple connection points after the load test period ends. The second state information includes second images of the connection points from multiple angles after the load test period ends, and second position information of the connection points in a preset coordinate system.

[0082] The splicing performance parameter module is used to determine the splicing performance parameters of the test concrete box girder and the test steel structure bridge based on the first state information, second state information, design information and splicing test duration of the multiple connection points.

[0083] The test report module is used to obtain a splicing performance test report based on the splicing performance parameters.

[0084] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for testing the splicing performance of steel structure bridges and concrete box girders, characterized in that, include: The test concrete box girder was spliced ​​with the test steel structure bridge, and the splicing process was timed to obtain the splicing test duration. Obtain design information for multiple connection points between the experimental concrete box girder and the experimental steel bridge structure; Before the start of the load test period, first state information of multiple connection points is acquired, wherein the first state information includes first images of the connection points at multiple angles before the start of the load test period, and first position information of the connection points in a preset coordinate system. Obtain bridge design load information; Based on the bridge design load information, test loads were applied to the test concrete box girder during the load test period; After the load test period ends, second state information of multiple connection points is acquired. The second state information includes second images of the connection points at multiple angles after the load test period ends, and second position information of the connection points in a preset coordinate system. Based on the first state information, second state information, design information, and splicing test duration of the multiple connection points, the splicing performance parameters of the test concrete box girder and the test steel structure bridge are determined. Based on the splicing performance parameters, a splicing performance test report is obtained.

2. The method for testing the splicing performance of steel structure bridges and concrete box girders according to claim 1, characterized in that, Based on the bridge design load information, test loads were applied to the test concrete box girder during the load test period, including: Multiple test lanes were evenly set on the upper surface of the test concrete box girder; Multiple load application points are evenly distributed in each test lane; Set the simulated vehicle model parameters, wherein the simulated vehicle model parameters are used to indicate the type of vehicle being simulated as the simulated vehicle passes through the test track; The simulated vehicle speed is set as it passes through the test track. The time interval between two adjacent simulated vehicles traveling to the first load application position in the lane is set during the process of the simulated vehicle passing through the test lane. Based on the design load information, the load application location, the simulated vehicle parameters, the driving speed, and the interval duration, a test load is applied to the test concrete box girder during the load test period.

3. The method for testing the splicing performance of steel structure bridges and concrete box girders according to claim 2, characterized in that, Based on the design load information, the load application location, the simulated vehicle parameters, the driving speed, and the interval duration, a test load is applied to the test concrete box girder during the load test period, including: Based on the simulated vehicle model parameters and the design load information of the j-th vehicle simulated during the process of the simulated vehicle passing through the i-th test lane, the weight of the simulated vehicle is determined, and the length of the simulated vehicle is determined based on the simulated vehicle model parameters. According to the formula ， Determine the test load at time t within the load test time period for the k-th load application position of the i-th test lane. ,in, Apply the distance between positions for adjacent loads in each test lane. This refers to the simulated speed of the (j+1)th vehicle during the simulation of a vehicle passing through the i-th test lane. This refers to the time interval between the simulated s-th vehicle and the (s+1)-th vehicle reaching the first load application position in the lane during the simulated vehicle's passage through the i-th test lane. This refers to the simulated speed of the j-th vehicle as it travels through the i-th test lane. This refers to the simulated vehicle length of the j-th vehicle during the simulated passage of the i-th test lane. Let s be the simulated vehicle weight of the j-th vehicle during the simulated vehicle's passage through the i-th test lane, where i, j, k, and s are all positive integers.

4. The method for testing the splicing performance of steel structure bridges and concrete box girders according to claim 1, characterized in that, Based on the first state information, second state information, design information, and splicing test duration of the multiple connection points, the splicing performance parameters of the test concrete box girder and the test steel structure bridge are determined, including: Based on the first state information, the second state information, and the design information, determine the splicing load-bearing performance parameters of the test concrete box girder and the test steel structure bridge; Based on the first state information, the second state information, and the splicing test duration, the splicing convenience parameters of the test concrete box girder and the test steel structure bridge are determined; Based on the splicing load-bearing performance parameters and the splicing convenience parameters, the splicing performance parameters of the experimental concrete box girder and the experimental steel structure bridge were determined.

5. The method for testing the splicing performance of steel structure bridges and concrete box girders according to claim 4, characterized in that, Based on the first state information, the second state information, and the design information, the splicing load-bearing performance parameters of the experimental concrete box girder and the experimental steel structure bridge are determined, including: Based on the design information, determine the maximum load that each connection point can withstand; Based on the first state information, obtain first images of each connection point from multiple angles before the start of the load test period; The first image is binarized to obtain a first binarized image; Based on the second state information, obtain second images of each connection point from multiple angles before the start of the load test period; The second image is binarized to obtain a second binarized image; Based on the maximum load, the first binarized image, and the second binarized image, the splicing load-bearing performance parameters of the test concrete box girder and the test steel structure bridge are determined.

6. The method for testing the splicing performance of steel structure bridges and concrete box girders according to claim 5, characterized in that, Based on the maximum load, the first binarized image, and the second binarized image, the splicing load-bearing performance parameters of the test concrete box girder and the test steel structure bridge are determined, including: Obtain the first region where the connection points are located in the first binarized image, and the second region where the connection points are located in the second binarized image; The difference image is obtained by subtracting the first and second binarized images of the same connection point at the same angle. In the difference image, the intersection region of the first region and the second region is determined, the union region of the first region and the second region is determined, and the number of differences of pixels with non-zero pixel values ​​in the union region is determined. According to the formula ， Determine the splice load-bearing performance parameters of the experimental concrete box girder and the experimental steel structure bridge. ,in, Let be the number of pixels within the union region of the difference image at the y-th angle of the x-th connection point. Let be the number of differences corresponding to the difference image of the x-th connection point at the y-th angle. Let be the area of ​​the union region in the difference image of the x-th connection point at the y-th angle. Let be the area of ​​the intersection region in the difference image of the x-th connection point at the y-th angle, and min be the minimum value function. For the number of angles, The maximum load at the x-th connection point. This represents the maximum value of the maximum load at each connection point. The number of connection points, x, y, and All are positive integers.

7. The method for testing the splicing performance of steel structure bridges and concrete box girders according to claim 4, characterized in that, Based on the first state information, the second state information, and the splicing test duration, the splicing convenience parameters between the test concrete box girder and the test steel structure bridge are determined, including: Obtain the first length of the test concrete box girder and the second length of the concrete box girder to be installed; Obtain the planned installation time for the concrete box girder to be installed; Based on the first status information, obtain the first location information; Based on the second status information, obtain the second location information; Based on the first location information, the second location information, the first length, the second length, the splicing test duration, and the planned installation duration, the splicing convenience parameters between the test concrete box girder and the test steel structure bridge are determined.

8. The method for testing the splicing performance of steel structure bridges and concrete box girders according to claim 7, characterized in that, Based on the first location information, the second location information, the first length, the second length, the splicing test duration, and the planned installation duration, the splicing convenience parameters between the test concrete box girder and the test steel structure bridge are determined, including: According to the formula ， Determine the splicing convenience parameters between the experimental concrete box girder and the experimental steel structure bridge. ,in, This provides the first position information for the x-th connection point. This is the second position information of the x-th connection point. Let be the number of connection points, and min be the function that takes the minimum value. The duration of the splicing test, The planned installation duration is... For the second length, Given the first length, x and All are positive integers.

9. A system for testing the splicing performance of steel structure bridges and concrete box girders, characterized in that, include: The splicing test duration module is used to splice the test concrete box girder with the test steel structure bridge and to time the splicing process to obtain the splicing test duration. The design information module is used to obtain design information for multiple connection points between the experimental concrete box girder and the experimental steel structure bridge. The first state information module is used to acquire first state information of multiple connection points before the start of the load test period. The first state information includes first images of the connection points at multiple angles before the start of the load test period, and first position information of the connection points in a preset coordinate system. The design load information module is used to obtain the bridge design load information. The test load module is used to apply test loads to the test concrete box girder during the load test period based on the bridge design load information. The second state information module is used to acquire the second state information of multiple connection points after the load test period ends. The second state information includes second images of the connection points from multiple angles after the load test period ends, and second position information of the connection points in a preset coordinate system. The splicing performance parameter module is used to determine the splicing performance parameters of the test concrete box girder and the test steel structure bridge based on the first state information, second state information, design information and splicing test duration of the multiple connection points. The test report module is used to obtain a splicing performance test report based on the splicing performance parameters.

Images