Test system for composite working condition action of steel-concrete composite beam section and use method

Abstract

The invention discloses a steel-concrete composite beam section composite working condition effect test system and a use method.The test system comprises a three-dimensional loading device and a sensor system, the three-dimensional loading device loads a steel-concrete composite beam model in the vertical direction and the longitudinal direction, and the three-dimensional loading device comprises longitudinal loading beams arranged on the two sides of the steel-concrete composite beam model; the vertical loading beam is arranged above the steel-concrete composite beam model, and the vertical loading system is arranged between the vertical loading beam and the steel-concrete composite beam model; the three-dimensional loading device comprises a top loading part and a bottom loading part, two ends of the top loading part and the bottom loading part are respectively connected with a longitudinal loading beam, the top loading part is positioned at the upper part of the longitudinal loading beam, the bottom loading part is positioned at the lower part of the longitudinal loading beam, and the longitudinal loading beam is fixed with the steel-concrete composite beam model; the test can be carried out in a space-limited test environment, the self-balancing loading function is achieved, the loading device is simple and flexible, and errors in the loading process can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of steel-concrete bridge structure testing, and more specifically, to a testing system and a use method for a steel-concrete combined beam section under composite working conditions. Background Art

[0002] The steel-concrete combined section is an important connecting member in structures such as hybrid beam cable-stayed bridges, continuous beam rigid frame bridges, and steel arch bridges. One side of the section is connected to the concrete beam and the other side is connected to the steel beam. It is used to ensure a smooth transition of internal force and stiffness between the concrete beam and the steel beam. This part is subjected to the combined effect of coupled loads, and the force transmission, force bearing, and structural construction are very complex.

[0003] In order to find out the force transmission and stress bearing mechanism of the steel-concrete joint section and optimize the reasonable structure of the joint section, finite element numerical simulation calculation and model test methods are widely used at home and abroad. Among them, finite element numerical calculation has model error and grid division dependence, which directly affects the accuracy of the results. Therefore, model tests are still needed to verify and check the finite element model. The two complement each other's advantages.

[0004] At present, there is no standard test method for steel-concrete composite section model test at home and abroad, which may lead to differences in test methods, equipment configuration and data analysis among different laboratories and research institutions, affecting the comparability and universality of the results. The steel-concrete composite section model test system under complex working conditions can especially meet the high cost of large-scale model testing. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a test system and a method for using a steel-concrete composite beam segment under composite working conditions. The test system is suitable for effectively conducting tests in a test environment with limited space. The three-dimensional loading device has a self-balancing loading function. The loading device is simple and flexible, and can effectively reduce errors in the loading process, thereby improving the stability and reliability of the test.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a test system for composite working conditions of steel-concrete composite beam sections is provided, comprising a three-dimensional loading device for loading a steel-concrete composite beam model from vertical and longitudinal directions, and a sensor system arranged on the three-dimensional loading device and the steel-concrete composite beam model, wherein the three-dimensional loading device comprises longitudinal loading beams arranged on both sides of the steel-concrete composite beam model, and a vertical loading beam arranged above the steel-concrete composite beam model, and the vertical loading system is arranged between the vertical loading beam and the steel-concrete composite beam model; the three-dimensional loading device comprises a top loading component and a bottom loading component, and the two ends of the top loading component and the bottom loading component are respectively connected to the longitudinal loading beams located on both sides of the steel-concrete composite beam model, the top loading component is located at the upper part of the longitudinal loading beam, and the bottom loading component is located at the lower part of the longitudinal loading beam, and the longitudinal loading beam is fixed to the steel-concrete composite beam model.

[0007] Furthermore, a force transmission beam and a force transmission pad are sequentially arranged under the vertical load system, and two ends of the vertical load system are respectively abutted against the vertical loading beam and the force transmission beam, and the force applied by the vertical load system is sequentially transmitted to the steel-concrete composite beam model through the force transmission beam and the force transmission pad.

[0008] Furthermore, the force transfer pads are arranged in multiple groups and laid flat on the upper surface of the steel-concrete composite beam model.

[0009] Furthermore, the sensor system includes a pressure sensor, an axial force gauge, a displacement sensor and a strain gauge. The pressure sensor is arranged between the vertical load system and the force transmission beam. The axial force gauge is fixed to the end of the top load-applying component and contacts the longitudinal loading beam. The displacement sensor is arranged on the bottom load-applying component. The upper end of the displacement sensor is fixed to the steel-concrete composite beam model. The strain gauge is fitted on the upper and lower surfaces of the steel-concrete composite beam model.

[0010] Furthermore, the steel-concrete composite beam model comprises a concrete box beam section, a steel-concrete composite section and a steel box beam section connected in sequence, wherein the concrete box beam section, the steel-concrete composite section and the steel box beam section are located at the top of the model and are flush with the surface, and the bottom and top of the model are mirrored along a horizontal plane.

[0011] Furthermore, the longitudinal loading beam is fixed to the concrete box beam section via a locking device, and the longitudinal loading beam is fixedly connected to the steel box beam section via a stiffening plate.

[0012] Furthermore, the locking device is vertically installed on the side of the longitudinal loading beam, the locking device is fixed to the longitudinal loading beam by welding or by bolts, and the stiffening plate is located on the side of the steel box beam section.

[0013] Furthermore, the bottom of the longitudinal loading beam is supported by a hinge device.

[0014] According to a second aspect of the present invention, a method for using a test system for composite working conditions of a steel-concrete composite beam segment is provided, comprising the following steps:

[0015] S100, based on the steel-concrete composite beam structure in actual bridge engineering, determine the model size of the half structure located on the central axis in the transverse direction of the bridge. The steel-concrete composite beam segment model should include concrete box beam, steel-concrete composite segment and steel box beam segment;

[0016] S200, the steel-concrete composite beam segment model is processed and formed, and placed in a three-dimensional loading device, and the sensor system is fixedly installed;

[0017] S300, the top load-applying components and the top load-applying components apply loads, and the transverse loading beam transmits the applied force to the steel-concrete composite beam segment model, so as to realize the steel-concrete composite beam segment model applying longitudinal bridge axial force working condition;

[0018] S400, the vertical load system applies loads, and transmits vertical forces to the steel-concrete composite beam segment model through force transmission beams and force transmission pads, so as to realize the combined working condition of applying vertical shear force and bending moment to the steel-concrete composite beam segment model;

[0019] S500, independently operate the top load-applying component and the top load-applying component, respectively adjust the force ratio between the top load-applying component and the top load-applying component, and generate an eccentric force on the steel-concrete composite beam segment model, so as to achieve the effect of applying a bending moment condition to the steel-concrete composite beam segment model, and realize the supplement of the situation that the bearing requirements cannot be met when only the bending moment condition is applied by the vertical load system or the conditions for applying the vertical load system are not met;

[0020] S600, the correlation between the applied load and the steel-concrete composite beam segment model subjected to the combined action of axial force, shear force and bending moment is calculated by the following formula:

[0021] T = T1 + T2;

[0022]

[0023]

[0024] Among them, T represents the axial force condition of the steel-concrete composite beam segment model, Q represents the shear force condition of the model, W represents the bending moment condition of the model, T1 represents the load value on the top of the model, T2 represents the load value on the bottom of the model, T3 represents the vertical load value of the model, L represents the vertical distance between the top and bottom load points of the model, and H represents the longitudinal clear span value of the model;

[0025] S700, during the load application process, a fixed sensor system installed on the model monitors the strain, displacement and applied force of the steel-concrete composite beam model in real time, and plots the data into a monitoring data curve.

[0026] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0027] 1. The present invention provides a test system for composite working conditions of steel-concrete combined beam sections, which can construct a test system capable of simulating complex working conditions of steel-concrete combined sections in a relatively small space, thereby helping to improve the flexibility and operability of the test, and is particularly suitable for effectively conducting tests in a test environment with limited space. The three-dimensional loading device has a self-balancing loading function, is simple and flexible, and can effectively reduce errors in the loading process, thereby improving the stability and reliability of the test.

[0028] 2. The present invention provides a test system for composite working conditions of steel-concrete composite beam sections. The test system can effectively simulate various loading conditions of the steel-concrete composite section under composite working conditions, such as a combination of longitudinal and vertical loads, to meet different test requirements and help study complex mechanical problems.

[0029] 3. The present invention provides a test system for composite working conditions of steel-concrete composite beam sections. The sensor system integrated through systematic monitoring and control can monitor strain, displacement and applied force in real time, and feed back data to the intelligent control system through wireless technology, which is convenient for real-time observation and analysis, improves the timeliness and accuracy of data, and the integrated design of modular control and monitoring data collection and processing shortens the time for data analysis and result feedback.

[0030] 4. The present invention provides a test system for composite working conditions of steel-concrete composite beam sections, which can promote the promotion of standardized test methods. By providing this test method, it is helpful to promote the standardization of steel-concrete composite section tests, make the test results between different laboratories and research institutions more comparable, and provide a more unified research benchmark for the industry.

[0031] 5. The present invention provides a test system for composite working conditions of steel-concrete composite beam sections. The existing test system does not have a self-balancing function, and the loading system has various and complex functions, and the test equipment cost is higher. The loading device of the system is simple and flexible, and has an automatic loading function, which reduces the development cost of the loading equipment and improves the loading efficiency, so that more research institutions can afford and use similar test equipment, thereby expanding the popularity of the research. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A longitudinal cross-sectional view of a test system for composite working conditions of a steel-concrete composite beam segment according to an embodiment of the present invention;

[0033] Figure 2 A cross-sectional view of a test system for composite working conditions of a steel-concrete composite beam segment according to an embodiment of the present invention;

[0034] Figure 3 The CC section view of the steel-concrete composite beam model in the embodiment of the present invention

[0035] Figure 4 AA section view of the steel-concrete composite beam model in the embodiment of the present invention;

[0036] Figure 5 BB section view of the steel-concrete composite beam model in the embodiment of the present invention;

[0037] Figure 6 It is a force diagram of a steel-concrete composite beam model in an embodiment of the present invention;

[0038] Figure 7 An example of a graph of axial force / bending moment-measurement point stress / displacement values ​​in an embodiment of the present invention;

[0039] Figure 8 This is an example of a maximum axial force control working condition-stress value curve diagram in an embodiment of the present invention;

[0040] Fig. 9 This is an example of a maximum bending moment control working condition-stress value curve diagram in an embodiment of the present invention;

[0041] Fig.10 This is an example of a maximum bending moment control working condition-mid-span displacement value curve diagram in an embodiment of the present invention;

[0042] Fig.11 This is a diagram of a method of using a test system for composite working conditions of a steel-concrete composite beam segment according to an embodiment of the present invention.

[0043] In all the drawings, the same figure numbers represent the same technical features, specifically: 100, three-dimensional loading device; 200, sensor system; 300, steel-concrete composite beam model; 400, intelligent control system; 301, concrete box beam section; 302, steel-concrete composite section; 303, steel box beam section; 304, prestressed beam; 101, vertical loading beam; 102, vertical force transmission device; 103, vertical load system; 104, force transmission beam; 105, force transmission pad; 106, top load component; 107, stiffening plate; 108, longitudinal loading beam; 109, bottom load component; 110, locking device; 201, pressure sensor; 202, axial force gauge; 204, displacement sensor; 205, strain gauge. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] like Figure 1-Figure 5 As shown, according to the first aspect of the present invention, a test system for composite working conditions of a steel-concrete composite beam segment is provided, comprising a three-dimensional loading device 100 for loading a steel-concrete composite beam model 300 from the vertical and longitudinal directions, and a sensor system 200 provided on the three-dimensional loading device 100 and the steel-concrete composite beam model 300. The sensor system 200 transmits the data detected during the test to the intelligent control system 400 for analysis and processing. The sensor system transmits the detected data parameters, i.e., stress, displacement value, force value and other data to the intelligent control system 400. When the intelligent control system 400 identifies that the data reaches the set value, the loading is stopped, or the loading of the next stage is continued after identifying that the data does not reach the set value. After the test is completed, the data parameter curve is plotted. The test system can be constructed in a relatively small space and can flexibly adapt to different research needs.

[0046] Furthermore, if Figure 1 As shown, the cross section of the steel-concrete composite beam model 300 of the loading object of the test system is in the shape of an "I", including a concrete box beam section 301, a steel-concrete composite section 302 and a steel box beam section 303 connected in sequence. The above three are located at the top of the model and the surface is set flush. The bottom and top of the model are mirrored along the horizontal plane. The model is a scaled model of the steel-concrete composite section. The prestressed beam 304 passes through the concrete box beam section 301 and the steel-concrete composite section 302 in sequence, and the two ends pass through the concrete side end fixed to the concrete box beam section 301 and the steel plate structure of the steel-concrete composite section 302, respectively, so that the concrete box beam section 301 and the steel-concrete composite section 302 are more firmly connected.

[0047] Furthermore, if Figure 1As shown, the three-dimensional loading device 100 includes longitudinal loading beams 108 arranged on both sides of the steel-concrete composite beam model 300, and a vertical loading beam 101 arranged above the steel-concrete composite beam model 300. The vertical load system 103 is arranged between the vertical loading beam 101 and the steel-concrete composite beam model 300. The vertical load system 103 is arranged vertically, and the force applied from below is transmitted to the steel-concrete composite beam model 300 through the force transmission beam 104 and the force transmission pad 105 in sequence, so as to realize the vertical loading of the steel-concrete composite beam model 300. Preferably, the force transmission pad 105 is arranged in multiple groups and laid flat on the upper surface of the steel-concrete composite beam model 300. The force transmission beam 104 is made of steel, and the force transmission pad 105 can be made of steel or concrete. Both are placed statically by their own weight.

[0048] Furthermore, both ends of the top load-applying component 106 and the bottom load-applying component 109 are respectively connected to the longitudinal loading beams 108 located on both sides of the steel-concrete composite beam model 300, wherein the top load-applying component 106 is located at the upper part of the longitudinal loading beam 108, and the bottom load-applying component 109 is located at the lower part of the longitudinal loading beam 108. The loads applied by the top load-applying component 106 and the bottom load-applying component 109 are transmitted to the steel-concrete composite beam model 300 through the longitudinal loading beam 108. The load-applying operation process is to use the loading system to apply force to the jacks at the ends of the components, and the jacks transmit the force to the top load-applying component 106 and the bottom load-applying component 109. Furthermore, the longitudinal loading beam 108 is fixed to the concrete box beam section 301 by a locking device 110, and the longitudinal loading beam 108 is fixedly connected to the steel box beam section 303 by a stiffening plate 107. After the longitudinal loading beams 108 located on both sides of the steel-concrete composite beam model 300 are fixed to the concrete box beam section 301 and the steel box beam section 303 respectively, the shear force received by the steel-concrete composite beam model 300 is transmitted to the longitudinal loading beam 108. Preferably, the locking device 110 is a flat plate structure vertically mounted on the side of the longitudinal loading beam 108, the locking device 110 is fixed to the longitudinal loading beam 108 by welding or bolts, the stiffening plate 107 is located on the side of the steel box beam section 303, and the locking device 110 and the stiffening plate 107 are arranged in pairs to clamp and fix the steel-concrete composite beam model 300.

[0049] Furthermore, the two ends of the vertical load system 103 are respectively abutted against the vertical loading beam 101 and the force transmission beam 104. The reaction force received by the vertical load system 103 is applied to the vertical loading beam 101, and the force is further transmitted to the longitudinal loading beam 108 through the vertical force transmission device 102, thereby realizing the self-balancing loading function of the three-dimensional loading device 100. The force transmission device 102 is a plurality of distributed steel bundles, each of which passes through the reserved perforations of the loading beam. There are anchoring ends at both ends of the steel bundles, and the anchoring ends are used to realize the anchoring with the loading beam 108. Preferably, the vertical load system 103 is a vertical jack. Furthermore, the bottom of the longitudinal loading beam 108 is supported on the test bench or the reference plane by the hinge device 110, and the three-dimensional loading device 100 is supported and fixed by the hinge device 110, which constrains the stress deformation of the model during loading, and can realize the model-assisted simulation of the actual engineering stress mode.

[0050] Further, the sensor system 200 includes a pressure sensor 201, an axial force meter 202, a displacement sensor 204 and a strain gauge 205, which are used to monitor the strain, displacement and applied force of the steel-concrete composite beam model 300 in real time, and transmit the monitoring data to the intelligent control system 400. Specifically, the pressure sensor 201 is arranged between the vertical load system 103 and the force transmission beam 104, and is used to monitor the output pressure of the vertical load system 103. The axial force meter 202 is fixed to the end of the top load-applying component 106 and contacts the longitudinal loading beam 108. When the top load-applying component 106 applies a load, the axial force meter 202 is squeezed by the longitudinal loading beam 108. The displacement sensor 204 is arranged on the bottom load-applying component 109, and its upper end is fixed to the steel-concrete composite beam model 300. The strain gauge 205 is fitted at multiple positions on the upper and lower surfaces of the steel-concrete composite beam model 300. Preferably, the strain gauge 205 should adopt a miniaturized, high-precision surface strain gauge commonly used in the market.

[0051] Further, according to another aspect of the present invention, a method for using a composite working condition test system for a steel-concrete composite beam segment is provided, and the specific steps are as follows:

[0052] S100, based on the steel-concrete composite beam structure in actual bridge engineering, determine the model size of the half structure located on the central axis in the transverse direction of the bridge, and the steel-concrete composite beam segment model 300 should include a concrete box beam segment 301, a steel-concrete composite segment 302, and a steel box beam segment 303;

[0053] S200, forming a steel-concrete composite beam segment model 300, placing it in a three-dimensional loading device 100, and fixing and installing a sensor system 200;

[0054] S300, the top load-applying component 106 and the bottom load-applying component 109 apply loads, and the transverse loading beam transmits the applied force to the steel-concrete composite beam segment model 300, so that the steel-concrete composite beam segment model 300 applies longitudinal bridge axial force;

[0055] S400, the vertical load system 103 applies load, and transmits vertical force to the steel-concrete composite beam segment model 300 through the force transmission beam 104 and the force transmission pad 105, so as to realize the combined working condition of vertical shear force and bending moment applied to the steel-concrete composite beam segment model 300;

[0056] S500, independently operate the top load-applying component 106 and the bottom load-applying component 109, and respectively adjust the force ratio between the top load-applying component 106 and the bottom load-applying component 109, so as to generate an eccentric force on the steel-concrete composite beam segment model 300, so as to achieve the effect of applying a bending moment condition to the steel-concrete composite beam segment model 300, and realize the supplement of the situation that the bearing requirements cannot be met when only the bending moment condition is applied by the vertical load system 103 or the conditions for applying the vertical load system 103 are not met;

[0057] S600, the correlation between the load applied by the intelligent control system 400 and the combined working condition of the steel-concrete composite beam segment model 300 subjected to axial force, shear force and bending moment is calculated by the following formula:

[0058] T = T1 + T2;

[0059]

[0060] Among them, T represents the axial force condition of the steel-concrete composite beam segment model, Q represents the shear force condition of the model, W represents the bending moment condition of the model, T1 represents the load value on the top of the model, T2 represents the load value on the bottom of the model, T3 represents the vertical load value of the model, L represents the vertical distance between the top and bottom load points of the model, and H represents the longitudinal clear span value of the model;

[0061] S700, during the process of applying load by the intelligent control system 400, the sensor system 200 fixed on the model monitors the strain, displacement and applied force of the steel-concrete composite beam model 300 in real time, and transmits the data to the intelligent control system 400, which draws the monitoring data curve with the above monitoring data. Preferably, the data transmission process adopts wireless transmission mode, and the curve obtained after processing by the intelligent control system 400 needs to be compared with the calculation results of the simulation software in real time to verify the accuracy of the data model test results. When the data differs too much from the simulation calculation results and the trend of the data curve is obviously wrong, it will be fed back to the intelligent system to remind the error, so that the test personnel can further investigate the cause of the problem.

[0062] The following table is a test data record table, which includes the axial force value, measuring point stress and measuring point displacement data:

[0063] Axial force / kN Measuring point stress / MPa Measuring point displacement / mm

[0064] Actual monitoring data table (example)

[0065] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A test system for composite working conditions of steel-concrete composite beam segments, characterized in that: The invention comprises a three-dimensional loading device (100) for loading a steel-concrete composite beam model (300) in a vertical and longitudinal direction, and a sensor system (200) arranged on the three-dimensional loading device (100) and the steel-concrete composite beam model (300); wherein: The three-dimensional loading device (100) comprises longitudinal loading beams (108) arranged on both sides of the steel-concrete composite beam model (300), and a vertical loading beam (101) arranged above the steel-concrete composite beam model (300), and a vertical load system (103) is arranged between the vertical loading beam (101) and the steel-concrete composite beam model (300); The three-dimensional loading device (100) comprises a top load-applying component (106) and a bottom load-applying component (109), the two ends of the top load-applying component (106) and the bottom load-applying component (109) are respectively connected to longitudinal load-applying beams (108) located on both sides of a steel-concrete composite beam model (300), the top load-applying component (106) is located on the upper part of the longitudinal load-applying beam (108), the bottom load-applying component (109) is located on the lower part of the longitudinal load-applying beam (108), and the longitudinal load-applying beam (108) is fixed to the steel-concrete composite beam model (300), so as to realize self-balancing loading and effectively reduce errors in the loading process.

2. The test system for composite working conditions of steel-concrete composite beam segments according to claim 1 is characterized in that: The vertical load system (103) is provided with a force transmission beam (104) and a force transmission pad (105) in sequence, and two ends of the vertical load system (103) are respectively abutted against the vertical loading beam (101) and the force transmission beam (104); The force applied by the vertical load system (103) is sequentially transmitted to the steel-concrete composite beam model (300) through the force transmission beam (104) and the force transmission pad (105).

3. The test system for composite working conditions of steel-concrete composite beam segments according to claim 2 is characterized in that: The force transmission pads (105) are arranged in multiple groups and laid flat on the upper surface of the steel-concrete combined beam model (300).

4. A test system for composite working conditions of steel-concrete composite beam segments according to any one of claims 1 to 3, characterized in that: The sensor system (200) comprises a pressure sensor (201), an axial force meter (202), a displacement sensor (204) and a strain gauge (205); The pressure sensor (201) is arranged between the vertical load system (103) and the force transmission beam (104), and the axial force meter (202) is fixed to the end of the top load-applying component (106) and is in contact with the longitudinal loading beam (108); The displacement sensor (204) is arranged on the bottom load-applying component (109), the upper end of the displacement sensor (204) is fixed to the steel-concrete combined beam model (300), and the strain gauge (205) is fitted on the upper and lower surfaces of the steel-concrete combined beam model (300).

5. A test system for composite working conditions of steel-concrete composite beam segments according to any one of claims 1 to 3, characterized in that: The steel-concrete composite beam model (300) comprises a concrete box beam section (301), a steel-concrete composite section (302) and a steel box beam section (303) which are connected in sequence. The concrete box beam section (301), the steel-concrete composite section (302) and the steel box beam section (303) are located at the top of the model and are arranged flush with each other. The bottom and top of the model are arranged in a mirror image along a horizontal plane.

6. The test system for composite working conditions of steel-concrete composite beam segments according to claim 5 is characterized in that: The longitudinal loading beam (108) is fixed to the concrete box beam section (301) via a locking device (110), and the longitudinal loading beam (108) is fixedly connected to the steel box beam section (303) via a stiffening plate (107).

7. The test system for composite working conditions of steel-concrete composite beam segments according to claim 6 is characterized in that: The locking device (110) is vertically installed on the side of the longitudinal loading beam (108), and the locking device (110) is fixed to the longitudinal loading beam (108) by welding or bolts, and the stiffening plate (107) is located on the side of the steel box beam section (303).

8. A test system for composite working conditions of steel-concrete composite beam segments according to any one of claims 1 to 3, characterized in that: The bottom of the longitudinal loading beam (108) is supported by a hinge device (110).

9. A method for using a composite working condition test system for a steel-concrete composite beam segment, using the composite working condition test system for a steel-concrete composite beam segment as described in any one of claims 1 to 8 and implementing the same, characterized in that: include: S100, based on the steel-concrete composite beam structure in actual bridge engineering, determine the model size of the half structure located on the central axis in the transverse direction of the bridge. The steel-concrete composite beam segment model (300) should include a concrete box beam segment (301), a steel-concrete composite segment (302) and a steel box beam segment (303); S200, forming a steel-concrete composite beam segment model (300), placing it in a three-dimensional loading device (100), and fixing and installing a sensor system (200); S300, the top load-applying component (106) and the bottom load-applying component (109) apply loads, and the transverse loading beam transmits the applied force to the steel-concrete composite beam segment model (300), so as to realize the steel-concrete composite beam segment model (300) applying longitudinal bridge axial force working condition; S400, the vertical load system (103) applies load, and transmits vertical force to the steel-concrete composite beam segment model (300) through the force transmission beam (104) and the force transmission pad (105), so as to realize the steel-concrete composite beam segment model (300) applying a combined working condition of vertical shear force and bending moment; S500, independently operating the top load-applying component (106) and the bottom load-applying component (109), respectively adjusting the force ratio between the top load-applying component (106) and the bottom load-applying component (109), so as to generate an eccentric force on the steel-concrete composite beam segment model (300), thereby achieving the effect of applying a bending moment working condition to the steel-concrete composite beam segment model (300), and realizing a supplement to the situation where the bearing requirements cannot be met when only the bending moment working condition is applied by the vertical load system (103) or the conditions for applying the vertical load system (103) are not met; S600, the correlation between the applied load and the steel-concrete composite beam segment model (300) subjected to the combined action of axial force, shear force and bending moment; S700, during the load application process, a sensor system (200) fixed on the model monitors the strain, displacement and applied force of the steel-concrete composite beam model (300) in real time, and plots the data into a monitoring data curve.

10. The method for using the composite working condition test system for steel-concrete composite beam segments according to claim 9 is characterized in that: In step S600, the correlation between the applied load and the steel-concrete composite beam segment model (300) subjected to the combined working conditions of axial force, shear force and bending moment is calculated by the following formula: T = T1 + T2; Among them, T represents the axial force condition of the steel-concrete composite beam segment model, Q represents the shear force condition of the model, W represents the bending moment condition of the model, T1 represents the load value at the top of the model, T2 represents the load value at the bottom of the model, T3 represents the vertical load value of the model, L represents the vertical distance between the top and bottom load points of the model, and H represents the longitudinal clear span value of the model.

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