Cast-in-place thin-wall box girder simulation test mechanical property testing device

Abstract

The utility model relates to the technical field of mechanical property testing, and discloses a cast-in-place thin-wall box girder simulation test mechanical property testing device which comprises a base, a stand column is fixedly connected to the top face of the base, a plurality of fixing holes are formed in the outer wall of the stand column, and a supporting column is fixedly connected to the top face of the base. The top surface of the supporting column is fixedly connected with a support, the top surface of the support is provided with a simulation box girder, a reaction frame is slidably connected between two adjacent stand columns, the bottom surface of the reaction frame is fixedly connected with a hydraulic column, the other end of the hydraulic column is fixedly connected with the top surface of the base, and the outer wall of the reaction frame is provided with a limiting groove. The outer wall of the limiting groove is in sliding connection with the outer wall of the stand column. According to the utility model, the simulation box girder is fixed, the real stress environment of the box girder is simulated, and the deformation conditions of the box girder under various different loads can be accurately detected in cooperation with the fiber grating sensors and the strain gauges.

Description

Technical Field

[0001] This utility model relates to the field of mechanical performance testing technology, and in particular to a mechanical performance testing device for a simulated test of cast-in-place thin-walled box girder. Background Technology

[0002] Cast-in-place thin-walled box girders are a widely used structural form in bridge engineering. They consist of a top slab, bottom slab, web, and diaphragms. Compared with traditional box girder structures, thin-walled box girders have the significant advantage of being lightweight, reducing material usage and lowering costs. In long-span bridges, cast-in-place thin-walled box girders can effectively cross wide waters and valley obstacles, demonstrating excellent mechanical properties and structural stability, playing an important role in the construction of modern transportation infrastructure. However, the stress on thin-walled box girders is complex, and the shear lag effect can affect the shear strength and stress at the junction of the web and flange, leading to structural insecurity.

[0003] A search revealed Chinese Patent Publication No. CN217819776U, which discloses a stress simulation testing device for large-span steel box girders. The device includes a stress adding mechanism, with a stress testing mechanism located on its lower side. The stress adding mechanism comprises a sliding measuring mechanism and a set of support positioning plates. Each set of support positioning plates has a ball screw on its upper side, and a limit connecting plate is located on the rear side of the set of support positioning plates. This invention places several welded steel box girder plates on top of a set of rigid support bars, with the connecting weld located in the middle of the upper side of the rigid support bars. A vibrating wire strain gauge is fixed to the upper side of the steel box girder plate via a screw passing through the positioning seat. When the connecting weld of the steel box girder plate is subjected to a specified pressure from a hydraulic cylinder, the steel box girder plate will produce a slight deformation. The stress curve that the steel box girder plate can withstand can be calculated by measuring the deformation measured by the vibrating wire strain gauge and the pressure applied by the hydraulic cylinder. However, this structure cannot simulate the actual stress environment of thin-walled box girders, leading to the neglect of the shear lag effect of thin-walled box girders. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a mechanical performance testing device for simulated test of cast-in-place thin-walled box girders, aiming to improve the problem that the existing technology cannot simulate the real stress environment of thin-walled box girders, which leads to the neglect of the shear lag effect of thin-walled box girders.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a mechanical performance testing device for a cast-in-place thin-walled box girder simulation test, comprising a base, a column fixedly connected to the top surface of the base, multiple fixing holes formed on the outer wall of the column, a support column fixedly connected to the top surface of the base, a support fixedly connected to the top surface of the support column, a simulated box girder set on the top surface of the support, a reaction frame slidably connected between two adjacent columns, a hydraulic column fixedly connected to the bottom surface of the reaction frame, the other end of the hydraulic column fixedly connected to the top surface of the base, a limiting groove formed on the outer wall of the reaction frame, the outer wall of the limiting groove slidably connected to the outer wall of the column, a circular hole formed on the inner wall of the limiting groove, and a loading mechanism set on the outer wall of the reaction frame, the loading mechanism being used to apply pressure to the simulated box girder.

[0006] Through the above technical solution: the base is the basic support part of the entire device, the column is a vertically set structure, and the outer wall has multiple fixing holes along the height direction. The fixing holes facilitate the subsequent installation and adjustment of related auxiliary components. The number and layout of the support columns simulate the size and stress requirements of the box girder. The top surface of the support column is fixedly connected to the support, which is a key component that directly contacts the simulated box girder and simulates the actual stress boundary conditions of the box girder in the test. It can effectively simulate the support state of the box girder in the actual bridge structure. The adjacent columns are slidably connected to the reaction frame. The bottom surface of the reaction frame is fixedly connected to the hydraulic column. The other end of the hydraulic column is fixedly connected to the top surface of the base. The hydraulic column can provide a stable and powerful thrust or pull force for the loading process. The outer wall of the reaction frame is opened with a limit groove. The outer wall of the limit groove is tightly slidably connected to the outer wall of the column, which ensures the smooth movement of the reaction frame in the vertical direction and precisely limits the movement trajectory. The inner wall of the limit groove is opened with a round hole for inserting a positioning pin.

[0007] As a further description of the above technical solution:

[0008] The loading mechanism includes a drive block, the inner wall of which is slidably connected to the outer wall of the reaction frame. A hydraulic actuator is fixedly connected to the middle of the bottom surface of the drive block. The other end of the hydraulic actuator is rotatably connected to a distribution beam via a fixed column. Multiple hydraulic actuators are fixedly connected to the outer wall of the drive block. Each hydraulic actuator has a locking groove at its other end.

[0009] Through the above technical solution: the inner wall of the drive block and the outer wall of the reaction frame are connected by a sliding connection. The sliding connection ensures that the drive block can move smoothly and stably on the reaction frame. A hydraulic actuator is fixedly connected to the middle of the bottom surface of the drive block. The power output unit of the hydraulic actuator can generate precise and controllable linear motion under the drive of hydraulic oil. The other end of the hydraulic actuator is rotatably connected to a distribution beam through a fixed column. The distribution beam plays a key role in load distribution. It is determined according to the stress characteristics of the simulated box girder and the test requirements. Through the rotatable connection with the hydraulic actuator, the distribution beam can reasonably distribute the load to the corresponding parts of the simulated box girder according to its own mechanical balance principle when it is subjected to the thrust or tension of the hydraulic actuator. Multiple hydraulic actuators are fixedly connected to the outer wall of the drive block. The other end of each hydraulic actuator is provided with a locking groove. The locking groove is for cooperating with the distribution beam to realize more complex and diverse loading modes for the simulated box girder.

[0010] As a further description of the above technical solution:

[0011] The top surface of the support has an installation groove, and a limiting block is fixedly connected to the top surface of the support.

[0012] The above technical solution involves carefully creating an installation groove on the top surface of the support, providing the necessary space for subsequent component installation and functional realization. A limiting block is also fixedly connected to the top surface of the support, which effectively restricts the placement of the simulated box girder on the support, preventing excessive horizontal displacement of the simulated box girder during the test and ensuring the accuracy and safety of the test.

[0013] As a further description of the above technical solution:

[0014] A telescopic rod is fixedly connected to the inner wall of the mounting groove, and a locking block is fixedly connected to the other end of the telescopic rod.

[0015] The above technical solution involves a telescopic rod fixedly connected to the inner wall of the mounting groove, with a locking block fixedly connected to the other end of the telescopic rod. The shape and surface of the locking block can contact and fix with the bottom structure of the simulated box girder. When the simulated box girder needs to be fixed, the telescopic rod extends, pushing the locking block to fit tightly with the corresponding structure at the bottom of the simulated box girder, thus achieving a stable support and fixing effect.

[0016] As a further description of the above technical solution:

[0017] A controller is fixedly connected to the outer wall of the column, and the controller is electrically connected to the hydraulic column, hydraulic actuator one, and hydraulic actuator two, respectively.

[0018] The above technical solution involves a controller fixedly connected to the outer wall of the column. The controller is electrically connected to the hydraulic column, hydraulic actuator one, and hydraulic actuator two. The controller can precisely control the extension and retraction of the hydraulic column, thereby adjusting the height and position of the reaction frame. For hydraulic actuator one and hydraulic actuator two, the controller can precisely control the hydraulic oil flow and pressure, thereby achieving precise control of the magnitude, direction, and loading rate of the loading force on the simulated box girder, meeting the requirements for testing the mechanical properties of the simulated box girder under different test conditions.

[0019] As a further description of the above technical solution:

[0020] The fixing hole is slidably connected to the outer wall of the circular hole by a positioning pin, and one end of the positioning pin is fixedly connected to a circular head.

[0021] The above technical solution involves a locating pin that slides between the outer walls of the fixed hole and the round hole. The size of the locating pin matches the size of the fixed hole and the round hole, allowing it to slide smoothly while ensuring sufficient tightness to prevent unnecessary displacement during testing. One end of the locating pin is fixedly connected to a round head, which facilitates the installation and removal of the locating pin. Moreover, the larger diameter effectively prevents the locating pin from sliding completely into the fixed hole and the round hole, avoiding loss or difficulty in removal.

[0022] As a further description of the above technical solution:

[0023] The outer wall of the reaction frame is fixedly connected to a slide rail, and the outer wall of the slide rail is slidably connected to the inner wall of the drive block.

[0024] The above technical solution involves a slide rail fixedly connected to the outer wall of the reaction frame, with the outer wall of the slide rail slidably connected to the inner wall of the drive block, providing precise guidance and stable support for the movement of the drive block on the reaction frame.

[0025] As a further description of the above technical solution:

[0026] Strain gauges are fixedly connected to the outer wall of the simulated box girder, and fiber optic grating sensors are installed inside the simulated box girder.

[0027] The above technical solution involves: strain gauges fixedly connected to the outer wall of the simulated box girder, which are then attached to the mid-span, near the supports, and at variable cross-sections of the simulated box girder. This allows for accurate measurement of the surface strain of the simulated box girder under load. Fiber optic grating sensors are installed inside the simulated box girder to monitor stress, strain, and temperature parameters at different locations within the simulated box girder in real time.

[0028] This utility model has the following beneficial effects:

[0029] 1. In this utility model, the simulated box girder is placed on the support, and the locking block and the limiting block hold the simulated box girder in place. Then, the hydraulic column is activated to move the reaction frame to the appropriate position. The positioning pin is then inserted into the corresponding fixing hole to fix the position of the reaction frame. The middle part of the simulated box girder is suspended, and the two ends are provided with vertical upward force by the support, simulating the real stress environment of the box girder. With the help of fiber optic grating sensors and strain gauges, the deformation of the box girder under various loads can be accurately detected.

[0030] 2. In this utility model, hydraulic actuator one can apply pressure to the simulated box girder through the distribution beam, hydraulic actuator two can simulate multiple loading points, and transfer the load to the simulated box girder through the distribution beam. Multiple sets of loading mechanisms on the reaction frame can simulate the stress points of multiple stress positions. This can more comprehensively present the stress distribution of the simulated box girder under complex loads and accurately depict the stress state of each part of the entire simulated box girder. Attached Figure Description

[0031] Figure 1 This is a front perspective view of a mechanical performance testing device for a simulated test of a cast-in-place thin-walled box girder proposed in this utility model;

[0032] Figure 2 This is a partial structural diagram of the support for a mechanical performance testing device for a simulated test of a cast-in-place thin-walled box girder proposed in this utility model.

[0033] Figure 3 This is a partial structural diagram of the reaction frame of the mechanical performance testing device for a simulated test of cast-in-place thin-walled box girder proposed in this utility model;

[0034] Figure 4 This is a partial structural diagram of the loading mechanism of a mechanical performance testing device for a simulated test of a cast-in-place thin-walled box girder proposed in this utility model;

[0035] Figure 5 This is a partial structural schematic diagram of the positioning pin of the mechanical performance testing device for a simulated test of a cast-in-place thin-walled box girder proposed in this utility model.

[0036] Legend:

[0037] 1. Base; 2. Loading mechanism; 201. Drive block; 202. Hydraulic actuator one; 203. Hydraulic actuator two; 204. Fixed column; 205. Distribution beam; 206. Engaging groove; 3. Column; 4. Support column; 5. Support; 6. Simulated box girder; 7. Reaction frame; 8. Limiting groove; 9. Circular hole; 10. Hydraulic column; 11. Fixing hole; 12. Positioning pin; 13. Controller; 14. Telescopic rod; 15. Locking block; 16. Slide rail; 17. Circular head; 18. Limiting block; 19. Mounting groove. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Please see the appendix Figure 1 - Appendix Figure 3 This utility model provides an embodiment of a mechanical performance testing device for a simulated cast-in-place thin-walled box girder, comprising a base 1, a column 3 fixedly connected to the top surface of the base 1, a plurality of fixing holes 11 formed on the outer wall of the column 3, a support column 4 fixedly connected to the top surface of the base 1, a support 5 fixedly connected to the top surface of the support column 4, a simulated box girder 6 set on the top surface of the support 5, a reaction frame 7 slidably connected between two adjacent columns 3, a hydraulic column 10 fixedly connected to the bottom surface of the reaction frame 7, the other end of the hydraulic column 10 fixedly connected to the top surface of the base 1, a limiting groove 8 formed on the outer wall of the reaction frame 7, the outer wall of the limiting groove 8 slidably connected to the outer wall of the column 3, a circular hole 9 formed on the inner wall of the limiting groove 8, and a loading mechanism 2 set on the outer wall of the reaction frame 7, the loading mechanism 2 being used to apply pressure to the simulated box girder 6;

[0040] Specifically, the base 1 is the basic support part of the entire device, the column 3 is a vertically set structure, and the outer wall has multiple fixing holes 11 along the height direction. The fixing holes 11 facilitate the subsequent installation and adjustment of related auxiliary components. The number and layout of the support columns 4 simulate the size and stress requirements of the box girder 6. The top surface of the support column 4 is fixedly connected to the support 5. The support 5 is a key component that directly contacts the simulated box girder 6 and simulates the actual stress boundary conditions of the box girder 6 in the test. It can effectively simulate the support state of the box girder 6 in the actual bridge structure. A reaction frame 7 is slidably connected between adjacent columns 3. A hydraulic column 10 is fixedly connected to the bottom surface of the reaction frame 7. The other end of the hydraulic column 10 is fixedly connected to the top surface of the base 1. The hydraulic column 10 can provide a stable and powerful thrust or pull force for the loading process. A limit groove 8 is opened on the outer wall of the reaction frame 7. The outer wall of the limit groove 8 is tightly slidably connected to the outer wall of the column 3, which ensures the smooth movement of the reaction frame 7 in the vertical direction and precisely limits the movement trajectory. A circular hole 9 is opened on the inner wall of the limit groove 8. The circular hole 9 is used for insertion and positioning.

[0041] Please see the appendix Figure 3 - Appendix Figure 4The loading mechanism 2 includes a drive block 201. The inner wall of the drive block 201 is slidably connected to the outer wall of the reaction frame 7. A hydraulic actuator 202 is fixedly connected to the middle of the bottom surface of the drive block 201. The other end of the hydraulic actuator 202 is rotatably connected to a distribution beam 205 through a fixed column 204. Multiple hydraulic actuators 203 are fixedly connected to the outer wall of the drive block 201. Each hydraulic actuator 203 has a locking groove 206 at its other end.

[0042] Specifically, the inner wall of the drive block 201 and the outer wall of the reaction frame 7 are slidably connected. This sliding connection ensures that the drive block 201 can move smoothly and steadily on the reaction frame 7. A hydraulic actuator 202 is fixedly connected to the center of the bottom surface of the drive block 201. The hydraulic actuator 202 power output unit can generate precise and controllable linear motion under the drive of hydraulic oil. The other end of the hydraulic actuator 202 is rotatably connected to a distribution beam 205 through a fixed column 204. The distribution beam 205 plays a key role in load distribution. According to the simulation box... The stress characteristics and test requirements of beam 6 are determined. Through rotational connection with hydraulic actuator 202, the distribution beam 205 can distribute the load reasonably to the corresponding parts of the simulated box girder 6 according to its own mechanical balance principle when subjected to the thrust or tension of hydraulic actuator 202. Multiple hydraulic actuators 203 are fixedly connected to the outer wall of the drive block 201. The other end of each hydraulic actuator 203 is provided with a locking groove 206. The locking groove 206 is for cooperating with the distribution beam 205 to realize more complex and diverse loading modes for the simulated box girder 6.

[0043] Please see the appendix Figure 1 - Appendix Figure 3 The top surface of the support 5 is provided with an installation groove 19. A limiting block 18 is fixedly connected to the top surface of the support 5. A telescopic rod 14 is fixedly connected to the inner wall of the installation groove 19. A locking block 15 is fixedly connected to the other end of the telescopic rod 14. A controller 13 is fixedly connected to the outer wall of the column 3. The controller 13 is electrically connected to the hydraulic column 10, the hydraulic actuator 1 202 and the hydraulic actuator 2 203 respectively.

[0044] Specifically, the top surface of the support 5 is carefully provided with an installation groove 19, providing the necessary space for subsequent component installation and functional realization. A limiting block 18 is also fixedly connected to the top surface of the support 5, which effectively restricts the placement position of the simulated box girder 6 on the support 5, preventing excessive horizontal displacement of the simulated box girder 6 during the test, and ensuring the accuracy and safety of the test. A telescopic rod 14 is fixedly connected to the inner wall of the installation groove 19, and a locking block 15 is fixedly connected to the other end of the telescopic rod 14. The shape and surface of the locking block 15 can contact and fix with the bottom structure of the simulated box girder 6. When it is necessary to fix the simulated box girder 6, the telescopic rod 14 extends, pushing the locking block 15 to the simulated box girder 6. The bottom structure of the box girder 6 fits tightly to achieve stable support and fixation. A controller 13 is fixedly connected to the outer wall of the column 3. The controller 13 is electrically connected to the hydraulic column 10, hydraulic actuator 1 202 and hydraulic actuator 2 203 respectively. The controller 13 can accurately control the extension and retraction of the hydraulic column 10, thereby adjusting the height and position of the reaction frame 7. For hydraulic actuator 1 202 and hydraulic actuator 2 203, the controller 13 can accurately control their hydraulic oil flow and pressure, thereby achieving precise control of the magnitude, direction and loading rate of the loading force on the simulated box girder 6, meeting the requirements for mechanical performance testing of the simulated box girder 6 under different test conditions.

[0045] Please see the appendix Figure 3 - Appendix Figure 5 A positioning pin 12 is slidably connected to the outer wall of the fixed hole 11 and the circular hole 9. A circular head 17 is fixedly connected to one end of the positioning pin 12. A slide rail 16 is fixedly connected to the outer wall of the reaction frame 7. The outer wall of the slide rail 16 is slidably connected to the inner wall of the drive block 201. A strain gauge is fixedly connected to the outer wall of the simulated box beam 6. A fiber optic grating sensor is installed inside the simulated box beam 6.

[0046] Specifically, a positioning pin 12 is slidably connected to the outer wall of the fixing hole 11 and the round hole 9. The size of the positioning pin 12 matches the fixing hole 11 and the round hole 9, allowing it to slide smoothly while ensuring sufficient tightness to prevent unnecessary displacement during the test. One end of the positioning pin 12 is fixedly connected to a round head 17. The round head 17 facilitates the installation and removal of the positioning pin 12, and its larger diameter effectively prevents the positioning pin 12 from sliding completely into the fixing hole 11 and the round hole 9, avoiding loss and difficulty in removal. In the reaction frame 7... The outer wall is also fixedly connected to a slide rail 16, and the outer wall of the slide rail 16 is slidably connected to the inner wall of the drive block 201, providing precise guidance and stable support for the movement of the drive block 201 on the reaction frame 7. The outer wall of the simulated box girder 6 is fixedly connected to a strain gauge, which is pasted at the mid-span, near the support 5 and at the variable cross-section of the simulated box girder 6, and can accurately measure the strain on the surface of the simulated box girder 6 when it is subjected to load. A fiber optic grating sensor is installed inside the simulated box girder 6, which can monitor the stress, strain and temperature parameters at different locations inside the simulated box girder 6 in real time.

[0047] Working principle: The simulated box girder 6 is placed on the support 5. The locking block 15 and the limiting block 18 hold the simulated box girder 6 in place, thus fixing it. Then, the hydraulic column 10 is activated to move the reaction frame 7 to the appropriate position. The positioning pin 12 is then inserted into the corresponding fixing hole 11 to fix the position of the reaction frame 7. The middle part of the simulated box girder 6 is suspended, and the two ends are provided with vertical upward force by the support 5, simulating the real stress environment of the box girder. With the help of fiber optic grating sensors and strain gauges, the deformation of the box girder under various loads can be accurately detected.

[0048] Hydraulic actuator 1 202 can apply pressure to the simulated box girder 6 through the distribution beam 205. Hydraulic actuator 203 can simulate multiple loading points and transfer the load to the simulated box girder 6 through the distribution beam 205. Multiple sets of loading mechanisms 2 on the reaction frame 7 can simulate the stress points at multiple stress locations. This can more comprehensively present the stress distribution of the simulated box girder 6 under complex loads and accurately depict the stress state of each part of the entire simulated box girder 6.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mechanical performance testing device for a simulated test of a cast-in-place thin-walled box girder, comprising a base (1), characterized in that: The top surface of the base (1) is fixedly connected to a column (3). The outer wall of the column (3) is provided with multiple fixing holes (11). The top surface of the base (1) is fixedly connected to a support column (4). The top surface of the support column (4) is fixedly connected to a support (5). The top surface of the support (5) is provided with a simulated box girder (6). A reaction frame (7) is slidably connected between two adjacent columns (3). The bottom surface of the reaction frame (7) is fixedly connected to a hydraulic column (10). The other end of the hydraulic column (10) is fixedly connected to the top surface of the base (1). The outer wall of the reaction frame (7) is provided with a limiting groove (8). The outer wall of the limiting groove (8) is slidably connected to the outer wall of the column (3). The inner wall of the limiting groove (8) is provided with a round hole (9). The outer wall of the reaction frame (7) is provided with a loading mechanism (2). The loading mechanism (2) is used to apply pressure to the simulated box girder (6).

2. The mechanical performance testing device for simulated test of cast-in-place thin-walled box girder according to claim 1, characterized in that: The loading mechanism (2) includes a drive block (201), the inner wall of the drive block (201) is slidably connected to the outer wall of the reaction frame (7), a hydraulic actuator (202) is fixedly connected to the middle of the bottom surface of the drive block (201), the other end of the hydraulic actuator (202) is rotatably connected to a distribution beam (205) through a fixed column (204), and a plurality of hydraulic actuators (203) are fixedly connected to the outer wall of the drive block (201), and the other end of each hydraulic actuator (203) is provided with a locking groove (206).

3. The mechanical performance testing device for simulated test of cast-in-place thin-walled box girder according to claim 1, characterized in that: The top surface of the support (5) is provided with an installation groove (19), and a limiting block (18) is fixedly connected to the top surface of the support (5).

4. The mechanical performance testing device for simulated test of cast-in-place thin-walled box girder according to claim 3, characterized in that: The inner wall of the mounting groove (19) is fixedly connected to a telescopic rod (14), and the other end of the telescopic rod (14) is fixedly connected to a locking block (15).

5. The mechanical performance testing device for simulated testing of cast-in-place thin-walled box girders according to claim 1, characterized in that: A controller (13) is fixedly connected to the outer wall of the column (3). The controller (13) is electrically connected to the hydraulic column (10), hydraulic actuator one (202) and hydraulic actuator two (203) respectively.

6. The mechanical property testing device for simulated test of cast-in-place thin-walled box girder according to claim 1, characterized in that: The fixing hole (11) is slidably connected to the outer wall of the round hole (9) by a positioning pin (12), and one end of the positioning pin (12) is fixedly connected to a round head (17).

7. The mechanical property testing device for simulated test of cast-in-place thin-walled box girder according to claim 1, characterized in that: The outer wall of the reaction frame (7) is fixedly connected to a slide rail (16), and the outer wall of the slide rail (16) is slidably connected to the inner wall of the drive block (201).

8. The mechanical property testing device for simulated test of cast-in-place thin-walled box girder according to claim 1, characterized in that: The outer wall of the simulated box girder (6) is fixedly connected with strain gauges, and the interior of the simulated box girder (6) is equipped with fiber optic grating sensors.

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