Simulation test method for fatigue durability of precast T-beams on expressways

Abstract

The present application relates to the technical field of performance simulation test, and in particular to a fatigue durability simulation test method for prefabricated T-beams of highways, including a simulator arranged in the center of a simulation test site, the simulator causing the center of the tire site to perform a circular motion, and simulating the fatigue durability of the prefabricated beams of highways under a long-term vehicle load state by having the tires pass over a number of prefabricated beams; the simulator comprises a bottom plate, a drive shaft is rotatably penetrated on the bottom plate, a number of windows are provided on the bottom plate along the circumference of the drive shaft, a support rod is provided on the drive shaft, a connecting frame is provided at one end of the support rod, and a sliding groove is provided on the connecting frame, when the connecting frame of the present invention rotates around the support column, the connecting ring will drive the load wheels to roll on the number of prefabricated beams through the sliding block, to simulate the fatigue durability of the prefabricated beams of highways under a long-term vehicle load state.

Description

Technical Field

[0001] The present application relates to the technical field of performance simulation testing, and in particular to a fatigue durability simulation test method for prefabricated T-beams of highways. Background Art

[0002] Precast T-beam is a kind of precast component commonly used in highway bridge construction. Its cross-section is T-shaped and consists of ribs (also called webs) and flanges (also called flanges). The ribs mainly bear shear forces, while the flanges mainly bear bending moments. This unique T-shaped cross-section design enables the beam to disperse the load more effectively when subjected to stress, thereby improving the overall bearing capacity. The cross-sectional size and reinforcement of precast T-beams are usually customized according to the design load and span of the bridge to meet the needs of different projects.

[0003] In actual use, the T-beam will be subjected to repeated effects of vehicle loads for a long time. This cyclic load may cause fatigue damage to the material, thereby affecting the overall performance of the structure. Therefore, it is very important to conduct fatigue durability simulation tests. For example, a performance testing device for a prefabricated beam with a publication number of CN118150344B relates to the field of performance testing technology. The prior art includes a working frame, the working frame is slidably connected to a load-bearing plate, the load-bearing plate is fixedly connected to the telescopic end of the first electric push rod, the load-bearing plate is horizontally slidably connected to a U-shaped pull plate symmetrically along the center of the load-bearing plate, the U-shaped pull plate is vertically slidably connected to a pull frame symmetrically distributed along the longitudinal direction of the U-shaped pull plate, the pull frame is slidably connected to the working frame, and support blocks are horizontally slidably connected between the longitudinally adjacent pull frames. The distance between the two support blocks is adjusted by multiple synchronous scaling to change the support point position of the prefabricated beam. In this way, when the prefabricated beam is subjected to load testing, the load performance of the prefabricated beam under different deflection conditions can be tested at multiple points, or the load performance of the prefabricated beam under different shear stress and bending stress conditions can be tested at multiple points, so that the test results are more representative and have more reference value.

[0004] However, the above-mentioned prior art still has some defects in the simulation test of precast beams:

[0005] In an actual highway environment, the load on the precast beam mainly comes from vehicles traveling on the road above. This load is dynamic and continuously changing. The above-mentioned prior art uses a first electric push rod to load the precast beam in a concentrated manner, and applies concentrated force at a specific point through a U-shaped pull plate. This loading method is significantly different from the distributed load caused by vehicles traveling on the actual road.

[0006] At the same time, the above-mentioned prior art performs multiple load performance tests on the precast beams through repeated loading and adjustment processes to evaluate their bearing capacity under different deflection conditions. This can only simulate static and fixed position loads, and cannot truly reflect the dynamic changes of loads during vehicle driving, that is, the load distribution of the precast beams will change with the position and weight of the vehicle.

[0007] In addition, in actual use, precast beams will undergo long-term load cycles, causing gradual fatigue damage to the internal materials, which may eventually lead to fracture or failure. The equipment conducts multiple load performance tests through repeated loading and adjustment, but the number of load cycles between each test is limited, and it is impossible to simulate the fatigue state of precast beams after long-term use.

[0008] Based on this, and in accordance with the above-mentioned viewpoints, there is still room for improvement in the existing technology for simulation testing of precast beams. Summary of the invention

[0009] In order to solve the above technical problems, the present application provides a fatigue durability simulation test method for prefabricated T-beams of highways, which adopts the following technical solutions:

[0010] The fatigue durability simulation test method of the prefabricated T-beam of the expressway includes the following steps:

[0011] Step S1: simulate the fatigue durability of a highway precast beam under a long-term vehicle load. The precast beam has a T-shaped cross section and is composed of vertical ribs and horizontal wing plates. The ribs bear shear force, while the wing plates bear bending moment.

[0012] Step S2: a simulation test site is opened, a plurality of receiving grooves are arranged in a circular shape in the site, precast beams of the highway are placed in the receiving grooves, and the precast beams are fixed in the receiving grooves so that the top of the wing plate is flush with the ground, and the plurality of precast beams are distributed in a circular shape around the center of the site;

[0013] Step S3: a simulator is set up in the center of the site, and the simulator makes the tire do a circular motion around the center of the site, and the tire passes over a number of prefabricated beams to simulate the fatigue durability of the prefabricated beams under the condition of long-term vehicle load;

[0014] Step S4: When the tire passes over the prefabricated beam, the simulator continuously changes the load weight of the tire to truly reflect the dynamic change of the load during the vehicle driving process;

[0015] The simulator comprises a bottom plate, a driving shaft is rotatably passed through the bottom plate, a plurality of windows are opened on the bottom plate along the circumference of the driving shaft, a support rod is arranged on the driving shaft, a connecting frame is arranged at one end of the support rod, and a sliding groove is opened on the connecting frame.

[0016] Preferably, the simulator further comprises a sliding block slidably arranged in the sliding groove, a load wheel is rotatably arranged on the sliding block, and the load wheel is located directly above the window.

[0017] Preferably, load springs are provided at both ends of the sliding block.

[0018] Preferably, an adjusting block located above the sliding block is slidably disposed in the sliding groove, and one of the load springs is located between the adjusting block and the sliding block.

[0019] Preferably, an adjusting rod connected to the adjusting block is slidably penetrated on the support rod, a reciprocating thread groove is provided on the adjusting rod, and a driving pulley threadably connected to the reciprocating thread groove is rotatably provided on the support rod.

[0020] Preferably, a transmission shaft is rotatably provided on the support rod, a transmission pulley is provided on the transmission shaft, and a transmission belt is sleeved between the transmission pulley and the driving pulley.

[0021] Preferably, a support column coaxial with the drive shaft is provided on the base plate, and the drive shaft is rotatably connected to the support column, an adjusting gear ring is provided on the support column, and a transmission gear meshing with the adjusting gear ring is provided on the transmission shaft.

[0022] Preferably, a displacement member is provided on the bottom plate;

[0023] The displacement member comprises a sliding base which is slidably arranged at the lower end of the bottom plate and corresponds to the windows one by one, and a slot corresponding to the rib plate is provided on the sliding base.

[0024] Preferably, a screw rod corresponding to the sliding base one by one is rotatably provided at the lower end of the base plate through a bracket, a driving bevel gear is provided on the driving shaft, and a transmission bevel gear meshing with the driving bevel gear is provided on the screw rod.

[0025] Preferably, a reciprocating thread segment is provided on the screw rod, and the reciprocating thread segment is threadedly connected to the sliding base.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. When the connecting frame of the present invention rotates around the support column, the connecting ring will drive the load wheel to roll on a number of prefabricated beams through the sliding block to simulate the fatigue durability of the prefabricated beams of the highway under the condition of long-term vehicle load.

[0028] 2. The adjusting rod of the present invention will drive the adjusting block to move up and down in the sliding groove. Since one of the load springs is located between the adjusting block and the sliding block, the moving adjusting block will continuously change the elastic force of the two load springs, so that the downward pressure of the load wheel will continuously change, so as to realize the continuous change of the load weight of the load wheel, and truly reflect the dynamic change of the load during the driving process of the vehicle. This design can simulate the dynamic change of the load during the driving process of the vehicle, which is consistent with the inertial load characteristics experienced by the actual vehicle under different road conditions.

[0029] 3. The present invention drives the sliding base to move back and forth, and drives the prefabricated beam to move back and forth through the sliding base. By coordinating with the continuous change of the load weight of the load wheel, the load distribution of the prefabricated beam is simulated to change with the position and weight of the vehicle.

[0030] 4. The connecting rod rotating around the driving shaft of the present invention will drive the connecting block, so that the connecting block drives the load-bearing wheels to roll on a plurality of prefabricated beams. The plurality of load-bearing wheels will increase the frequency and number of cycles of the load borne by the prefabricated beams, simulating the fatigue state of the prefabricated beams after long-term use.

[0031] 5. The rotating adjusting gear of the present invention will drive the connecting shaft to move up and down by cooperating with the reciprocating spiral section, and the connecting shaft will drive the clamping block to move together. The moving clamping block will continuously change the elastic force of the two load-bearing springs, so that the downward pressure of the load-bearing wheel will continuously change, so as to realize the continuous change of the load weight of the load-bearing wheel, and further reflect the dynamic change of the load during the driving process of the real vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the prefabricated beam of the present invention.

[0033] Figure 2 It is a structural schematic diagram of the present invention.

[0034] Figure 3 It is a structural schematic diagram of the simulator of the present invention.

[0035] Figure 4 It is a schematic diagram of the structure among the support rod, the connecting frame, the sliding block and the load wheel of the present invention.

[0036] Figure 5 It is a schematic diagram of the structure among the drive shaft, support column, adjustment gear ring and transmission gear of the present invention.

[0037] Figure 6 It is a bottom view of the displacement member of the present invention.

[0038] Figure 7 The present invention Figure 6 A partial enlarged view of point A in the middle.

[0039] Figure 8It is a structural schematic diagram of the sliding base of the present invention.

[0040] Fig. 9 It is a schematic diagram of the structure of the simulation part of the present invention.

[0041] Fig.10 The present invention Fig. 9 A partial enlarged view of point B in the middle.

[0042] Fig.11 The present invention Fig. 9 A partial enlarged view of point C in the middle.

[0043] Fig.12 The present invention Fig. 9 A partial enlarged view of point D in the middle.

[0044] Fig.13 It is a schematic diagram of the structure between the connecting block, the sliding block and the bearing wheel of the present invention.

[0045] Description of reference numerals: 1. precast beam; 11. rib plate; 12. wing plate; 2. stiffener; 3. simulator; 31. bottom plate; 311. window; 32. drive shaft; 321. support rod; 33. connecting frame; 331. sliding groove; 332. sliding block; 34. load wheel; 341. load spring; 35. adjustment block; 351. adjustment rod; 352. reciprocating thread groove; 36. drive pulley; 37. transmission shaft; 371. transmission pulley; 38. transmission belt; 39. support column; 391. adjustment gear ring; 392. transmission gear; 4. Displacement member; 41. Sliding base; 42. Slot; 43. Positioning slot; 44. Screw rod; 45. Driving bevel gear; 46. Transmission bevel gear; 47. Reciprocating threaded section; 5. Simulation member; 51. Connecting ring; 511. Transmission gear disc; 512. Driving gear disc; 513. Connecting gear; 52. Connecting rod; 53. Connecting block; 531. Sliding groove; 532. Sliding block; 54. Load-bearing wheel; 55. Load-bearing spring; 56. Pressing block; 57. Connecting shaft; 571. Reciprocating spiral section; 58. Adjusting gear; 59. Arc rack. DETAILED DESCRIPTION

[0046] The following is combined with Figures 1 to 13 This application is described in further detail.

[0047] The embodiment of the present application discloses a fatigue durability simulation test method for prefabricated T-beams of highways. The simulator makes the center of the tire field do a circular motion, and the tire passes over a number of prefabricated beams to simulate the fatigue durability of the prefabricated beams of highways under long-term vehicle load conditions. When the tire passes over the prefabricated beams, the simulator continuously changes the load weight of the tire to truly reflect the dynamic changes of the load during vehicle driving.

[0048] Embodiment 1:

[0049] The fatigue durability simulation test method of the prefabricated T-beam of the expressway includes the following steps:

[0050] Step S1: simulate the fatigue durability of a highway prefabricated beam 1 under long-term vehicle load conditions. The prefabricated beam 1 has a T-shaped cross-section and consists of vertical ribs 11 and horizontal wing plates 12. The ribs 11 mainly bear shear forces, while the wing plates 12 mainly bear bending moments, and a number of uniformly distributed reinforcing ribs 2 are arranged on both sides of the ribs 11 and between the wing plates 12.

[0051] Step S2: Open up a suitable simulation test site, set up a number of accommodating grooves in a circular shape in the site, place the precast beams 1 of the highway in the accommodating grooves, and fix the precast beams 1 in the accommodating grooves so that the top of the wing plate 12 is flush with the ground, and let the precast beams 1 be distributed in a circular shape with the center of the site.

[0052] Step S3: A simulator 3 is set in the center of the site. The simulator 3 makes the tire move around the center of the site. The tire passes on a number of precast beams 1 to simulate the fatigue durability of the highway precast beams 1 under long-term vehicle load conditions.

[0053] Step S4: When the tire passes over the prefabricated beam 1, the simulator 3 will continuously change the load weight of the tire to truly reflect the dynamic change of the load during the vehicle driving process.

[0054] Step S5: The simulator 3 will continuously change the position of the precast beam 1 so that the passing position of the tire on the precast beam 1 will continuously change, simulating that the load distribution of the precast beam 1 changes with the position and weight of the vehicle.

[0055] Step S6: by providing a plurality of tires, the frequency and the number of cycles of the load borne by the prefabricated beam 1 are increased, so as to simulate the fatigue state of the prefabricated beam 1 after long-term use.

[0056] Reference Figure 1 , Figure 2 and Figure 3 As shown, specifically, the simulator 3 comprises a bottom plate 31 , a driving shaft 32 is rotatably penetrated through the bottom plate 31 , and a plurality of windows 311 are opened on the bottom plate 31 along the circumference of the driving shaft 32 .

[0057] The bottom plate 31 is located at the top of the accommodating groove. When performing a durability simulation test on the precast beam 1, the precast beam 1 is first placed in the window 311, and several precast beams 1 are distributed in a circumferential ring around the driving shaft 32, so that the wing plate 12 of the precast beam 1 is flush with the upper end of the bottom plate 31, and then the driving shaft 32 is driven to rotate by the existing driving technology. The rotating driving shaft 32 will drive the support rod 321 set on the driving shaft 32, and the support rod 321 drives the connecting frame 33 set at one end thereof, so that the connecting frame 33 rotates around the supporting column 39.

[0058] The connecting frame 33 is provided with a sliding groove 331, in which a sliding block 332 is slidably arranged, and a load wheel 34 is rotatably arranged on the sliding block 332. Since the load wheel 34 is located directly above the window 311, when the connecting frame 33 rotates around the support column 39, the connecting ring 51 will drive the load wheel 34 to roll on a plurality of prefabricated beams 1 through the sliding block 332, so as to simulate the fatigue durability of the prefabricated beams 1 of the highway under the condition of long-term vehicle load.

[0059] Reference Figure 3 , Figure 4 and Figure 5 As shown, load springs 341 are provided at both ends of the sliding block 332, an adjusting block 35 located above the sliding block 332 is slidably provided in the sliding groove 331, an adjusting rod 351 connected to the adjusting block 35 is slidably penetrated on the support rod 321, a reciprocating thread groove 352 is provided on the adjusting rod 351, a support column 39 coaxial with the driving shaft 32 is provided on the bottom plate 31, and the driving shaft 32 is rotatably connected to the support column 39.

[0060] When the load wheel 34 rolls on the precast beams 1, the rotating support rod 321 will drive the transmission shaft 37 that is rotatably installed thereon, and the transmission shaft 37 will drive the transmission gear 392 installed thereon. The transmission gear 392 drives the transmission shaft 37 to rotate by meshing with the adjusting gear ring 391 installed on the support column 39. The rotating transmission shaft 37 will drive the transmission pulley 371 installed on the transmission shaft 37 to rotate together. A transmission belt 38 is sleeved between the transmission pulley 371 and the driving pulley 36. The transmission belt 38 drives the driving pulley 36 that is rotatably installed on the support rod 321 to rotate. The rotating driving pulley 36 will drive the adjusting rod 351 to move up and down by threaded connection with the reciprocating thread groove 352.

[0061] The moving adjustment rod 351 will drive the adjustment block 35 to move back and forth up and down in the sliding groove 331. Since one of the load springs 341 is located between the adjustment block 35 and the sliding block 332, the moving adjustment block 35 will continuously change the elastic force of the two load springs 341, so that the downward pressure of the load wheel 34 will continue to change, so as to realize the continuous change of the load weight of the load wheel 34, and truly reflect the dynamic change of the load during the driving process of the vehicle.

[0062] Reference Figure 6 , Figure 7 and Figure 8 As shown, a displacement member 4 is provided on the bottom plate 31, and the displacement member 4 will continuously change the precast beam 1, so that the passing position of the load wheel 34 on the precast beam 1 is continuously changed, simulating that the load distribution of the precast beam 1 changes with the position and weight of the vehicle.

[0063] Specifically, the displacement member 4 includes a sliding base 41 slidably arranged at the lower end of the bottom plate 31 and corresponding to the window 311, a slot 42 corresponding to the rib 11 is provided on the sliding base 41, and positioning slots 43 corresponding to the reinforcing rib 2 are provided on both sides of the slot 42, and a screw rod 44 corresponding to the sliding base 41 is rotatably arranged at the lower end of the bottom plate 31 through a bracket.

[0064] When performing a durability simulation test on the precast beam 1 , the precast beam 1 is first placed in the window 311 , the ribs 11 are inserted into the slots 42 , and the reinforcing ribs 2 are inserted into the positioning slots 43 , so as to fix the precast beam 1 .

[0065] When the driving shaft 32 rotates, the driving shaft 32 will drive the driving bevel gear 45 provided thereon to rotate together, and the rotating driving bevel gear 45 will drive the screw rod 44 to rotate by meshing with the transmission bevel gear 46 provided on the screw rod 44, and the rotating screw rod 44 will drive the reciprocating thread segment 47 provided thereon, and the reciprocating thread segment 47 is threadedly connected with the sliding base 41 to drive the sliding base 41 to reciprocate, and the precast beam 1 is driven to reciprocate through the sliding base 41, and the transmission bevel gear 46 is meshed with the screw rod 44 to drive the screw rod 44 to rotate, and the reciprocating thread segment 47 on the screw rod 44 is threadedly connected with the sliding base 41, so that the sliding base 41 and the precast beam 1 reciprocate.

[0066] By coordinating the continuous change of the load weight of the load wheel 34, the load distribution of the simulated precast beam 1 changes with the position and weight of the vehicle.

[0067] Embodiment 2:

[0068] Reference Fig. 9 , Fig.10 , Fig.11 , Fig.12 and Fig.13 As shown, on the basis of the first embodiment, a simulation component 5 is provided on the support column 39, and the simulation component 5 simulates the fatigue state of the prefabricated beam 1 after long-term use by increasing the frequency and number of cycles of the load borne by the prefabricated beam 1.

[0069] Specifically, the simulation component 5 includes a connecting ring 51 rotatably arranged on the support column 39, a transmission gear plate 511 is arranged on the connecting ring 51, a driving gear plate 512 is arranged on the driving shaft 32, a connecting gear 513 rotatably arranged on the support column 39 and meshing with the transmission gear plate 511 and the driving gear plate 512, and a plurality of connecting rods 52 evenly arranged circumferentially are arranged on the connecting ring 51.

[0070] When the driving shaft 32 rotates, it will drive the driving sprocket 512 to rotate together. The rotating driving sprocket 512 will drive it to rotate by meshing with the connecting gear 513. The rotating connecting gear 513 will drive the connecting ring 51 to rotate by meshing with the transmission sprocket 511. The rotating connection will drive the plurality of connecting rods 52 to rotate around the driving shaft 32. The driving sprocket 512 meshes with the connecting gear 513, thereby driving the connecting gear 513 to rotate. The connecting gear 513 then meshes with the transmission sprocket 511, causing the connecting ring 51 to rotate accordingly. Finally, the rotation of the connecting ring 51 drives the plurality of connecting rods 52 to rotate around the driving shaft 32.

[0071] A connecting block 53 is provided at one end of the connecting rod 52, and a sliding groove 531 is opened on the connecting block 53. A sliding block 532 is slidably arranged in the sliding groove 531, and a load-bearing wheel 54 is rotatably arranged on the sliding block 532. Load-bearing springs 55 are provided at both ends of the sliding block 532. A tightening block 56 located above the sliding block 532 is slidably arranged in the sliding groove 531, and one of the load-bearing springs 55 is located between the tightening block 56 and the sliding block 532.

[0072] The connecting rod 52 rotating around the driving shaft 32 will drive the connecting block 53, so that the connecting block 53 drives the load-bearing wheels 54 to roll on the plurality of prefabricated beams 1. The plurality of load-bearing wheels 54 will increase the frequency and number of cycles of the load borne by the prefabricated beams 1, simulating the fatigue state of the prefabricated beams 1 after long-term use.

[0073] Among them, a connecting shaft 57 is slidably penetrated on the connecting block 53, a reciprocating spiral section 571 is arranged on the connecting shaft 57, an adjusting gear 58 threadedly connected to the reciprocating spiral point is rotatably arranged on the connecting block 53, and an arc-shaped rack 59 meshing with the adjusting gear 58 is arranged on the support rod 321 through a bracket.

[0074] When the support rod 321 rotates around the driving shaft 32, the support rod 321 will drive the arc-shaped rack 59, so that the arc-shaped rack 59 is meshed with a plurality of adjusting gears 58 in sequence, driving the plurality of adjusting gears 58 to rotate in sequence, and the rotating adjusting gear 58 will drive the connecting shaft 57 to move back and forth up and down through the cooperation with the reciprocating spiral section 571, and the connecting shaft 57 will drive the clamping block 56 to move together, and the moving clamping block 56 will continuously change the elastic force of the two load-bearing springs 55, so that the downward pressure of the load-bearing wheel 54 will continuously change, so as to realize the continuous change of the load weight of the load-bearing wheel 54, further reflecting the dynamic change of the load during the driving process of the real vehicle.

[0075] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The fatigue durability simulation test method of prefabricated T-beams for expressways is characterized by: The following steps are involved: Step S1: simulate the fatigue durability of a highway prefabricated beam (1) under a long-term vehicle load condition, wherein the prefabricated beam (1) has a T-shaped cross section and is composed of a vertical rib plate (11) and a horizontal wing plate (12), wherein the rib plate (11) bears shear force and the wing plate (12) bears bending moment; Step S2: opening a simulation test site, setting a plurality of receiving grooves in a circular shape in the site, placing the precast beams (1) of the expressway in the receiving grooves, and fixing the precast beams (1) in the receiving grooves so that the top of the wing plate (12) is flush with the ground, and allowing the plurality of precast beams (1) to be distributed in a circular shape around the center of the site; Step S3: a simulator (3) is arranged in the center of the site, and the simulator (3) causes the tire to move around the center of the site, and the tire passes over a plurality of prefabricated beams (1) to simulate the fatigue durability of the prefabricated beams (1) under a long-term vehicle load state; Step S4: When the tire passes over the prefabricated beam (1), the simulator (3) continuously changes the load weight of the tire to truly reflect the dynamic change of the load during the vehicle driving process; The simulator (3) comprises a bottom plate (31), a driving shaft (32) rotatably penetrates the bottom plate (31), a plurality of windows (311) are provided on the bottom plate (31) along the circumference of the driving shaft (32), a support rod (321) is provided on the driving shaft (32), a connecting frame (33) is provided at one end of the support rod (321), and a sliding groove (331) is provided on the connecting frame (33); The simulator (3) further comprises a sliding block (332) slidably arranged in the sliding groove (331), a load wheel (34) being rotatably arranged on the sliding block (332), the load wheel (34) being located directly above the window (311), and load springs (341) being arranged at both ends of the sliding block (332); An adjusting block (35) located above the sliding block (332) is slidably disposed in the sliding groove (331), wherein one of the load springs (341) is located between the adjusting block (35) and the sliding block (332); An adjusting rod (351) connected to the adjusting block (35) is slidably penetrated on the support rod (321), a reciprocating thread groove (352) is provided on the adjusting rod (351), and a driving pulley (36) threadably connected to the reciprocating thread groove (352) is rotatably provided on the support rod (321).

2. The fatigue durability simulation test method for prefabricated T-beams of highways according to claim 1 is characterized in that: A transmission shaft (37) is rotatably mounted on the support rod (321), a transmission pulley (371) is disposed on the transmission shaft (37), and a transmission belt (38) is sleeved between the transmission pulley (371) and the driving pulley (36).

3. The fatigue durability simulation test method for prefabricated T-beams of highways according to claim 2 is characterized in that: A support column (39) coaxial with the drive shaft (32) is provided on the bottom plate (31), and the drive shaft (32) is rotatably connected to the support column (39), an adjustment gear ring (391) is provided on the support column (39), and a transmission gear (392) meshing with the adjustment gear ring (391) is provided on the transmission shaft (37).

4. The fatigue durability simulation test method for prefabricated T-beams of highways according to claim 1 is characterized in that: The bottom plate (31) is provided with a displacement member (4); The displacement member (4) comprises a sliding base (41) slidably arranged at the lower end of the bottom plate (31) and corresponding to the window (311) one by one, and a slot (42) corresponding to the rib plate (11) is provided on the sliding base (41).

5. The fatigue durability simulation test method for prefabricated T-beams of highways according to claim 4 is characterized in that: A screw rod (44) corresponding to the sliding base (41) is rotatably arranged at the lower end of the base plate (31) through a bracket, a driving bevel gear (45) is arranged on the driving shaft (32), and a transmission bevel gear (46) meshing with the driving bevel gear (45) is arranged on the screw rod (44).

6. The fatigue durability simulation test method for prefabricated T-beams of highways according to claim 5 is characterized in that: The screw rod (44) is provided with a reciprocating thread segment (47), and the reciprocating thread segment (47) is threadedly connected to the sliding base (41).

Images