A test apparatus and method for multi-point synchronous multi-condition loading of steel-concrete composite arch ribs

Abstract

This invention belongs to the field of arch rib loading test technology, specifically a multi-point synchronous multi-condition loading test device and method for steel-concrete composite arch ribs, including a tie beam, a fixed base, a reaction frame, and a loading component. The loading component includes a reaction beam, which is fixedly connected to the reaction frame. A load sensor and a bidirectional jack are sequentially installed on the lower side of the reaction beam. An enclosure is provided below the bidirectional jack. An enclosure hole is opened inside the enclosure. The enclosure hole is inclined, and the arch specimen passes through the enclosure hole. During the experiment, the arch specimen is sequentially passed through the enclosure holes of each enclosure. The loading component at each position can be controlled by extending or shortening the bidirectional jack, and pressure, tension, or alternating load is applied to the arch specimen using the enclosure, realizing multi-point synchronous and multi-condition loading tests, fully simulating real arch bridge application scenarios.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of arch rib loading test, in particular to a steel pipe concrete arch rib multi-point synchronous multi-working condition loading test device and method. BACKGROUND

[0002] As a widely used structure form in modern bridge engineering, the arch rib of the steel pipe concrete arch bridge bears complex load working conditions formed by the combined action of vehicle, wind load and temperature change and other factors in actual operation. These loads not only show the alternating action of multi-point compression and tension, but also often accompany dynamic response and local vibration effect. In order to accurately simulate such complex stress state in the experimental environment, a special test device for the steel pipe concrete arch rib is needed to scientifically reproduce the real mechanical behavior of the arch rib structure and provide reliable basis for the safety and durability evaluation of the structure.

[0003] A patent of Chinese patent application CN116858468A discloses a large-tonnage multi-working condition vertical loading system of arch, the technical solution of which is as follows: including an arch rib, the two ends of the arch rib are provided with arch seats for fixing the arch rib to the bottom surface, at least one set of loading systems is arranged on the arch rib, the loading system includes a plurality of arch rib clamps sleeved on the arch rib, the contact part of the arch rib clamp and the arch rib is provided with a limiting mechanism for limiting the position of the arch rib clamp, the lower end of the arch rib clamp is provided with a plurality of first vertical pulleys arranged side by side; a first fixed seat fixedly connected with the bottom surface is arranged below the arch rib clamp, the first fixed seat is provided with a plurality of second vertical pulleys arranged side by side, and the first vertical pulley and the second pulley are wound with a steel wire rope.

[0004] The core defect of the current test device for the in-plane stability research of the steel pipe concrete arch is the singleness of the loading mode and the disconnection with the real stress working condition. The existing technology generally relies on hydraulic jacks and other equipment to apply vertical pressure to the arch rib to simulate dead load and static load working conditions, but this is significantly different from the dynamic stress state of the arch bridge in actual operation. When the vehicle and other live loads pass through the bridge, complex dynamic effects will be generated on the arch structure, causing the specific areas of the arch (such as the arch foot and the vicinity of the quarter point) to bear the cyclic stress of alternating tension and compression. However, the existing device does not have the condition to simulate tensile or alternating tensile and compressive load, which makes the test research seriously insufficient, cannot reveal the material properties of the steel pipe concrete arch under tensile force, the section cracking behavior and the tensile synergistic working mechanism of the steel pipe and concrete interface, and cannot evaluate the long-term performance, stiffness degradation law and dynamic stability of the structure under fatigue load, which makes it difficult for the test conclusion to fully reflect the real bearing capacity and failure mechanism of the structure, and restricts the further improvement of the design theory and the precise evaluation of the engineering safety.

[0005] To this end, the application provides a kind of steel pipe concrete arch rib multi-point synchronous multi-working condition loading test device and method. SUMMARY

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical scheme adopted by the application to solve its technical problems is: a kind of steel pipe concrete arch rib multi-point synchronous multi-working condition loading test device, comprising a pair of pull beams, a fixed seat, a counterforce frame and a loading assembly;

[0008] The fixed seat is provided with a pair of and is fixedly connected to the two ends of the pull beam, and the counterforce frame is provided with a group and is evenly distributed above the pull beam.

[0009] The loading assembly is provided with a group and is arranged between the counterforce frames respectively, and the loading assembly is used for loading test on the arch test piece.

[0010] The loading assembly comprises a counterforce beam, the counterforce beam is fixedly connected with the counterforce frame, the underside of the counterforce beam is sequentially provided with a load sensor and a bidirectional jack, the underside of the bidirectional jack is provided with an enclosing piece, the enclosing piece is internally provided with an enclosing hole, the enclosing hole is designed to be inclined, and the arch test piece passes through the inside of the enclosing hole.

[0011] Preferably, the underside of the bidirectional jack is fixedly connected with a support frame, the inside of the support frame is fixedly connected with a group of guide rods, the top of the enclosing piece is provided with a connecting piece, the guide rods penetrate through the connecting piece and are slidingly connected therewith, the enclosing piece and the connecting piece are designed to be half-separated, and a hydraulic cylinder is fixedly connected between the connecting piece and the support frame.

[0012] Preferably, a group of rollers are evenly distributed in the inside of the enclosing hole, and the rollers are distributed on the upper and lower sides of the arch test piece and are in close contact therewith.

[0013] Preferably, a group of sliding grooves are formed in the inside of the enclosing piece, a sliding block is arranged in the inside of the sliding groove, a connecting rod is fixedly connected to one side of the sliding block, a compression spring is fixedly connected between the other side of the sliding block and the sliding groove, one end of the connecting rod extending into the inside of the enclosing hole is fixedly connected with a bracket, and the rollers are rotatably connected with the bracket.

[0014] Preferably, the sliding block and the sliding groove are slidingly and sealingly matched, a hollow shaft is fixedly connected in the inside of the bracket, the hollow shaft penetrates through the rollers and is rotatably and sealingly matched therewith, a conduit is communicated with the hollow shaft, and the other end of the conduit extends to the surface of the sliding block, the rollers are designed to be hollow structures and are communicated with the hollow shaft, and a group of slits are evenly distributed on the surface of the rollers.

[0015] Preferably, the hollow shaft is fixedly connected with a baffle cover on one side close to the arch test piece, and the baffle cover is located inside the roller.

[0016] Preferably, a plurality of limiting rollers are uniformly distributed inside the surrounding hole; the limiting rollers are distributed on the horizontal two sides of the arch test piece and are in close contact with the arch test piece.

[0017] Preferably, a limiting frame is arranged between the limiting roller and the surrounding piece; end plates and combination columns are fixedly connected at two ends of the limiting frame; the limiting roller is designed as a hollow structure, and a combination ring is arranged inside both ends of the limiting roller; an elastic connecting ring is fixedly connected between the combination ring and the limiting roller; the combination ring is sleeved outside the combination column and is in rotational cooperation with the combination column; a motor is fixedly connected to the surface of the combination column; a wheel disc is connected to the output shaft of the motor; a plurality of spring rods and guide balls are uniformly distributed on the surface of the wheel disc; and a plurality of spring sheets are uniformly distributed on the inner side of the limiting roller.

[0018] The steel pipe concrete arch rib multi-point synchronous multi-working condition loading test method provided by the application adopts the steel pipe concrete arch rib multi-point synchronous multi-working condition loading test device, and comprises the following steps:

[0019] S1, the arch test piece is arranged between a plurality of counterforce frames, the two ends of the arch test piece are fixedly connected with the fixed seats, the hydraulic cylinders of the loading assemblies are controlled to be elongated, the connecting pieces and the surrounding pieces are pushed to be close to each other, and the arch test piece is placed inside the surrounding hole;

[0020] S2, the PLC oil circuit system is used to control the synchronous work of the bidirectional jacks at different positions, the surrounding piece is driven to move relative to the arch test piece, and the vertical load is continuously applied to the arch test piece;

[0021] S3, when the arch test piece deforms in the arch plane under the action of the load, the roller flexibly rotates, the compression spring is adaptively compressed, the roller fully adheres to and adapts to the deformation degree of the arch test piece;

[0022] S4, the limiting rollers are used to form lateral restraint on the arch test piece, so that the test piece is prevented from deforming out of the arch plane, and when the test piece deforms in the arch plane, the limiting rollers rotate to adapt to the deformation degree;

[0023] S5, the motor inside the limiting roller drives the wheel disc and the spring rod and the guide ball to rotate, the guide ball continuously hits the surface of the spring sheet, and the spring sheet generates a shaking effect;

[0024] S6, the shaking effect of the spring sheet is transmitted to the arch test piece through the limiting roller, so that the limiting roller can apply a continuous and controllable micro-vibration to the arch test piece, and the real stress state of the arch bridge under complex environmental excitation is restored.

[0025] The beneficial effects of the application are as follows:

[0026] 1. The steel pipe concrete arch rib multi-point synchronous multi-working condition loading test device and method, a plurality of independent loading assemblies are uniformly distributed on the tension beam, each assembly integrates a counter-force beam, a load sensor and a bidirectional jack, and a uniquely designed surrounding piece is matched, so that a multi-point synchronous loading system is constructed, the arch test piece is sequentially inserted into the surrounding holes of the surrounding pieces during the test, the loading assemblies at each position can be elongated or shortened by controlling the bidirectional jacks, pressure, tension or alternating load is applied to the arch test piece by the surrounding pieces, multi-point synchronous and multi-working condition loading test are realized, and the actual arch bridge application scene is fully simulated.

[0027] 2. The steel pipe concrete arch rib multi-point synchronous multi-working condition loading test device and method, the surrounding piece and the connecting piece are designed as a separable and foldable half structure, which is more conducive to actual operation, the hydraulic cylinder is controlled to shrink, a pair of connecting pieces and surrounding pieces are driven to separate from each other, then the arch test piece is installed in place, so that the arch test piece is located between a pair of surrounding pieces, then the hydraulic cylinder is controlled to elongate, a pair of connecting pieces and surrounding pieces are pushed to approach each other and fold again, so that the arch test piece is covered in the surrounding hole, and the installation or dismounting efficiency of the arch test piece is improved.

[0028] 3. The steel pipe concrete arch rib multi-point synchronous multi-working condition loading test device and method, a roller is arranged in the surrounding piece and adheres to the surface of the arch test piece, when the arch test piece is axially deformed under the action of load, the roller can rotate flexibly, so that the deformation constraint of the arch test piece in the length direction is effectively released, the loading force is continuously and uniformly transmitted to the arch test piece through the surrounding piece, the limitation of the traditional fixed connection mode on the deformation of the test piece is avoided, and the interference of the rigidity of the test device itself on the measurement result is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] The application will be further described below with reference to the drawings.

[0030] Figure 1 is a perspective view of the application;

[0031] Figure 2 is a structural schematic view of the loading assembly in the application;

[0032] Figure 3 is a structural schematic view of the surrounding piece after separation in the application;

[0033] Figure 4 is a structural schematic view of the roller and the limiting roller in the application;

[0034] Figure 5 is a sectional view of the surrounding piece in the application;

[0035] Figure 6is a sectional view of the roller in the application;

[0036] Figure 7 is a structural schematic view of the limiting roller in the application;

[0037] Figure 8 is a sectional view of the limiting roller in the application;

[0038] Figure 9 is a schematic view of the method flow in the application.

[0039] In the figure: counter-pulling beam 1, fixed seat 2, counter-force frame 3, loading assembly 4, arch test piece 5, counter-force beam 41, load sensor 42, bidirectional jack 43, surrounding piece 44, surrounding hole 45, support frame 46, guide rod 47, connecting piece 48, hydraulic cylinder 49, roller 50, sliding groove 51, sliding block 52, connecting rod 53, compression spring 54, support 55, hollow shaft 56, guide pipe 57, slit 58, baffle cover 59, air groove 60, limiting roller 61, limiting frame 62, end plate 63, combination column 64, combination ring 65, elastic connecting ring 66, motor 67, wheel disc 68, spring rod 69, guide ball 70, spring sheet 71. DETAILED DESCRIPTION

[0040] In order to make the technical means, creative features, purposes and effects realized by the application easy to understand, the application is further described below in combination with specific embodiments.

[0041] As shown in Figures 1 to 8 the application relates to a kind of steel pipe concrete arch rib multi-point synchronous multi-working condition loading test device, including counter-pulling beam 1, fixed seat 2, counter-force frame 3 and loading assembly 4;

[0042] The fixed seat 2 is provided with a pair of fixed connection on the both ends of the counter-pulling beam 1;The counter-force frame 3 is provided with a group and is evenly distributed above the counter-pulling beam 1;

[0043] The loading assembly 4 is provided with a group and is arranged between the counter-force frame 3 respectively;The loading assembly 4 is used to load test on arch test piece 5;

[0044] The loading assembly 4 includes counter-force beam 41, and the counter-force beam 41 is fixedly connected with the counter-force frame 3;The counter-force beam 41 side is sequentially provided with load sensor 42 and bidirectional jack 43;The bidirectional jack 43 is provided with surrounding piece 44 below;The surrounding hole 45 is provided in the surrounding piece 44;The surrounding hole 45 is inclined design, and arch test piece 5 passes through the inside of surrounding hole 45;The height of loading assembly 4 at different positions and the inclination degree of surrounding hole 45 are different, to adapt to the local shape of arch test piece 5.

[0045] The core defect of the current test device for the in-plane stability research of the steel pipe concrete arch is the disconnection between the single loading mode and the actual stress working condition. The existing technology generally relies on hydraulic jacks and other equipment to apply vertical pressure to the arch rib to simulate dead load and static load working conditions, but this is significantly different from the dynamic stress state of the arch bridge in actual operation. When vehicles and other live loads pass through the bridge, complex dynamic effects are generated on the arch structure, resulting in cyclic stress changes in specific areas of the arch (such as near the arch foot and quarter point) between tension and compression. However, the existing device does not have the capability to simulate tensile or alternating tensile and compressive loads, resulting in serious deficiencies in the test research, which cannot reveal the material properties, section cracking behavior, and tensile interfacial working mechanism of the steel pipe concrete arch under tensile force, nor can it evaluate the long-term performance, stiffness degradation law, and dynamic stability of the structure under fatigue load, leading to the difficulty of the test conclusion to fully reflect the real bearing capacity and failure mechanism of the structure, restricting the further improvement of the design theory and the precise assessment of engineering safety.

[0046] The present application constructs a multi-point synchronous loading system by distributing multiple independent loading assemblies 4 on the tensile beam 1, each assembly integrating a counter-force beam 41, a load sensor 42, and a bidirectional jack 43, and cooperating with a uniquely designed surrounding member 44. During the experiment, the arch test piece 5 is sequentially inserted into the surrounding holes 45 of each surrounding member 44. The loading assembly 4 at each position can be controlled to extend or shorten by the bidirectional jack 43, and the surrounding member 44 can apply pressure, tension, or alternating load to the arch test piece 5, achieving multi-point synchronous and multi-condition loading test, and fully simulating the actual application scenario of the arch bridge.

[0047] The present application enables researchers to accurately control the pressure, tension, or alternating tensile and compressive dynamic load applied by each loading point to the arch test piece 5 according to the actual stress simulation requirements of the bridge, greatly enriching and expanding the test working condition range, and more realistically simulating the complex stress state of the arch bridge under the action of live loads such as vehicle passing, thereby providing a reliable technical means for in-depth research on the dynamic response, fatigue performance, and whole-process stress mechanism of the steel pipe concrete arch, significantly improving the simulation degree of the test and the engineering guidance value of the data.

[0048] The present application drives multiple loading assemblies 4 of bidirectional jacks 43 by adopting a centralized oil circuit system, and introduces a programmable logic controller (PLC) for overall control. The PLC system can automatically and synchronously manage the force application process of all loading points with high precision according to the preset program, ensuring the accurate consistency of the load size and loading rate of each point, effectively eliminating human operation errors, and realizing complex loading timing and load spectrum, which helps to improve the accuracy of the loading force and the reliability of the test data, and provides a solid foundation for simulating the structural response under real working conditions.

[0049] As one of the embodiments of the present application, the bidirectional jack 43 is fixedly connected with a support frame 46 at the lower side; a group of guide rods 47 are fixedly connected inside the support frame 46; the top of the surrounding part 44 is provided with a connecting piece 48; the guide rods 47 penetrate through the connecting piece 48 and are in sliding connection therewith; the surrounding part 44 and the connecting piece 48 are both designed in a half-split type; the connecting piece 48 and the support frame 46 are both fixedly connected with a hydraulic cylinder 49.

[0050] By designing the surrounding part 44 and the connecting piece 48 in a half-split type, the actual operation is facilitated; by controlling the hydraulic cylinder 49 to contract, a pair of connecting pieces 48 and the surrounding part 44 are driven to separate from each other, then the arch test piece 5 is installed in place, so that the arch test piece 5 is located between a pair of surrounding parts 44, then by controlling the hydraulic cylinder 49 to extend, a pair of connecting pieces 48 and the surrounding part 44 are driven to move close to each other and re-fold, so as to cover the arch test piece 5 inside the surrounding hole 45, thereby improving the installation or dismounting efficiency of the arch test piece 5.

[0051] As one of the embodiments of the present application, a group of rollers 50 are evenly distributed inside the surrounding hole 45; the rollers 50 are distributed on the upper and lower sides of the arch test piece 5 and are in close contact therewith.

[0052] By arranging the rollers 50 in close contact with the surface of the arch test piece 5 inside the surrounding part 44, when the arch test piece 5 is axially deformed under the action of the load, the rollers 50 can rotate flexibly, thereby effectively releasing the deformation constraint of the arch test piece 5 in the length direction, ensuring that the loading force is continuously and uniformly transmitted to the arch test piece 5 through the surrounding part 44, and avoiding the limitation of the traditional fixed connection mode on the deformation of the test piece, thereby reducing the interference of the stiffness of the test device itself on the measurement results.

[0053] A group of sliding grooves 51 are arranged inside the surrounding part 44, and the sliding grooves 51 correspond to the rollers 50 one by one; a sliding block 52 is arranged inside the sliding groove 51; the sliding block 52 is fixedly connected with a connecting rod 53 at one side, and a compression spring 54 is fixedly connected between the other side and the sliding groove 51; one end of the connecting rod 53 extending into the surrounding hole 45 is fixedly connected with a bracket 55, and the roller 50 is in rotary connection with the bracket 55.

[0054] Through the cooperation of the slider 52, the connecting rod 53, the compression spring 54 and the roller 50, a set of intelligent contact systems capable of dynamically responding to the deformation of the test piece is constructed. When the surrounding piece 44 moves upward or downward, the arch test piece 5 can extrude a group of rollers 50 below or above it. The roller 50 and the connecting rod 53 drive the slider 52 to move inside the sliding groove 51 to adaptively compress the compression spring 54. Therefore, no matter how the loading direction changes, the pressure of the compression spring 54 can continuously push the roller 50 to closely contact the surface of the arch test piece 5, eliminating the contact gap caused by the deformation of the arch test piece 5. Not only can it effectively avoid the local stress concentration problem caused by the traditional rigid contact, but also can adaptively respond to the complex curved surface deformation of the arch test piece 5 in the loading process, ensuring the continuity and uniformity of load transmission.

[0055] As one of the embodiments of the application, the slider 52 and the sliding groove 51 are in sliding sealing cooperation; the hollow shaft 56 is fixedly connected inside the bracket 55; the hollow shaft 56 penetrates the roller 50 and is in rotary sealing cooperation with the roller 50; the hollow shaft 56 is communicated with the conduit 57, and the other end of the conduit 57 extends to the surface of the slider 52; the roller 50 is designed as a hollow structure and is communicated with the hollow shaft 56; a group of slits 58 are uniformly distributed on the surface of the roller 50.

[0056] When the arch test piece 5 drives the slider 52 to move inside the sliding groove 51 through the roller 50 and the connecting rod 53, the slider 52 can extrude the air in the sliding groove 51, so that the compressed air enters the inside of the hollow shaft 56 and the roller 50 through the conduit 57, and is sprayed outward along the slits 58 on the surface of the roller 50. Thus, the gap between the roller 50 and the arch test piece 5 is blown by the airflow, and the dust, concrete slag and other particulate impurities in the gap are removed, so that the mechanical interface between the roller 50 and the arch test piece 5 is kept clean. This effectively solves the problem that impurities accumulate during the test process and affect the mechanical transmission, avoids the accumulation of these tiny particles on the contact surface to form a local fulcrum, and ensures that the roller 50 always rotates smoothly, eliminating the additional friction constraint caused by impurities, so that the load transmission is more in line with the theoretical preset boundary conditions.

[0057] The side of the hollow shaft 56 close to the arch test piece 5 is fixedly connected with a baffle 59, and the baffle 59 is located inside the roller 50; the hollow shaft 56 and the baffle 59 are communicated with an air groove 60.

[0058] When the compressed air enters the inside of the roller 50 along the hollow shaft 56 and the air groove 60, the baffle 59 can converge and concentrate the air. No matter what angle the roller 50 rotates to, the baffle 59 can direct the airflow to the direction of the arch test piece 5, so as to increase the utilization degree and blowing force of the airflow and improve the removal efficiency of particulate matter between the roller 50 and the arch test piece 5.

[0059] As one of the embodiments of the present application, a set of limiting rollers 61 are uniformly distributed inside the surrounding hole 45; the limiting rollers 61 are distributed on the horizontal two sides of the arch test piece 5 and are attached thereto.

[0060] By setting the limiting rollers 61 which are horizontally and symmetrically distributed, a lateral constraint mechanism is formed for the arch test piece 5, which prevents the test piece from deforming out of the arch plane; when the test piece deforms in the arch plane, the limiting rollers 61 can rotate to adapt to the deformation, which not only accurately prevents the arch test piece 5 from losing stability out of the plane, but also eliminates the constraint on the in-plane deformation of the arch test piece 5 through the follow-up rotation characteristics, so that the test piece can deform freely in a state closer to the real boundary condition, ensuring that the test data can more accurately reflect the actual mechanical response and instability mechanism of the arch structure.

[0061] A limiting frame 62 is arranged between the limiting roller 61 and the surrounding member 44; the limiting frame 62 is fixedly connected with an end plate 63 and a combination column 64 at both ends; the limiting roller 61 is designed as a hollow structure and has a combination ring 65 arranged inside both ends thereof; the combination ring 65 is fixedly connected with an elastic connecting ring 66 between the limiting roller 61; the combination ring 65 is sleeved outside the combination column 64 and rotationally matched with the combination column 64; the combination column 64 is fixedly connected with a motor 67 on the surface; the output shaft of the motor 67 is connected with a wheel disc 68; a set of spring rods 69 are uniformly distributed on the surface of the wheel disc 68; guide balls 70 are fixedly connected at the end portions of the spring rods 69; a plurality of elastic sheets 71 in a convex shape are uniformly distributed at the corresponding positions of the wheel disc 68 on the inner side of the limiting roller 61.

[0062] During the test process, the motor 67 inside the limiting roller 61 drives the wheel disc 68 and the plurality of spring rods 69 and guide balls 70 to rotate, and then the guide balls 70 continuously hit the surface of the elastic sheets 71, so as to make the elastic sheets 71 produce a shaking effect; the shaking effect is transmitted to the arch test piece 5 through the limiting roller 61, so that the limiting roller 61 can apply a continuous and controllable micro-vibration to the arch test piece 5; such a dynamic vibration loading condition effectively restores the real stress state of the arch bridge under complex environmental excitations such as vehicle passing and wind load, effectively stimulates the cumulative damage characteristics of the structure under complex actions, and provides technical support for the research on the fatigue performance, dynamic stability and long-term service behavior of the arch bridge.

[0063] As shown in Figure 9 The steel pipe concrete arch rib multi-point synchronous multi-working condition loading test method of the present application adopts the steel pipe concrete arch rib multi-point synchronous multi-working condition loading test device, and comprises the following steps:

[0064] S1, the arch test piece 5 is arranged between a plurality of counterforce frames 3, and the two ends of the arch test piece 5 are fixedly connected with the fixed seats 2; the hydraulic cylinders 49 of each loading assembly 4 are controlled to be elongated, the connecting pieces 48 and the surrounding members 44 are pushed to approach each other to fold, so as to place the arch test piece 5 inside the surrounding hole 45.

[0065] S2, the two-way jack 43 in different positions is controlled to work synchronously through the PLC oil circuit system, driving the surrounding piece 44 to move relative to the arch test piece 5, and continuously applying a vertical load to the arch test piece 5;

[0066] S3, when the arch test piece 5 deforms in the arch plane under the action of the load, the roller 50 rotates flexibly, and the compression spring 54 is adaptively compressed, so that the roller 50 fully adheres to and adapts to the deformation degree of the arch test piece 5;

[0067] S4, the arch test piece 5 is laterally constrained by the limiting roller 61, so as to prevent the test piece from deforming out of the arch plane, and when the test piece deforms in the arch plane, the limiting roller 61 rotates to adapt to the deformation degree;

[0068] S5, the motor 67 inside the limiting roller 61 drives the wheel disc 68 and the spring rod 69, and the guide ball 70 rotates, the guide ball 70 constantly hits the surface of the spring sheet 71, and the spring sheet 71 generates a shaking effect;

[0069] S6, the shaking effect of the spring sheet 71 is transmitted to the arch test piece 5 through the limiting roller 61, so that the limiting roller 61 can apply a continuous controllable micro vibration to the arch test piece 5, and restore the real stress state of the arch bridge under complex environmental excitation.

[0070] The above front, back, left, right, up and down are based on the drawings in the specification Figure 1 As a standard, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and the like.

[0071] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application.

[0072] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited to the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A kind of steel pipe concrete arch rib multi-point synchronous multi-working condition loading test device, it is characterized by: Including a pair of pull beams (1), fixed seats (2), counterforce frames (3) and loading assemblies (4); The fixed seat (2) is provided with a pair of and is fixedly connected to the two ends of the pair of pull beams (1); the counterforce frame (3) is provided with a group and is evenly distributed above the pair of pull beams (1); The loading assembly (4) is provided with a group and is arranged between the counterforce frames (3) respectively; the loading assembly (4) is used for loading test on the arch test piece (5); The loading assembly (4) comprises a counterforce beam (41), the counterforce beam (41) is fixedly connected with the counterforce frame (3); the lower side of the counterforce beam (41) is sequentially provided with a load sensor (42) and a bidirectional jack (43); the lower side of the bidirectional jack (43) is provided with a surrounding piece (44); the inside of the surrounding piece (44) is provided with a surrounding hole (45); the surrounding hole (45) is designed to be inclined, and the arch test piece (5) passes through the inside of the surrounding hole (45).

2. The steel tube concrete arch rib multi-point synchronous multi-working condition loading test device according to claim 1, characterized in that: The lower side of the bidirectional jack (43) is fixedly connected with a support frame (46); the inside of the support frame (46) is fixedly connected with a group of guide rods (47); the top of the surrounding piece (44) is provided with a connecting piece (48); the guide rods (47) penetrate through the connecting piece (48) and are slidably connected with the connecting piece (48); the surrounding piece (44) and the connecting piece (48) are both designed to be half-separated; the connecting piece (48) and the support frame (46) are both fixedly connected with a hydraulic cylinder (49).

3. The steel tube concrete arch rib multi-point synchronous multi-working condition loading test device according to claim 2, characterized in that: A group of rollers (50) are evenly distributed in the inside of the surrounding hole (45); the rollers (50) are distributed on the upper and lower sides of the arch test piece (5) and are attached to the arch test piece (5).

4. The steel tube concrete arch rib multi-point synchronous multi-working condition loading test device according to claim 3, characterized in that: A group of sliding grooves (51) are formed in the inside of the surrounding piece (44); the inside of the sliding groove (51) is provided with a sliding block (52); one side of the sliding block (52) is fixedly connected with a connecting rod (53), and the other side is fixedly connected with a compression spring (54) between the sliding groove (51); one end of the connecting rod (53) extending into the inside of the surrounding hole (45) is fixedly connected with a support (55), and the roller (50) is rotatably connected with the support (55).

5. The steel tube concrete arch rib multi-point synchronous multi-working condition loading test device according to claim 4, characterized in that: The sliding block (52) and the sliding groove (51) are in sliding sealing cooperation; the inside of the support (55) is fixedly connected with a hollow shaft (56); the hollow shaft (56) penetrates through the roller (50) and is in rotatable sealing cooperation with the roller (50); the hollow shaft (56) is communicated with a conduit (57), and the other end of the conduit (57) extends to the surface of the sliding block (52); the roller (50) is designed to be a hollow structure and is communicated with the hollow shaft (56); a group of slits (58) are evenly distributed on the surface of the roller (50).

6. The steel tube concrete arch rib multi-point synchronous multi-working condition loading test device according to claim 5, characterized in that: One side of the hollow shaft (56) close to the arch test piece (5) is fixedly connected with a baffle cover (59), and the baffle cover (59) is located in the inside of the roller (50); the hollow shaft (56) and the baffle cover (59) are communicated with an air groove (60).

7. The steel tube concrete arch rib multi-point synchronous multi-working condition loading test device according to claim 6, characterized in that: A group of limiting rollers (61) are evenly distributed in the inside of the surrounding hole (45); the limiting rollers (61) are distributed on the horizontal two sides of the arch test piece (5) and are attached to the arch test piece (5).

8. The steel tube concrete arch rib multi-point synchronous multi-working condition loading test device according to claim 7, characterized in that: The limiting roller (61) and the surrounding part (44) are provided with a limiting frame (62); both ends of the limiting frame (62) are fixedly connected with an end plate (63) and a combination column (64); the limiting roller (61) is designed as a hollow structure, and the inside of both ends thereof is provided with a combination ring (65); the combination ring (65) and the limiting roller (61) are fixedly connected with an elastic connecting ring (66); the combination ring (65) is respectively sleeved outside the combination column (64) and rotationally matched with the combination column (64); the surface of the combination column (64) is fixedly connected with a motor (67); the output shaft of the motor (67) is connected with a wheel disc (68); a group of spring rods (69) and guide balls (70) are uniformly distributed on the surface of the wheel disc (68); a group of elastic sheets (71) are uniformly distributed on the inside of the limiting roller (61).

9. A method for testing a steel tube concrete arch rib by multi-point synchronous multi-working condition loading, wherein the method uses the steel tube concrete arch rib multi-point synchronous multi-working condition loading test device as claimed in claim 8, characterized in that: Comprise the following steps: S1, the arch test piece (5) is arranged between a plurality of counterforce frames (3), the two ends of the arch test piece (5) are fixedly connected with the fixed seat (2), the hydraulic cylinder (49) of each loading assembly (4) is controlled to elongate, the connecting piece (48) and the surrounding part (44) are pushed to each other to close, so that the arch test piece (5) is placed in the surrounding hole (45); S2, the bidirectional jack (43) at different positions is controlled to work synchronously by the PLC oil circuit system, the surrounding part (44) is driven to move relative to the arch test piece (5), and the vertical load is continuously applied to the arch test piece (5); S3, when the arch test piece (5) deforms in the arch plane under the action of the load, the roller (50) rotates flexibly, and the compression spring (54) is adaptively compressed, so that the roller (50) fully adheres to and adapts to the deformation degree of the arch test piece (5).

10. The method according to claim 9, wherein the method is characterized in that: Further comprise the following steps: S4, the limiting roller (61) is arranged to form lateral constraint on the arch test piece (5), so as to prevent the test piece from deforming out of the arch plane, when the test piece deforms in the arch plane, the limiting roller (61) rotates to adapt to the deformation degree; S5, the motor (67) inside the limiting roller (61) drives the wheel disc (68) and the spring rod (69) and the guide ball (70) to rotate, the guide ball (70) constantly hits the surface of the elastic sheet (71), so as to make the elastic sheet (71) produce a shaking effect; The shaking effect of the elastic sheet (71) is transmitted to the arch test piece (5) through the limiting roller (61), so that the limiting roller (61) can apply a continuous controllable micro vibration to the arch test piece (5), and the real stress state of the arch bridge under complex environmental excitation is restored.

Images