Corrugated Steel Reinforced Recycled Concrete Composite Arch and Its Performance Loading Device and Testing Method

Abstract

The present invention belongs to the technical field of arch shell structures and performance loading, specifically a corrugated steel recycled concrete composite arch and its performance loading device and testing method, including a corrugated steel arch, which is formed by mechanically rolling a flat steel plate into a flat corrugated steel plate and then using an arching device to form a corrugated steel arch; vertical connecting steel bars, which are arranged at the wave crests and wave troughs of the cross-section of the corrugated steel arch, uniformly distributed along the span direction, and the vertical connecting steel bars are welded to the corrugated steel arch; longitudinal stressed steel bars, which are arranged along the span direction of the corrugated steel arch and are respectively welded and fixed to the vertical connecting steel bars at the wave crests and wave troughs; transverse connecting steel bars, which are uniformly arranged transversely along the span direction of the corrugated steel arch and are respectively welded to the longitudinal stressed steel bars; fixed steel plates, the arch feet of the corrugated steel arch and the ends of the longitudinal stressed steel bars are welded to the fixed steel plates; concrete, and the thickness of the concrete structure is greater than 150 mm.

Description

Technical Field

[0001] The invention belongs to the technical field of arch shell structure and performance loading, in particular to a corrugated steel recycled concrete composite arch and a performance loading device and a testing method thereof. Background Art

[0002] In recent years, corrugated steel shallow arch structures have been widely used in the fields of highway culverts, tunnel bridges, municipal roads, civil buildings, agriculture, renovation and reinforcement, and protective structures. They have the advantages of simple structure, easy processing, convenient installation, low engineering cost, fast construction speed, and good durability. As the structure gradually develops towards large spans and high loads, the stability problem of corrugated steel arch structures has become increasingly prominent. Structural failure may occur when subjected to large loads. Its disadvantages are low bearing capacity, low rigidity, structural leakage, and concrete cracking.

[0003] To this end, the present invention proposes a corrugated steel recycled concrete composite arch (referred to as corrugated steel composite arch) to replace the corrugated steel shallow arch structure based on the working principle of the composite structure, and sets a performance loading device and a testing method for the new structure, conducts experiments and finite element research on the long-term performance and static performance of the corrugated steel composite arch, establishes a method for calculating its stable bearing capacity, promotes relevant research on its stress performance and working mechanism, and promotes the application and development of the corrugated steel composite arch, a new type of high-efficiency composite component, in engineering structures. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background technology, the present invention provides a corrugated steel recycled concrete composite arch and a performance loading device and a testing method thereof. The present invention is a detachable multifunctional corrugated steel recycled concrete composite arch long-term performance loading device and a testing method.

[0005] The technical solution adopted by the present invention to solve the technical problem is: the corrugated steel recycled concrete composite arch described in the present invention comprises a corrugated steel composite arch, and the corrugated steel composite arch comprises:

[0006] Corrugated steel arches are made by mechanically rolling flat steel plates into flat corrugated steel plates, and then using an arching device to form corrugated steel arches;

[0007] Vertical connecting steel bars are arranged at the crests and troughs of the cross section of the corrugated steel arch, evenly distributed along the span direction, and the vertical connecting steel bars are welded to the corrugated steel arch;

[0008] The longitudinal stress-bearing steel bars are arranged along the span direction of the corrugated steel arch and are welded and fixed to the vertical connecting steel bars at the crest and trough respectively;

[0009] The transverse connecting steel bars are evenly arranged transversely along the span direction of the corrugated steel arch and are respectively welded and connected to the longitudinal stress-bearing steel bars;

[0010] The fixed steel plate, the arch feet of the corrugated steel arch, and the ends of the longitudinal stressed steel bars are welded and connected to the fixed steel plate;

[0011] Concrete, and the thickness of the concrete structure is greater than 150 mm.

[0012] Preferably, triangular stiffening plates are added at the arch feet of the corrugated steel arch for reinforcement, and screws are added between the arch feet and the longitudinal stressed steel bars. The screws are welded and connected to the fixed steel plate to ensure the effective connection between the concrete and the fixed steel plate.

[0013] The performance loading device of a corrugated steel recycled concrete composite arch described in the present invention includes a loading unit, a concrete foundation, resistance strain gauges, and displacement sensors; the loading unit includes:

[0014] A base, and two bases are fixed to the concrete foundation with anchor bolts to bear the loads generated during the entire test process;

[0015] A tie rod, and two bases are connected by symmetric C-shaped channel steel tie rods to balance the horizontal thrust generated by the corrugated steel composite arch during the test;

[0016] A conversion seat, and both ends of the corrugated steel composite arch specimen are bolted to the conversion seat. The lower part of the conversion seat is connected to the base by bolts;

[0017] A reaction frame, the bottom of the reaction frame is fixed to the concrete foundation with anchor bolts, the upper part is provided with a cross beam for fixing the reaction beam, and the middle part is provided with a limit plate with a C-shaped groove. The two sides of the reaction frame are symmetrically arranged to offset the vertical reaction force generated by the loading;

[0018] A reaction beam, both ends of the reaction beam are bolted to the reaction frames on both sides, and the middle is used to fix the hydraulic jack and the guide rod;

[0019] A force transmission plate, which is divided into an upper force transmission plate and a lower force transmission plate. The upper side of the upper force transmission plate abuts against the end face of the cylinder rod of the hydraulic jack, and the lower side is fixed with a pressure sensor. The upper side of the lower force transmission plate abuts against the end face of the pressure sensor, and the lower side is provided with two circular grooves for inlaying compression springs;

[0020] A distribution beam, both ends of the distribution beam are provided with C-shaped convex grooves to cooperate with the C-shaped grooves on the reaction frame for limiting, and the upper part is provided with two circular grooves for inlaying compression springs;

[0021] A guide rod, one end of the guide rod is provided with a thread and is connected to the reaction beam, the other end is a smooth rod and passes through the upper force transmission plate, the lower force transmission plate, and the distribution beam, and there is a section of thread in the middle for locking the upper force transmission plate through a nut.

[0022] Preferably, the hydraulic jack is fixed on the reaction beam, and the end face of the cylinder rod abuts against the upper force transmission plate, serving as the power source for instantaneous loading.

[0023] Preferably, the compression spring is arranged between the upper force transmission plate and the lower force transmission plate and sleeved outside the guide rod. After the hydraulic jack is instantaneously loaded, the compression spring shrinks to generate a spring force, and the upper force transmission plate is locked with a nut. Then the hydraulic jack is unloaded. At this time, the spring force serves as the power source for long-term performance loading.

[0024] Preferably, protective components are arranged on both sides of the corrugated steel composite arch on the surface of the reaction frame; the protective components are used to block the concrete fragments that fly outwards when the corrugated steel composite arch is loaded to failure;

[0025] The protective component includes a translation plate; an elastic curtain and a shear fork telescopic mechanism are arranged between the translation plate and the reaction frame; a movable block is slidably connected to the surface of the reaction frame, and one end of the shear fork telescopic mechanism is hinged to the movable block; an electric telescopic rod is fixedly connected to the surface of the reaction frame; the output end of the electric telescopic rod is connected to the movable block.

[0026] Preferably, a storage groove is arranged on the surface of the reaction frame; a storage roller is rotatably connected inside the storage groove, and the elastic curtain is wound around the surface of the storage roller; a torsion spring is arranged between the storage roller and the reaction frame.

[0027] Preferably, installation grooves are arranged at the top and bottom of the storage groove; elastic blocks are fixedly connected inside the installation grooves; damping blocks are fixedly connected to the surfaces of both ends of the storage roller extending into the installation grooves; balls are rotatably connected to the surfaces of the damping blocks.

[0028] Preferably, mounting blocks are fixedly connected to the surface of the reaction frame at the top and bottom positions of the elastic curtain; a sliding sleeve is fixedly connected to one side of the mounting block close to the elastic curtain; a sliding core is slidably and sealingly connected inside the sliding sleeve; a tension spring is fixedly connected between the sliding core and the sliding sleeve;

[0029] The elastic block is designed as a hollow air storage structure; an elastic resetting member is fixedly connected inside the elastic block; the elastic block and the sliding sleeve are communicated with each other through a conduit.

[0030] A test method for a corrugated steel recycled concrete composite arch according to the present invention includes: S1, specimen preparation; S2, loading preparation; S3, instantaneous loading; S4, long-term loading; S5: test data collection.

[0031] The beneficial effects of the present invention are as follows:

[0032] 1. Due to the presence of concrete, the overall rigidity of the corrugated steel composite arch structure is greatly improved, the stability of the corrugated steel is significantly improved, and its construction span can be extended from small and medium spans to larger spans; the connecting steel bars can be used as frame steel bars on the one hand, so that the corrugated steel and the longitudinal force-bearing steel bars form a coordinated force-bearing whole, and on the other hand, they can be used as stirrups inside the structure to improve the shear resistance of the composite shallow arch; in addition, the structure can use corrugated steel plates as concrete pouring templates to achieve support-free construction, and the corrugated steel composite arch can also be prefabricated in sections and spliced on site to achieve assembly construction; based on the above characteristics, the corrugated steel composite arch can effectively solve the problems of insufficient stability and bearing capacity of the corrugated steel structure, and is particularly suitable for use in tunnels, underground comprehensive pipeline corridors, bridges and culverts with larger spans and higher loads.

[0033] 2. The loading device can test specimens with different loading conditions (single-point loading, multi-point loading), different span-rise ratios, different bolt spacings, and different concrete strengths. The load changes at the loading point and the strain and displacement changes at the peak, middle, trough, and other locations of the arch section can be monitored and recorded in real time using resistance strain gauges, displacement sensors, pressure sensors, and data acquisition instruments. Based on the measurement results, the failure mode, ultimate bearing capacity, and full-process load-displacement curve of the corrugated steel composite arch under single-point loading are obtained. The changes in the failure mode of the corrugated steel composite arch under different span-rise ratios are analyzed. The stress distribution and development law of the corrugated steel composite arch under single-point loading are obtained, revealing the combined effect of corrugated steel and concrete in the composite shallow arch, and exploring whether there is an effective concrete constraint effect in the composite shallow arch under single-point loading.

[0034] 3. The loading device utilizes hydraulic jacks and compression springs to realize instantaneous loading and long-term loading functions. During long-term loading, the hydraulic jack is in an unloading state. The spring force serves as the power source of the load, which can avoid the failure of the unloading test of the hydraulic jack during long-term loading.

[0035] 4. The loading device has a simple structure and is easy to disassemble and install. It can also be used for loading tests of other arch structures.

[0036] 5. This test method can monitor the displacement and strain changes of corrugated steel composite arches under transient and long-term loads in real time, and determine the in-plane and out-of-plane stability of the arches. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] Figure 1 is a three-dimensional diagram of the corrugated steel composite arch in the present invention;

[0039] Figure 2 It is a schematic diagram of the internal structure of the corrugated steel composite arch in the present invention;

[0040] Figure 3 is a cross-sectional view of the corrugated steel composite arch in the present invention;

[0041] Figure 4 is a front view of the loading unit in the present invention;

[0042] Figure 5 is a side view of the loading unit in the present invention;

[0043] Figure 6 is a schematic installation diagram of the resistance strain gauge and displacement sensor in the present invention;

[0044] Figure 7 is a perspective view of the loading unit in the present invention;

[0045] Figure 8 is Figure 7 a partial enlarged view of part A in;

[0046] Figure 9 is a schematic structural diagram of the protection component in the present invention;

[0047] Figure 10 is Figure 9 a partial enlarged view of part B in;

[0048] Figure 11 is Figure 10 a partial enlarged view of part C in;

[0049] Figure 12 is a perspective view of the sliding sleeve in the present invention;

[0050] Figure 13 is a flowchart of the test method in the present invention.

[0051] In the figure: 1. Corrugated steel composite arch; 11. Corrugated steel arch; 12. Vertical connecting steel bars; 13. Longitudinal stress-bearing steel bars; 14. Transverse connecting steel bars; 15. Fixed steel plate; 16. Triangular gusset plate; 17. Screw; 18. Concrete; 2. Loading unit; 21. Base; 22. Tie rod; 23. Conversion seat; 24. Reaction frame; 25. Reaction beam; 26. Guide rod; 27. Upper reaction plate; 28. Lower reaction plate; 29. Distribution beam; 30. Hydraulic jack; 31. Nut; 32. Pressure sensor; 33. Compression spring; 4. Concrete foundation; 5. Resistance strain gauge; 6. Displacement sensor; 70. Translation plate; 71. Elastic curtain; 72. Scissor expansion mechanism; 73. Movable block; 74. Electric telescopic rod; 75. Storage groove; 76. Storage roller; 77. Coil spring; 78. Installation groove; 79. Elastic block; 80. Damping block; 81. Ball; 82. Installation block; 83. Sliding sleeve; 84. Sliding core; 85. Tensile spring; 86. Elastic resetting member; 87. Duct. Detailed implementation manners

[0052] In order to make the technical means, creative features, achieved purposes and effects realized by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0053] As Figures 1 to 3 shown, a corrugated steel recycled concrete composite arch according to the present invention includes a corrugated steel composite arch 1, and the corrugated steel composite arch 1 includes:

[0054] A corrugated steel arch 11, which is processed by mechanically rolling a flat steel plate into a flat corrugated steel plate, and then the arching is completed by using an arching device. The arching radian is ensured to be accurate through dual control of machinery and manual work;

[0055] Vertical connecting steel bars 12 are arranged at the wave crests and wave troughs of the cross-section of the corrugated steel arch 11, and are uniformly distributed along the span direction. The vertical connecting steel bars 12 are welded to the corrugated steel arch 11;

[0056] Longitudinal stressed steel bars 13 are arranged along the span direction of the corrugated steel arch 11 and are respectively welded and fixed to the vertical connecting steel bars 12 at the wave crests and wave troughs;

[0057] Transverse connecting steel bars 14 are uniformly arranged transversely along the span direction of the corrugated steel arch 11 and are respectively welded to the longitudinal stressed steel bars 13;

[0058] Fixed steel plates 15, the arch feet of the corrugated steel arch 11 and the ends of the longitudinal stressed steel bars 13 are welded to the fixed steel plates 15. Triangular gusset plates 16 are added to reinforce the arch feet of the corrugated steel arch 11, and screws 17 are added between the arch feet and the longitudinal stressed steel bars 13. The screws 17 are welded to the fixed steel plates 15, aiming to ensure the effective connection between the concrete 18 and the fixed steel plates 15;

[0059] Concrete 18, and the structural thickness of the concrete 18 is greater than 150 mm.

[0060] As Figures 4 to 12 shown, a performance loading device for a corrugated steel recycled concrete composite arch according to the present invention includes a loading unit 2, a concrete foundation 4, resistance strain gauges 5 and displacement sensors 6; the loading unit 2 includes:

[0061] Bases 21, two bases 21 are fixed to the concrete foundation 4 with anchor bolts to bear the loads generated during the entire test process;

[0062] Tension rods 22, the ear plates protruding from the two bases 21 are connected by symmetric C-shaped channel steel tension rods 22 to balance the horizontal thrust generated by the corrugated steel composite arch 1 during the test;

[0063] Adapter seats 23, both ends of the test section of the corrugated steel composite arch 1 are bolted to the adapter seats 23, and the lower part of the adapter seats 23 is bolted to the bases 21;

[0064] The reaction frame 24 is fixed to the concrete foundation 4 with anchor bolts at the bottom. There is a cross beam at the upper part for fixing the reaction beam 25, and a limit plate with a C-shaped groove in the middle. On both sides of the reaction frame 24, there are symmetrically arranged components for offsetting the vertical reaction force generated by the loading.

[0065] The reaction beam 25 is fixed to the reaction frames 24 on both sides with bolts at both ends, and is used for fixing the hydraulic jack 30 and the guide rod 26 in the middle.

[0066] The force transfer plates are divided into an upper force transfer plate 27 and a lower force transfer plate 28. Both the upper force transfer plate 27 and the lower force transfer plate 28 are provided with through holes for the guide rod 26 to pass through. The upper side of the upper force transfer plate 27 abuts against the end face of the cylinder rod of the hydraulic jack 30, and a pressure sensor 32 is fixed on the lower side. The upper side of the lower force transfer plate 28 abuts against the end face of the pressure sensor 32, and there are two circular grooves on the lower side for inlaying the compression spring 33.

[0067] The distribution beam 29 is provided with C-shaped protrusions at both ends to cooperate with the C-shaped grooves on the reaction frame 24 for limiting. There are two circular grooves on the upper part for inlaying the compression spring 33, and concentric circular holes are provided at the bottom of the circular grooves for the guide rod 26 to pass through.

[0068] One end of the guide rod 26 is provided with a thread and is connected to the reaction beam 25, and the other end is a smooth rod and passes through the upper force transfer plate 27, the lower force transfer plate 28 and the distribution beam 29. There is a section of thread in the middle for locking the upper force transfer plate 27 with a nut 31 to prevent it from rebounding.

[0069] The cylinder rod of the hydraulic jack 30 pushes the upper force transfer plate 27 to drive the pressure sensor 32 to move downward along the guide rod 26. The end of the pressure sensor 32 drives the lower force transfer plate 28 to move downward along the guide rod 26. The lower force transfer plate 28 compresses the compression spring 33, and the compression spring 33 pushes the distribution beam 29 to move downward and evenly transfers the load of the hydraulic jack 30 to the corrugated steel composite arch 1. After the value read by the pressure sensor 32 reaches the designed set value, the upper force transfer plate 27 is locked with the nut 31, and the hydraulic jack 30 is unloaded. The length of the compression spring 33 no longer changes. At this time, the load received by the corrugated steel composite arch 1 is the constant load of the compression spring 33.

[0070] As a preferred embodiment of the present invention, protective components are provided on the surface of the reaction frame 24 at positions on both sides of the corrugated steel composite arch 1; the protective components are used to block the concrete fragments that fly outwards when the corrugated steel composite arch 1 is loaded to failure.

[0071] The protection component includes a translation plate 70; an elastic curtain 71 and a scissor expansion mechanism 72 are arranged between the translation plate 70 and the reaction frame 24; a movable block 73 is slidably connected to the surface of the reaction frame 24, and one end of the scissor expansion mechanism 72 is hinged to the movable block 73; an electric telescopic rod 74 is fixedly connected to the surface of the reaction frame 24; the output end of the electric telescopic rod 74 is connected to the movable block 73.

[0072] Under normal circumstances, both the elastic curtain 71 and the scissor expansion mechanism 72 are in a contracted state, so as to facilitate the installation of the corrugated steel composite arch 1 into the loading unit 2 and to facilitate the staff to observe the deformation of the corrugated steel composite arch 1 during the loading process. When the values detected by the resistance strain gauges 5 or the displacement sensors 6 approach the design limit value, the control system controls the electric telescopic rod 74 to automatically extend, driving the movable block 73 to move on the surface of the reaction frame 24, and then controlling the scissor expansion mechanism 72 to extend outward. The translation plate 70 is used to drive the elastic curtain 71 to unfold. Through the combined action of multiple protection components, two protection curtain bodies can be formed on both sides of the corrugated steel composite arch 1, and the composite arch is clamped between the protection curtain bodies. Therefore, when the composite arch is damaged during the loading process, the elastic curtain 71 can block the flying gravel blocks generated when the concrete structure collapses, isolate the fragments inside the two protection curtain bodies, prevent the flying fragments from causing harm to the surrounding personnel and equipment, avoid unnecessary losses, and when the gravel blocks impact the surface of the elastic curtain 71, the elastic buffer effect of the elastic curtain 71 itself can further reduce the kinetic energy and its destructive ability of the stones.

[0073] A storage groove 75 is arranged on the surface of the reaction frame 24; a storage roller 76 is rotatably connected inside the storage groove 75, and the elastic curtain 71 is wound around the surface of the storage roller 76; a coil spring 77 is arranged between the storage roller 76 and the reaction frame 24. By arranging the storage roller 76 to wind up the elastic curtain 71, its neatness and occupied space can be improved. When the translation plate 70 moves outward, it can drive the elastic curtain 71 to rotate and release from the surface of the storage roller 76, and cause the coil spring 77 to be in an energy storage state. Subsequently, when the scissor expansion mechanism 72 shortens, the coil spring 77 controls the storage roller 76 to wind up the elastic curtain 71 again.

[0074] As a preferred embodiment of the present invention, mounting grooves 78 are provided at both the top and bottom of the storage groove 75; an elastic block 79 is fixedly connected inside the mounting groove 78; damping blocks 80 are fixedly connected to both ends of the storage roller 76 extending into the mounting groove 78; ball bearings 81 are rotatably connected to the surface of the damping blocks 80. After the concrete fragments impact the surface of the elastic curtain 71, it is easy for residues such as dust and debris to adhere to its surface. By providing the elastic block 79 and the damping blocks 80, during the process of the storage roller 76 rotating and winding the elastic curtain 71, the damping blocks 80 rotate together with the storage roller 76 and intermittently squeeze the elastic block 79. When the damping blocks 80 and the elastic block 79 squeeze each other, a frictional resistance effect is generated, resulting in a decrease in the rotation speed of the storage roller 76. When the damping blocks 80 pass over the elastic block 79, the rotation speed of the storage roller 76 briefly increases. Therefore, a jerky speed change effect will be generated during the rotation of the storage roller 76. Since the elastic curtain 71 itself has elasticity, it can cause the elastic curtain 71 to shake jerkily while being wound up, separating the dust, debris and other residues on its surface. On the one hand, it keeps the elastic curtain 71 clean, and on the other hand, it avoids the problem that the elastic curtain 71 is punctured by sharp debris during the winding process, and prolongs the service life of the elastic curtain 71.

[0075] Mounting blocks 82 are fixedly connected to both the top and bottom positions of the elastic curtain 71 on the surface of the reaction frame 24; a sliding sleeve 83 is fixedly connected to the side of the mounting block 82 close to the elastic curtain 71; a sliding core 84 is slidably and sealingly connected inside the sliding sleeve 83; a tension spring 85 is fixedly connected between the sliding core 84 and the sliding sleeve 83;

[0076] The elastic block 79 is designed as a hollow air storage structure; an elastic reset member 86 is fixedly connected inside the elastic block 79; the elastic block 79 and the sliding sleeve 83 are communicated with each other through a conduit 87.

[0077] When the damping block 80 squeezes the elastic block 79, it causes the elastic block 79 to be compressed and deformed, and the air inside it is squeezed into the sliding sleeve 83 through the conduit 87, pushing the sliding core 84 to extend outwards and impact the elastic curtain 71, increasing the shaking amplitude of the elastic curtain 71, and further shaking off the dust, debris and other residues on its surface. When the damping block 80 passes over the elastic block 79, the elastic reset member 86 drives the elastic block 79 to recover, and the tension spring 85 drives the sliding core 84 to reset inside the sliding sleeve 83.

[0078] As Figure 13 shown, a test method for a corrugated steel recycled concrete composite arch according to the present invention includes:

[0079] S1. Specimen preparation;

[0080] S11. Mechanically roll the flat steel plate to process it into a flat corrugated steel plate, and then use the arching device to complete arching;

[0081] S12. Take samples from the peak, middle, and valley of the corrugated steel arch 11 by laser cutting respectively, and take samples from the flat steel plate as a control.

[0082] S13. Vertically connecting steel bars 12, longitudinally stressed steel bars 13, and horizontally connecting steel bars 14 are implanted on the corrugated steel arch 11.

[0083] S14. Fixing steel plates 15, strengthening triangular rib plates 16, and screws 17 are added at the ends of the corrugated steel arch 11.

[0084] S15. To ensure that the distribution beam 29 can be placed on the corrugated steel composite arch 1 normally, a concrete loading platform is set on the arch surface of the corrugated steel composite arch 1. The loading platform only arranges the steel bar framework, which does not affect the loading test results. The number of loading platforms is consistent with the number of loading points.

[0085] S16. Install the concrete pouring formwork. To ensure the consistency of the concrete thickness, temporary fixing supports are arranged on the outside of the corrugated steel arch 11 to calibrate the thickness of the poured concrete 18.

[0086] S17. Pour the corresponding grade of concrete 18 according to the test requirements, and make standard test blocks of concrete 18 according to the requirements.

[0087] S18. Remove the formwork and cure the corrugated steel composite arch 1.

[0088] S19. Brush white slurry and draw positioning lines on the arch surface and side surface of the corrugated steel composite arch 1.

[0089] S2. Loading preparation;

[0090] S21. Under the vertical uniform load of the corrugated steel composite arch 1, the main internal force of the arch structure is the axial force. In the test, single-point loading or multi-point loading method is adopted. In this test, three-point loading method is adopted.

[0091] S22. Install the cured corrugated steel composite arch 1 on the conversion seat 23 of the loading unit 2 and fix it with bolts.

[0092] S23. At the cross-sections of 0, L / 8 (L is the span of the composite shallow arch), L / 4, 3L / 8, L / 2, 5L / 8, 3L / 4, 7L / 8, and L of the corrugated steel composite arch 1, 2 displacement sensor gauges 6 with adjustable magnetic seats are symmetrically arranged. The displacement sensors 6 at 0 and L are arranged outside the conversion seat 23 to measure the horizontal displacement of the base 21 to check the overall stiffness of the loading device. The displacement sensors 6 at other positions are arranged at the peak of the corrugated steel arch 11 to measure the vertical displacement of the corrugated steel composite arch 1. The average value measured by 2 displacement sensors 6 at each cross-section is taken as the final result.

[0093] S24. To obtain the strain data at various positions of the entire corrugated steel composite arch 1, resistance strain gauges 5 are symmetrically arranged at the cross-sections of all eight-point divisions of the arch. Among them: the corrugated steel resistance strain gauges 5 at each eight-point division include two directions, longitudinal and transverse, and are symmetrically arranged at the wave crests, wave middles, and wave troughs on both sides of the corrugated steel. At each quarter-point of the concrete arch surface, 2 longitudinal resistance strain gauges 5 are symmetrically arranged. To determine the cross-sectional strain distribution of the concrete, 3 resistance strain gauges 5 are arranged at the center and the symmetric two sides of the concrete side surface at each quarter-point;

[0094] S25. Debug the strain, displacement, and load data signal collector to ensure stable data transmission;

[0095] S26. Adjust each distribution beam 29 on the loading unit 2 to be in close contact with the surface of the loading platform of the corrugated steel composite arch 1;

[0096] S3. Instantaneous loading;

[0097] S31. Preloading is carried out using a hydraulic jack 30, and the preloading force is 0.3 times the estimated ultimate load (Pu). The purpose is to eliminate the virtual displacement of the test device;

[0098] S32. Different loading systems are adopted for the formal loading according to different load levels: when the load is less than 0.3Pu, staged loading is adopted, with 50kN as one stage. After that, it is loaded in stages of 30kN until 0.7Pu. After the load exceeds 0.7Pu, continuous loading is carried out until the specimen fails (until the displacement of the specimen continues to increase and the load of the jack drops to 0.8Pu or the corrugated steel composite arch specimen has a failure that is not suitable for continued loading);

[0099] S4. Long-term loading;

[0100] S41. Preloading is carried out using a hydraulic jack 30, and the preloading force is 0.3 times the estimated ultimate load (Pu). The purpose is to eliminate the virtual displacement of the test device;

[0101] S42. Set a constant load. The hydraulic jack 30 continues to load until the data of the pressure sensor 32 read from the control system reaches the pre-estimated value of the long-term loading load. Then, use the nut 31 on the guide rod 26 of the loading unit 2 to lock the upper force plate 27, and the hydraulic jack 30 unloads. At this time, the spring force of the compression spring 33 is the constant load, which can be used as the pressure power source for the long-term performance test of the corrugated steel composite arch 1;

[0102] S5: Test data acquisition;

[0103] The strain data was collected using a DH3816 portable dynamic signal collector, and the displacement and load data were collected using a TST3827 dynamic and static signal collector. Later, the data was aligned by programming a Python script, with the DH3816 collection frequency as the reference.

[0104] The above front, back, left, right, up, and down are all based on the Figure 1 in the accompanying drawings of the specification. Taking the perspective of the person observing as the standard, the side of the device facing the observer is defined as the front, and the left side of the observer is defined as the left, and so on.

[0105] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0106] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. Performance loading device for corrugated steel recycled concrete composite arch, which is used for loading and testing corrugated steel composite arch. The corrugated steel composite arch (1) includes: Corrugated steel arch (11), which is formed by mechanically rolling flat steel plates into flat corrugated steel plates and then using an arching device to form the corrugated steel arch (11); Vertical connecting steel bars (12), which are arranged at the crests and troughs of the cross-section of the corrugated steel arch (11), evenly distributed along the span direction, and the vertical connecting steel bars (12) are welded to the corrugated steel arch (11); Longitudinal stressed steel bars (13), which are arranged along the span direction of the corrugated steel arch (11) and are welded and fixed to the vertical connecting steel bars (12) at the crests and troughs respectively; Transverse connecting steel bars (14), which are evenly arranged transversely along the span direction of the corrugated steel arch (11) and are welded to the longitudinal stressed steel bars (13) respectively; Fixed steel plates (15), to which the arch feet of the corrugated steel arch (11) and the ends of the longitudinal stressed steel bars (13) are welded; Concrete (18), the structural thickness of the concrete (18) is greater than 150 mm; It is characterized in that: the performance loading device includes a loading unit (2), a concrete foundation (4), resistance strain gauges (5) and displacement sensors (6); the loading unit (2) includes: Base (21), two bases (21) are fixed to the concrete foundation (4) with anchor bolts to bear the loads generated during the whole test process; Tie rods (22), two bases (21) are connected by symmetric C-shaped channel steel tie rods (22) to balance the horizontal thrust generated by the corrugated steel composite arch (1) during the test; Adapter block (23), the two ends of the corrugated steel composite arch (1) specimen are bolted to the adapter block (23), and the lower part of the adapter block (23) is connected to the base (21) by bolts; Reaction frame (24), the bottom of the reaction frame (24) is fixed to the concrete foundation (4) with anchor bolts, the upper part is provided with a cross beam for fixing the reaction beam (25), and the middle part is provided with a limit plate with a C-shaped groove. The two sides of the reaction frame (24) are symmetrically arranged to offset the vertical reaction forces generated by the loading; Reaction beam (25), the two ends of the reaction beam (25) are bolted to the reaction frames (24) on both sides, and the middle is used to fix the hydraulic jack (30) and the guide rod (26); Force transfer plates, which are divided into an upper force transfer plate (27) and a lower force transfer plate (28). The upper side of the upper force transfer plate (27) abuts against the end face of the cylinder rod of the hydraulic jack (30), the lower side is fixed with a pressure sensor (32), the upper side of the lower force transfer plate (28) abuts against the end face of the pressure sensor (32), and the lower side is provided with two circular grooves for inlaying compression springs (33); Distribution beam (29), the two ends of the distribution beam (29) are provided with C-shaped protrusions that cooperate with the C-shaped grooves on the reaction frame (24) for limiting, and the upper part is provided with two circular grooves for inlaying compression springs (33); Guide rod (26), one end of the guide rod (26) is provided with a thread and is connected to the reaction beam (25), the other end is a smooth rod and passes through the upper force transfer plate (27), the lower force transfer plate (28) and the distribution beam (29), and there is a section of thread in the middle for locking the upper force transfer plate (27) through a nut (31); The hydraulic jack (30) is fixed on the reaction beam (25), and the end face of the cylinder rod abuts against the upper force transmission plate (27), serving as the power source for instantaneous loading. The compression spring (33) is arranged between the upper force transmission plate (27) and the lower force transmission plate (28) and sleeved outside the guide rod (26). After the hydraulic jack (30) is instantaneously loaded, the compression spring (33) contracts to generate a spring force, and the upper force transmission plate (27) is locked with a nut (31). Then the hydraulic jack (30) is unloaded, and at this time, the spring force serves as the power source for long-term performance loading. On the surface of the reaction frame (24), protective components are arranged at both positions on both sides of the corrugated steel composite arch (1); the protective components are used to block the concrete fragments that fly outwards when the corrugated steel composite arch (1) is loaded to failure. The protective component includes a translation plate (70); an elastic curtain (71) and a scissor expansion mechanism (72) are arranged between the translation plate (70) and the reaction frame (24); a movable block (73) is slidably connected to the surface of the reaction frame (24), and one end of the scissor expansion mechanism (72) is hinged to the movable block (73); an electric telescopic rod (74) is fixedly connected to the surface of the reaction frame (24); the output end of the electric telescopic rod (74) is connected to the movable block (73). A storage groove (75) is arranged on the surface of the reaction frame (24); a storage roller (76) is rotatably connected inside the storage groove (75), and the elastic curtain (71) is wound on the surface of the storage roller (76); a torsion spring (77) is arranged between the storage roller (76) and the reaction frame (24).

2. The performance loading device for the corrugated steel recycled concrete composite arch according to claim 1, characterized in that: Installation grooves (78) are arranged at the top and bottom of the storage groove (75); elastic blocks (79) are fixedly connected inside the installation grooves (78); damping blocks (80) are fixedly connected to the surfaces of both ends of the storage roller (76) extending into the installation grooves (78); balls (81) are rotatably connected to the surfaces of the damping blocks (80).

3. The performance loading device of the corrugated steel recycled concrete composite arch according to claim 2, characterized in that: Installation blocks (82) are fixedly connected to the surface of the reaction frame (24) at the top and bottom positions of the elastic curtain (71); a sliding sleeve (83) is fixedly connected to one side of the installation block (82) close to the elastic curtain (71); a sliding core (84) is slidably and hermetically connected inside the sliding sleeve (83); a tension spring (85) is fixedly connected between the sliding core (84) and the sliding sleeve (83). The elastic block (79) is designed as a hollow air storage structure; an elastic resetting member (86) is fixedly connected inside the elastic block (79); the elastic block (79) and the sliding sleeve (83) are communicated with each other through a conduit (87).

4. The performance loading device for the corrugated steel recycled concrete composite arch according to claim 1, characterized in that: For the corrugated steel recycled concrete composite arch, triangular rib plates (16) are added at the arch feet of the corrugated steel arch (11) for reinforcement, and screws (17) are added between the arch feet and the longitudinal stressed steel bars (13). The screws (17) are welded to the fixed steel plates (15) to ensure the effective connection between the concrete (18) and the fixed steel plates (15).

5. Testing method for corrugated steel-recycled concrete composite arch, which uses the performance loading device for corrugated steel-recycled concrete composite arch described in claim 1, characterized in that: Including: S1. Specimen preparation; S11. Mechanically roll the flat steel plate to process it into a flat corrugated steel plate, and then use the arching device to complete arching. S12. Take samples from the peak, middle, and valley of the corrugated steel arch (11) by laser cutting respectively, and take samples from the flat steel plate as a control; S13. Plant vertical connecting steel bars (12), longitudinal stress-bearing steel bars (13), and transverse connecting steel bars (14) on the corrugated steel arch (11); S14. Add fixed steel plates (15), reinforced triangular gusset plates (16), and screws (17) at the ends of the corrugated steel arch (11); S15. Set up a concrete loading platform on the arch surface of the corrugated steel composite arch (1). The loading platform only arranges the steel bar framework, which does not affect the loading test results. The number of loading platforms is consistent with the number of loading points; S16. Install the concrete pouring formwork, and arrange temporary fixed supports on the outside of the corrugated steel arch (11) to calibrate the thickness of the poured concrete (18); S17. Pour the concrete (18) of the corresponding grade according to the test requirements, and make standard test blocks of the concrete (18) according to the requirements; S18. Remove the formwork and cure the corrugated steel composite arch (1); S19. Paint white slurry and draw positioning lines on the arch surface and side surface of the corrugated steel composite arch (1); S2. Loading preparation; S21. Under the vertical uniformly distributed load of the corrugated steel composite arch (1), the main internal force of the arch structure is the axial force. In the test, a single-point loading or multi-point loading method is adopted; S22. Install the cured corrugated steel composite arch (1) on the conversion seat (23) of the loading unit (2) and fix it with bolts; S23. Symmetrically arrange 2 displacement sensors (6) at the cross-sections of 0, L / 8, L / 4, 3L / 8, L / 2, 5L / 8, 3L / 4, 7L / 8, and L of the corrugated steel composite arch (1). The displacement sensors (6) at 0 and L are arranged outside the conversion seat (23), and the displacement sensors (6) at other positions are arranged at the peaks of the corrugated steel arch (11). Take the average value of the 2 displacement sensors (6) at each cross-section as the final result; S24. Symmetrically arrange resistance strain gauges (5) at all octant cross-sections of the corrugated steel composite arch (1). Among them: the corrugated steel resistance strain gauges (5) at each octant point include two directions, longitudinal and transverse, and are symmetrically arranged at the peaks, middles, and valleys on both sides of the corrugated steel. Symmetrically arrange 2 longitudinal resistance strain gauges (5) at the quarter points of the concrete arch surface, and arrange 3 resistance strain gauges (5) at the center and symmetric sides of the concrete side surface at each quarter point; S25. Debug the strain, displacement, and load data signal collectors to ensure stable data transmission; S26. Adjust each distribution beam (29) on the loading unit (2) to be closely attached to the loading platform surface of the corrugated steel composite arch (1); S3. Instantaneous loading; S31. Pre-load, use a hydraulic jack (30) for loading, and the pre-load force is 0.3 times the estimated ultimate load (Pu) to eliminate the virtual displacement of the test device; S32. The formal loading adopts different loading systems according to different load levels: when the load is less than 0.3Pu, adopt graded loading, with 50 kN as one level, and then with 30 kN as one level to load to 0.7Pu. After the load exceeds 0.7Pu, continuously load until the specimen fails; S4. Long-term loading; S41. Preloading: A hydraulic jack (30) is used for loading. The preloading force is 0.3 times the estimated ultimate load (Pu) to eliminate the virtual displacement of the test device. S42. Set a constant load: The hydraulic jack (30) continues to load until the data of the pressure sensor (32) read from the control system reaches the pre-estimated value of the long-term loading load. Then, the nut (31) on the guide rod (26) of the loading unit (2) is used to lock the upward force plate (27), and the hydraulic jack (30) is unloaded. At this time, the spring force of the compression spring (33) is the constant load, which serves as the pressure power source for the long-term performance test of the corrugated steel composite arch (1). S5: Test data acquisition; The strain data is collected using a dynamic signal acquisition instrument, and the displacement and load data are collected using a dynamic and static signal acquisition instrument. The data is aligned later.

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