Corrugated steel and recycled concrete combined arch and performance loading device and testing method thereof

Abstract

The invention belongs to the technical field of arch shell structures and performance loading, and particularly relates to a corrugated steel and recycled concrete combined arch and a performance loading device and a testing method thereof, the corrugated steel and recycled concrete combined arch comprises a corrugated steel arch, a flat steel plate is mechanically rolled and processed into a flat corrugated steel plate, and then the corrugated steel arch is formed by using an arching device; the vertical connecting steel bars are arranged at the wave crests and the wave troughs of the cross section of the corrugated steel arch and are evenly distributed in the span direction, and the vertical connecting steel bars are connected with the corrugated steel arch in a welded mode; the longitudinal load-bearing steel bars are arranged along the span direction of the corrugated steel arch and are respectively welded and fixed with the vertical connecting steel bars at the wave crests and the wave troughs; the transverse connecting steel bars are uniformly and transversely arranged along the span direction of the corrugated steel arch and are respectively welded with the longitudinal load-bearing steel bars; arch feet of the corrugated steel arch and the ends of the longitudinal load-bearing steel bars are connected with the fixed steel plate in a welded mode; the thickness of the concrete structure is larger 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 foot of the corrugated steel arch, the end of the longitudinal stress-bearing steel bar and the fixed steel plate are welded and connected;

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

[0012] Preferably, a triangular rib is added to the arch foot of the corrugated steel arch for reinforcement, screws are added between the arch foot and the longitudinal stress-bearing steel bars, and the screws are welded to the fixed steel plate to ensure an 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 comprises a loading unit, a concrete foundation, a resistance strain gauge and a displacement sensor; the loading unit comprises:

[0014] Base, two bases are fixed to the concrete foundation with anchor bolts to bear the load generated during the entire test process;

[0015] Tie rods, where the two bases are connected by symmetrical C-shaped channel steel tie rods to balance the horizontal thrust generated by the corrugated steel composite arch in the test;

[0016] Conversion seat: both ends of the corrugated steel composite arch specimen are connected with the conversion seat by bolts, and the lower part of the conversion seat is connected with the base by bolts;

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

[0018] Reaction beam: both ends of the reaction beam are fixed to the reaction frames on both sides with bolts, and the middle part is used to fix the hydraulic jack and the guide rod;

[0019] The force transmission plate 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 hydraulic jack cylinder rod, and the pressure sensor is fixed on the lower side. The upper side of the lower force transmission plate abuts against the end face of the pressure sensor, and two circular grooves are provided on the lower side for embedding the compression spring;

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

[0021] A guide rod, one end of which is provided with a thread and connected to the reaction beam, and the other end is a bare rod and passes through the upper force transmission plate, the lower force transmission plate and the distribution beam, and a section of thread is provided 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 surface of the cylinder rod abuts against the upper force transfer plate, serving as a 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 is sleeved on the outside of the guide rod. After the hydraulic jack is instantaneously loaded, the compression spring contracts to generate spring force. The upper force transmission plate is locked with a nut and the hydraulic jack is unloaded. At this time, the spring force serves as the power source for long-term performance loading.

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

[0025] The protection component includes a translation plate; an elastic curtain and a scissor-type 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 scissor-type 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 provided 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 coil spring is provided between the storage roller and the reaction frame.

[0027] Preferably, mounting grooves are provided at the top and bottom of the storage groove; an elastic block is fixedly connected inside the mounting groove; damping blocks are fixedly connected to the surfaces of both ends of the storage roller extending into the mounting groove; and a ball is rotatably connected to the surface of the damping block.

[0028] Preferably, the reaction frame surface is fixedly connected with mounting blocks at the top and bottom of the elastic curtain; the mounting block is fixedly connected with a sliding sleeve on one side close to the elastic curtain; the sliding sleeve is internally connected with a sliding core in a sliding seal; 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 reset piece is fixedly connected inside the elastic block; and the elastic block and the sliding sleeve are communicated with each other through a conduit.

[0030] The testing method of a corrugated steel recycled concrete composite arch described in the present invention comprises: 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 of the present invention;

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

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

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

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

[0045] Figure 8 yes Figure 7 A partial enlarged view of the middle part;

[0046] Fig. 9 It is a schematic diagram of the structure of the protection component in the present invention;

[0047] Fig.10 yes Fig. 9 A partial enlarged view of point B in the middle;

[0048] Fig.11 yes Fig.10 A partial enlarged view of point C in the middle;

[0049] Fig.12 is a three-dimensional diagram of the sliding sleeve in the present invention;

[0050] Fig.13 It is a flow chart of the testing 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 force-bearing steel bars; 14. Horizontal connecting steel bars; 15. Fixed steel plate; 16. Triangular rib plate; 17. Screws; 18. Concrete; 2. Loading unit; 21. Base; 22. Pull 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. Scissors-type telescopic mechanism; 73. Movable block; 74. Electric telescopic rod; 75. Storage slot; 76. Storage roller; 77. Coil spring; 78. Mounting slot; 79. Elastic block; 80. Damping block; 81. Ball bearing; 82. Mounting block; 83. Sliding sleeve; 84. Sliding core; 85. Tension spring; 86. Elastic reset member; 87. Catheter. DETAILED DESCRIPTION

[0052] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0053] like Figures 1 to 3 As shown, the corrugated steel recycled concrete composite arch of the present invention comprises a corrugated steel composite arch 1, wherein the corrugated steel composite arch 1 comprises:

[0054] Corrugated steel arch 11, the flat steel plate is mechanically rolled to be processed into a flat corrugated steel plate, and then the arching device is used to complete the arching, and the curvature of the arching is controlled by both mechanical and manual control to ensure accuracy;

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

[0056] The longitudinal stress-bearing steel bars 13 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 crest and trough respectively;

[0057] The 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 stress-bearing steel bars 13;

[0058] The fixed steel plate 15, the arch foot of the corrugated steel arch 11, the end of the longitudinal stress-bearing steel bar 13 and the fixed steel plate 15 are welded and connected, a triangular rib plate 16 is added to the arch foot of the corrugated steel arch 11 for reinforcement, and screws 17 are added between the arch foot and the longitudinal stress-bearing steel bar 13, and the screws 17 are welded and connected to the fixed steel plate 15, in order to ensure the effective connection between the concrete 18 and the fixed steel plate 15;

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

[0060] like Figures 4 to 12 As shown, the performance loading device of a corrugated steel recycled concrete composite arch described in the present invention includes a loading unit 2, a concrete foundation 4, a resistance strain gauge 5 and a displacement sensor 6; the loading unit 2 includes:

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

[0062] Tie rod 22, two bases 21 extending out of the ear plates are connected by symmetrical C-shaped channel tie rods 22, balancing the horizontal thrust generated by the corrugated steel composite arch 1 in the test;

[0063] The conversion seat 23, both ends of the test section of the corrugated steel composite arch 1 are bolted to the conversion seat 23, and the lower part of the conversion seat 23 is connected to the base 21 by bolts;

[0064] A reaction frame 24, the bottom of which is fixed to the concrete foundation 4 by anchor bolts, the upper part is provided with a crossbeam for fixing the reaction beam 25, the middle part is provided with a limit plate with a C-shaped groove, and the two sides of the reaction frame 24 are symmetrically arranged to offset the vertical reaction force generated by the loading;

[0065] A reaction beam 25, both ends of which are fixed to the reaction frames 24 on both sides by bolts, and the middle is used to fix the hydraulic jack 30 and the guide rod 26;

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

[0067] The distribution beam 29 has C-shaped convex grooves at both ends of the distribution beam 29 that cooperate with the C-shaped grooves on the reaction frame 24 for limiting the position. The upper part has two circular grooves for embedding the compression spring 33, and the bottom of the circular groove has concentric holes for the guide rod 26 to pass through.

[0068] The guide rod 26 has one end with a thread and is connected to the reaction beam 25, and the other end is a bare rod and passes through the upper force transmission plate 27, the lower force transmission plate 28 and the distribution beam 29. A thread is provided in the middle for locking the upper force transmission plate 27 through 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. 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 reading the value of the pressure sensor 32 and reaching the designed set value, the nut 31 is used to lock the force transfer plate 27, the hydraulic jack 30 is unloaded, and the length of the compression spring 33 no longer changes. At this time, the load on the corrugated steel composite arch 1 is a constant load of the compression spring 33.

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

[0071] The protection assembly includes a translation plate 70; an elastic curtain 71 and a scissor-type telescopic 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-type telescopic 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, the elastic curtain 71 and the scissor-type telescopic mechanism 72 are both in a retracted 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 value detected by the resistance strain gauge 5 or the displacement sensor 6 is close to 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-type telescopic mechanism 72 to extend outward, and using the translation plate 70 to drive the elastic curtain 71 to unfold, through multiple protective The components work together to form two protective curtains on both sides of the corrugated steel composite arch 1, and the composite arch is clamped between the protective curtains. Therefore, if the composite arch is damaged during loading, the elastic curtain 71 can block the flying debris generated when the concrete structure collapses, and isolate the debris inside the two protective curtains to prevent the flying debris from causing harm to surrounding personnel and equipment, thereby avoiding unnecessary losses. In addition, when the debris hits the surface of the elastic curtain 71, the elastic buffering effect of the elastic curtain 71 itself can further reduce the kinetic energy of the stone and its destructive ability.

[0073] The reaction frame 24 is provided with a receiving groove 75 on its surface; a receiving roller 76 is rotatably connected inside the receiving groove 75, and the elastic curtain 71 is wound on the surface of the receiving roller 76; a coil spring 77 is provided between the receiving roller 76 and the reaction frame 24. The elastic curtain 71 is rolled up by providing the receiving roller 76 to improve its neatness and space occupation. When the translation plate 70 moves outward, it can drive the elastic curtain 71 to rotate and release from the surface of the receiving roller 76, and cause the coil spring 77 to be in an energy storage state. Later, when the scissor-type telescopic mechanism 72 is shortened, the coil spring 77 controls the receiving roller 76 to rotate and roll up the elastic curtain 71 again.

[0074] As a preferred embodiment of the present invention, the top and bottom of the receiving groove 75 are provided with mounting grooves 78; an elastic block 79 is fixedly connected inside the mounting groove 78; the two end surfaces of the receiving roller 76 extending into the mounting groove 78 are fixedly connected with damping blocks 80; and a ball 81 is rotatably connected to the surface of the damping block 80. After the concrete fragments hit the surface of the elastic curtain 71, dust, debris and other residues are easily adhered to its surface. By providing the elastic block 79 and the damping block 80, when the take-up roller 76 rotates and retracts the elastic curtain 71, the damping block 80 rotates together with the take-up roller 76 and intermittently squeezes the elastic block 79. When the damping block 80 and the elastic block 79 squeeze each other, a friction resistance effect is generated, resulting in a reduction in the rotation speed of the take-up roller 76. When the damping block 80 passes over the elastic block 79, the rotation speed of the take-up roller 76 is temporarily increased, thereby generating a jerky speed change effect during the rotation of the take-up roller 76. The elastic curtain 71 itself is elastic, so it can cause the elastic curtain 71 to shake while being retracted, so that dust, debris and other residues on its surface are separated from it. On the one hand, the elastic curtain 71 is kept clean, and on the other hand, the problem of the elastic curtain 71 being pierced by sharp debris during the retraction process is avoided, thereby extending the service life of the elastic curtain 71.

[0075] The surface of the reaction frame 24 is fixedly connected with mounting blocks 82 at the top and bottom of the elastic curtain 71; the mounting block 82 is fixedly connected with a sliding sleeve 83 on one side close to the elastic curtain 71; the sliding sleeve 83 is internally connected with a sliding core 84 in a sliding and sealing manner; 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; and the elastic block 79 and the sliding sleeve 83 are connected to each other through a conduit 87.

[0077] When the damping block 80 squeezes the elastic block 79, the elastic block 79 is compressed and deformed, and the air inside it is squeezed into the sliding sleeve 83 through the duct 87, pushing the sliding core 84 to extend outward and hit the elastic curtain 71, thereby 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 return to the inside of the sliding sleeve 83.

[0078] like Fig.13 As shown, a testing method of a corrugated steel recycled concrete composite arch according to the present invention comprises:

[0079] S1. Specimen preparation;

[0080] S11, mechanically rolling the flat steel plate to process it into a flat corrugated steel plate, and then using an arching device to complete arching;

[0081] S12, taking samples from the crest, middle and trough of the corrugated steel arch 11 by laser cutting, and taking samples from the flat steel plate as a control;

[0082] S13, implanting vertical connecting steel bars 12, longitudinal stress-bearing steel bars 13, and transverse connecting steel bars 14 on the corrugated steel arch 11;

[0083] S14, adding a fixing steel plate 15, a reinforcing triangular rib plate 16 and screws 17 at the end of the corrugated steel arch 11;

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

[0085] S16, installing the concrete pouring formwork, to ensure the uniform thickness of the concrete, arrange a temporary fixed support on the outside of the corrugated steel arch 11 to calibrate the thickness of the poured concrete 18;

[0086] S17, pouring concrete 18 of corresponding grade according to the test requirements, and making standard test blocks of concrete 18 according to the requirements;

[0087] S18, dismantle the formwork and maintain the corrugated steel composite arch 1;

[0088] S19. Apply white mortar and draw positioning lines on the arch surface and sides of the corrugated steel composite arch 1;

[0089] S2, loading preparation;

[0090] S21, corrugated steel composite arch 1 Under vertical uniform load, the main internal force of the arch structure is axial force. The test is carried out by single-point loading or multi-point loading. This test is carried out by three-point loading;

[0091] S22, installing the cured corrugated steel composite arch 1 onto the conversion seat 23 of the loading unit 2 and fixing it with bolts;

[0092] S23, symmetrically arrange two displacement sensors 6 with adjustable magnetic seats at sections 0, L / 8 (L is the span of the combined shallow arch), L / 4, 3L / 8, L / 2, 5L / 8, 3L / 4, 7L / 8 and L of the corrugated steel combined arch 1. 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 crest of the corrugated steel arch 11 to measure the vertical displacement of the corrugated steel combined arch 1. The average value of the measurements of the two displacement sensors 6 is taken as the final result for each section;

[0093] S24, in order to obtain the strain data of each position of the entire corrugated steel composite arch 1, the resistance strain gauges 5 are symmetrically arranged at all the eighth-point sections of the arch, wherein: the corrugated steel resistance strain gauges 5 at each eighth-point include longitudinal and transverse directions, and are symmetrically arranged at the crests, middles and troughs on both sides of the corrugated steel, and two longitudinal resistance strain gauges 5 are symmetrically arranged at each quarter point of the concrete arch surface, and in order to determine the cross-sectional strain distribution of the concrete, three resistance strain gauges 5 are arranged at the center and symmetrically on both sides of the concrete side surface at each quarter point;

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

[0095] S26, adjusting 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, using a hydraulic jack 30 for loading, the preloading force is 0.3 times the estimated limit load (Pu), the purpose is to eliminate the virtual displacement of the test device;

[0098] S32. Formal loading adopts different loading systems according to different load levels: when the load is less than 0.3Pu, graded loading is adopted, with 50kN as the first level, and then 30kN as the first level to 0.7Pu. When the load exceeds 0.7Pu, continuous loading is carried out until the specimen is destroyed (when the specimen displacement continues to increase, the jack load drops to 0.8Pu or the composite arch specimen is destroyed and is not suitable for further loading);

[0099] S4, long-term loading;

[0100] S41, preloading, using a hydraulic jack 30 for loading, the preloading force is 0.3 times the estimated limit 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 estimated value of the long-term loading load, use the nut 31 on the guide rod 26 in the loading unit 2 to lock the 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 can be used as the pressure power source for the long-term performance test of the corrugated steel composite arch 1;

[0102] S5: Experimental data collection;

[0103] The strain data was collected using the DH3816 portable dynamic signal collector, and the displacement and load data were collected using the TST3827 dynamic and static signal collector. The data were then aligned by compiling a Python script, and the data was based on the DH3816 acquisition frequency.

[0104] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, 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 so on.

[0105] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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, and therefore should not be understood as limiting the scope of protection of the present invention.

[0106] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. Corrugated steel recycled concrete composite arch, characterized by: The invention comprises a corrugated steel composite arch (1), wherein the corrugated steel composite arch (1) comprises: Corrugated steel arch (11), the flat steel plate is mechanically rolled to be processed into a flat corrugated steel plate, and then the corrugated steel arch (11) is formed using an arching device; Vertical connecting steel bars (12) are arranged at the crests and troughs of the cross section of the corrugated steel arch (11) and are evenly distributed along the span direction. The vertical connecting steel bars (12) are welded to the corrugated steel arch (11); Longitudinal stress-bearing 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 crest and trough of the wave; 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 stress-bearing steel bars (13); The fixed steel plate (15), the arch foot of the corrugated steel arch (11), the end of the longitudinal stress-bearing steel bar (13) and the fixed steel plate (15) are welded and connected; Concrete (18), the concrete (18) structure thickness is greater than 150mm.

2. The corrugated steel recycled concrete composite arch according to claim 1, characterized in that: A triangular rib plate (16) is added to the arch foot of the corrugated steel arch (11) for reinforcement, a screw (17) is added between the arch foot and the longitudinal stress-bearing steel bar (13), and the screw (17) is welded to the fixing steel plate (15) to ensure an effective connection between the concrete (18) and the fixing steel plate (15).

3. A performance loading device for a corrugated steel recycled concrete composite arch, the device being used for loading and testing the corrugated steel recycled concrete composite arch according to claim 1, characterized in that: It comprises a loading unit (2), a concrete foundation (4), a resistance strain gauge (5) and a displacement sensor (6); the loading unit (2) comprises: Base (21), two bases (21) are fixed on the concrete foundation (4) by anchor bolts to bear the load generated during the entire test process; Tie rod (22), the two bases (21) are connected by symmetrical C-shaped channel steel tie rods (22), balancing the horizontal thrust generated by the corrugated steel composite arch (1) during the test; A conversion seat (23), both ends of the corrugated steel composite arch (1) specimen are bolted to the conversion seat (23), and the lower part of the conversion seat (23) is connected to the base (21) by bolts; A reaction frame (24), the bottom of the reaction frame (24) is fixed to the concrete foundation (4) by anchor bolts, the upper part is provided with a cross beam for fixing the reaction beam (25), the middle part is provided with a limit plate with a C-shaped groove, and the two sides of the reaction frame (24) are symmetrically arranged to offset the vertical reaction force generated by the loading; A reaction beam (25), both ends of which are fixed to the reaction frames (24) on both sides by bolts, and the middle is used to fix the hydraulic jack (30) and the guide rod (26); The force transmission plate is divided into an upper force transmission plate (27) and a lower force transmission plate (28); the upper side of the upper force transmission plate (27) abuts against the end surface of the cylinder rod of the hydraulic jack (30), and the lower side is fixed with a pressure sensor (32); the upper side of the lower force transmission plate (28) abuts against the end surface of the pressure sensor (32), and the lower side is provided with two circular grooves for embedding a compression spring (33); A distribution beam (29), wherein both ends of the distribution beam (29) are provided with C-shaped convex grooves which cooperate with the C-shaped grooves on the reaction frame (24) for limiting, and the upper part is provided with two circular grooves for embedding the compression spring (33); A guide rod (26) is provided with a thread at one end thereof and connected to the reaction beam (25), and the other end thereof is a smooth rod and passes through the upper force transmission plate (27), the lower force transmission plate (28) and the distribution beam (29), and a thread is provided in the middle thereof for locking the upper force transmission plate (27) through a nut (31).

4. The performance loading device of the corrugated steel recycled concrete composite arch according to claim 3 is characterized in that: The hydraulic jack (30) is fixed on the reaction beam (25), and the end surface of the cylinder rod abuts against the upper force transmission plate (27), serving as a power source for instantaneous loading.

5. The performance loading device of the corrugated steel recycled concrete composite arch according to claim 3 is characterized in that: The compression spring (33) is arranged between the upper force transmission plate (27) and the lower force transmission plate (28) and is sleeved on the outside of the guide rod (26). After the hydraulic jack (30) is instantaneously loaded, the compression spring (33) contracts to generate spring force. The upper force transmission plate (27) is locked with a nut (31), and the hydraulic jack (30) is unloaded. At this time, the spring force serves as a power source for long-term performance loading.

6. The performance loading device of the corrugated steel recycled concrete composite arch according to claim 3 is characterized in that: The surface of the reaction frame (24) is provided with protective components at both sides of the corrugated steel composite arch (1); the protective components are used to block concrete fragments that fly outward when the corrugated steel composite arch (1) is loaded to the point of being destroyed; The protection assembly comprises a translation plate (70); an elastic curtain (71) and a scissor-type telescopic 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-type telescopic 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); and the output end of the electric telescopic rod (74) is connected to the movable block (73).

7. The performance loading device of the corrugated steel recycled concrete composite arch according to claim 6 is characterized in that: The reaction frame (24) is provided with a receiving groove (75) on its surface; a receiving roller (76) is rotatably connected inside the receiving groove (75), and the elastic curtain (71) is wound around the surface of the receiving roller (76); a coil spring (77) is provided between the receiving roller (76) and the reaction frame (24).

8. The performance loading device of the corrugated steel recycled concrete composite arch according to claim 7 is characterized in that: The top and bottom of the storage groove (75) are both provided with mounting grooves (78); an elastic block (79) is fixedly connected inside the mounting groove (78); the surfaces of both ends of the storage roller (76) extending into the mounting groove (78) are fixedly connected with damping blocks (80); and a ball (81) is rotatably connected to the surface of the damping block (80).

9. The performance loading device of the corrugated steel recycled concrete composite arch according to claim 8 is characterized in that: The surface of the reaction frame (24) is fixedly connected with mounting blocks (82) at the top and bottom of the elastic curtain (71); 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 slidingly 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); 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); and the elastic block (79) and the sliding sleeve (83) are connected to each other via a conduit (87).

10. A method for testing a corrugated steel recycled concrete composite arch, the method being used for loading testing the corrugated steel recycled concrete composite arch according to claim 1, characterized in that: include: S1. Specimen preparation; S11, mechanically rolling the flat steel plate to process it into a flat corrugated steel plate, and then using an arching device to complete arching; S12, using laser cutting to take samples from the crest, middle and trough of the corrugated steel arch (11), and taking samples from the flat steel plate as a control; S13, implanting vertical connecting steel bars (12), longitudinal stress-bearing steel bars (13), and transverse connecting steel bars (14) on the corrugated steel arch (11); S14, adding a fixing steel plate (15), a reinforcing triangular rib plate (16) and screws (17) to the end of the corrugated steel arch (11); S15. A concrete loading platform is arranged on the arch surface of the corrugated steel composite arch (1). The loading platform is only provided with a steel skeleton, which does not affect the loading test results. The number of loading platforms is consistent with the number of loading points. S16, installing a concrete pouring formwork, and arranging a temporary fixed support on the outer side of the corrugated steel arch (11) to calibrate the thickness of the poured concrete (18); S17, pouring concrete (18) of corresponding grade according to the test requirements, and making standard test blocks of concrete (18) according to the requirements; S18, removing the formwork and maintaining the corrugated steel composite arch (1); S19, applying white mortar and drawing positioning lines on the arch surface and sides of the corrugated steel composite arch (1); S2, loading preparation; S21. Corrugated steel composite arch (1) Under vertical uniform load, the main internal force of the arch structure is the axial force. Single-point loading or multi-point loading is used in the test; S22, installing the cured corrugated steel composite arch (1) onto the conversion seat (23) of the loading unit (2) and fixing it with bolts; S23, symmetrically arrange two displacement sensors (6) at the cross sections at 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 crest of the corrugated steel arch (11), and the average value of the measurements of the two displacement sensors (6) is taken as the final result for each cross section; S24, symmetrically arranging resistance strain gauges (5) at all octave cross sections of the corrugated steel composite arch (1), wherein: the corrugated steel resistance strain gauges (5) at each octave include longitudinal and transverse directions, and are symmetrically arranged at the crests, middles, and troughs on both sides of the corrugated steel; symmetrically arranging two longitudinal resistance strain gauges (5) at each quarter point of the concrete arch surface; and arranging three resistance strain gauges (5) at the center and symmetrically on both sides of the concrete side surface at each quarter point; S25. Debug the strain, displacement and load data signal acquisition instrument to ensure stable data transmission; S26, adjusting 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); S3, instantaneous loading; S31, preloading, using a hydraulic jack (30) for loading, the preloading force is 0.3 times the estimated limit load (Pu), eliminating the virtual displacement of the test device; S32. Formal loading adopts different loading systems according to different load levels: when the load is less than 0.3Pu, graded loading is adopted, with 50kN as the first level, and then 30kN as the first level to 0.7Pu. When the load exceeds 0.7Pu, continuous loading is carried out until the specimen is destroyed; S4, long-term loading; S41, preloading, using a hydraulic jack (30) for loading, the preloading force is 0.3 times the estimated limit load (Pu), eliminating the virtual displacement of the test device; S42, a constant load is set, and the hydraulic jack (30) continues to load until the data of the pressure sensor (32) read from the control system reaches the estimated value of the long-term loading load, and the nut (31) on the guide rod (26) in the loading unit (2) is used to lock the upper 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 as the pressure power source for the long-term performance test of the corrugated steel composite arch (1); S5: Experimental data collection; Use a dynamic signal acquisition instrument to collect strain data, and use a dynamic and static signal acquisition instrument to collect displacement and load data, and align the data later.

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