Steel structure anti-seismic toughness detection device and detection method

Abstract

The application discloses a kind of steel structure aseismatic ductility detection device and detection method, it is related to aseismic detection field.Proposed as follows scheme, it includes: support column, top fixed support platform;Slide, with the support platform rolling connection, and the middle part of the slide is hinged with feedback, the other end of the feedback is hinged with support platform;Steel structure connecting platform, fixed with the top of slide, surface is evenly provided with screw hole, the steel structure connecting platform is used to connect steel structure;Simulation oil cylinder, evenly distributed in the four around of simulation oil cylinder;Pressure storage component, inner cavity is communicated with multiple simulation oil cylinder.The liquid of simulation oil cylinder is controlled by pressure storage component, and pressure storage component accumulates high-pressure oil liquid in advance, and when instant high-pressure oil liquid communicated with certain simulation oil cylinder can enter simulation oil cylinder and force in this direction, so continue to replace the simulation oil cylinder of different direction and exert pressure on slide, so that slide can vibrate rapidly, simulate high-frequency seismic wave.

Description

Technical Field

[0001] This invention relates to the field of seismic testing, and more particularly to a device and method for testing the seismic toughness of steel structures. Background Technology

[0002] With the acceleration of urbanization and the widespread adoption of high-rise buildings, the seismic performance assessment of steel structures has become a core aspect of ensuring building safety. Under seismic loading, the toughness of steel structures (i.e., their ability to absorb energy and maintain function) directly determines the degree of damage to buildings and the safety of people. To accurately assess the seismic toughness of steel structures, it is necessary to simulate seismic loading and quantify the structural response through experimental methods. Currently, the industry widely adopts hydraulic servo loading systems as the core device, applying horizontal (transverse wave) or vertical (longitudinal wave) loads to reproduce the dynamic effects of seismic events.

[0003] For example, CN118603469A discloses a steel structure seismic toughness testing device and testing method, which includes four independent testing units and a steel structure shed. The bottom of the four columns of the steel structure shed are respectively fixed to the top of the four independent testing units by bolts. The independent testing unit includes a testing table. The top of the testing table is provided with a transition groove, and an adjustment table is rotatably installed inside the transition groove.

[0004] However, existing technologies have significant shortcomings in practical applications, especially in high-frequency vibration simulation, which urgently needs breakthroughs. For example, the vibration frequency of a hydraulic cylinder is directly limited by the rate of oil injection / discharge. Existing hydraulic systems are limited by servo valve response delays and pump flow rate, resulting in loading frequencies typically below 5Hz. However, the high-frequency components of actual seismic waves correspond to local structural resonances or equipment responses, and existing devices cannot reproduce such high-frequency loads, leading to underestimation of the structural dynamic response in experimental results. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a steel structure seismic toughness testing device and testing method to simulate high-frequency seismic waves and complex seismic waves, thereby improving the accuracy of the test.

[0006] To achieve the above-mentioned technical objectives, the present invention provides a device and method for testing the seismic toughness of steel structures:

[0007] It includes: a support column with a support platform fixed at the top; a slide table that is rotatably connected to the support platform, and a feedback device is hinged to the middle of the slide table, with the other end of the feedback device hinged to the support platform; a steel structure connecting platform fixed to the top of the slide table, with screw holes evenly distributed on its surface, the steel structure connecting platform being used to connect steel structures; simulated hydraulic cylinders evenly distributed around the simulated hydraulic cylinders, with the output part of the simulated hydraulic cylinders abutting against the edge of the slide table, used to simulate transverse or longitudinal waves of different frequency bands; a pressure accumulator assembly, the inner cavity of which is connected to multiple simulated hydraulic cylinders, used to control the liquid intake of the simulated hydraulic cylinders in different directions; and a booster pump, the outlet end of which is connected to the pressure accumulator assembly through a pipe.

[0008] Preferably, the feedback device includes: a sleeve, one end of which is hinged to the slide table; a push-pull rod, one end of which is hinged to the support platform and the other end of which is slidably connected to the sleeve; and a spring, which is disposed inside the spring and whose two ends abut against the push-pull rod and the sleeve, respectively.

[0009] Preferably, the simulated hydraulic cylinder includes: a cylinder barrel with a cylinder rod slidably and sealed inside, and the end of the cylinder rod away from the cylinder barrel abutting against a slide table; an inlet pipe, the inner cavity of the cylinder barrel being connected to a pressure accumulator assembly through the inlet pipe; and a solenoid valve fixed to the cylinder barrel.

[0010] Preferably, the pressure accumulator assembly includes: a pressure accumulator box fixed to a support column; a valve cylinder rotatably and sealingly connected to the inside of the pressure accumulator box, wherein a through hole is provided on the outer surface of the valve cylinder; and a motor fixed to the pressure accumulator box, wherein the output end is fixedly connected to the top of the valve cylinder.

[0011] Preferably, the support platform includes: a fixed platform, fixedly connected to the support column; a connecting platform, fixedly connected to the fixed platform; a ball bearing, embedded in the fixed platform and slidably connected to the fixed platform; and a limiting cover plate, fixed to the surface of the fixed platform, for limiting the movement of the ball bearing.

[0012] Preferably, the inlet end of the booster pump is connected to a return oil tank via a pipeline, and the inner cavity of the return oil tank is connected to a solenoid valve via a pipeline.

[0013] Preferably, it further includes:

[0014] The first acquisition module is used to acquire the instantaneous force applied to the slide table;

[0015] The second acquisition module is used to acquire the displacement of the steel structure.

[0016] The third acquisition module is used to acquire the strain force of the steel structure connection nodes;

[0017] The fourth acquisition module is used to acquire the acceleration of the steel structure;

[0018] The analysis module calculates the toughness index based on instantaneous force, displacement, strain force, and acceleration formulas, and compares the toughness index with the preset toughness index to determine whether it is qualified.

[0019] Preferably, it further includes: columns distributed around the steel structure connection platform, and the second acquisition module is fixed on the columns.

[0020] A method for testing the seismic toughness of steel structures, based on the aforementioned seismic toughness testing device for steel structures, includes the following steps:

[0021] The steel structure is installed and fixed onto the steel structure connection platform, and the third and fourth acquisition modules are installed at the connection nodes of the steel structure.

[0022] Start the booster pump and accumulator assembly. The booster pump provides high-pressure oil to the accumulator assembly, and the accumulator assembly circulates the high-pressure oil to the simulated cylinders in different positions, causing the simulated cylinders to push the slide table to vibrate on the support column.

[0023] The system presets the testing time and intensity. During the testing process, it collects seismic data. Once the preset testing time is reached, the collection of seismic data stops. The seismic data includes instantaneous force, displacement, strain, and acceleration.

[0024] Determine whether the current steel structure is up to standard based on seismic data.

[0025] Preferably, the method for determining whether the current steel structure is qualified includes:

[0026] The toughness index is calculated using formulas based on instantaneous force, displacement, strain, and acceleration.

[0027] The toughness index is compared with the preset toughness index. If the toughness index is greater than the preset toughness index, it is judged as qualified.

[0028] If the toughness index is less than the preset toughness index, it is judged as unqualified.

[0029] As can be seen from the above technical solutions, this application has the following beneficial effects:

[0030] 1: By distributing multiple simulated hydraulic cylinders around the outer periphery of the slide table and controlling the fluid intake of the simulated hydraulic cylinders through a pressure accumulator, the pressure accumulator accumulates high-pressure hydraulic fluid in advance. When it is connected to a simulated hydraulic cylinder, the high-pressure hydraulic fluid can enter the simulated hydraulic cylinder and apply force to that position. By continuously changing the simulated hydraulic cylinders in different positions to apply pressure to the slide table, the slide table can be made to vibrate rapidly, simulating high-frequency seismic waves.

[0031] 2: By rolling the slide table onto the support platform, the vibration friction of the slide table is reduced, and the force feedback of the feedback device assists the slide table in generating vibration. In conjunction with the multi-directional simulated hydraulic cylinder, it provides more complex seismic waves and improves the realism of the detection. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 A schematic diagram of the overall structure of a steel structure seismic toughness testing device provided by the present invention; Figure 2 This invention provides a partial cross-sectional structural schematic diagram of a steel structure seismic toughness testing device. Figure 3 This is a cross-sectional structural schematic diagram of a steel structure seismic toughness testing device provided by the present invention; Figure 4 A schematic diagram of the overall structure of the slide table for a steel structure seismic toughness testing device provided by the present invention; Figure 5 A schematic diagram of the overall structure of the support column of the steel structure seismic toughness testing device provided by the present invention; Figure 6 A schematic diagram of the overall structure of the simulated hydraulic cylinder and accumulator assembly of a steel structure seismic toughness testing device provided by the present invention; Figure 7 This is a schematic diagram of the analysis module structure of a steel structure seismic toughness testing device provided by the present invention.

[0034] Figure Descriptions: 1. Support column; 11. Support platform; 111. Fixed platform; 112. Connecting platform; 113. Ball bearing; 114. Limiting cover plate; 2. Slide table; 21. Feedback device; 211. Sleeve; 212. Push-pull rod; 213. Spring; 3. Steel structure connecting platform; 4. Simulated hydraulic cylinder; 41. Cylinder barrel; 42. Cylinder rod; 43. Inlet pipe; 44. Solenoid valve; 5. Accumulator assembly; 51. Accumulator tank; 52. Valve cylinder; 53. Motor; 6. Booster pump; 7. Return oil tank. Detailed Implementation

[0035] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of the various embodiments of this disclosure. Certain details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures.

[0036] Example 1, see Figure 1-7 As shown, a steel structure seismic toughness testing device includes a support column 1, a slide 2, a steel structure connection platform 3, a simulated hydraulic cylinder 4, a pressure accumulator 5, and a booster pump 6. The support platform 11 is fixed to the top of the support column 1, and the slide 2 is rotatably connected to the support platform 11. The steel structure connection platform 3 is fixed to the top of the slide 2. The surface of the steel structure connection platform 3 is uniformly provided with screw holes to accommodate steel structures with different hole spacings. The simulated hydraulic cylinders 4 are evenly distributed around the simulated hydraulic cylinders 4, and the output part of the simulated hydraulic cylinders 4 abuts against the edge of the slide 2 to simulate transverse or longitudinal waves of different frequencies. The inner cavity of the pressure accumulator 5 is connected to multiple simulated hydraulic cylinders 4 to control the liquid intake of simulated hydraulic cylinders 4 in different directions. The outlet end of the booster pump 6 is connected to the pressure accumulator 5 through a pipe.

[0037] It is worth mentioning that the simulated hydraulic cylinder 4 and the booster pump 6 are arranged separately from the support column 1 to avoid the impact of the vibration of the slide table 2 on the simulated hydraulic cylinder 4 and the booster pump 6.

[0038] For further details, please refer to [link / reference]. Figure 3 As shown, a feedback device 21 is hinged to the middle of the slide table 2, and the other end of the feedback device 21 is hinged to the support platform 11. The feedback device 21 includes a sleeve 211, a push-pull rod 212, and a spring 213. The end of the sleeve 211 is hinged to the slide table 2, one end of the push-pull rod 212 is hinged to the support platform 11, and the other end of the push-pull rod 212 is slidably connected to the sleeve 211. The spring 213 is set inside the slide table 212, and the two ends of the spring 213 abut against the push-pull rod 212 and the sleeve 211, respectively. When the slide table 2 is subjected to a force applied by the simulated cylinder 4 in a certain direction and slides in a certain direction, it will squeeze the push-pull rod 212, thereby squeezing the spring 213 to store force. When the simulated cylinder 4 in that direction loses oil, the force stored in the spring 213 is fed back to the push-pull rod 212, so that the push-pull rod 212 feeds back to the slide table 2. This reciprocating operation causes the slide table 2 to vibrate repeatedly, simulating vibration waves.

[0039] For further details, please refer to [link / reference]. Figure 2 As shown, the simulated hydraulic cylinder 4 includes a cylinder barrel 41, an inlet pipe 43, and a solenoid valve 44. The cylinder barrel 41 is internally connected to a cylinder rod 42 with a sliding seal, and the end of the cylinder rod 42 away from the cylinder barrel 41 abuts against the slide table 2. The inner cavity of the cylinder barrel 41 is connected to the accumulator assembly 5 through the inlet pipe 43. The solenoid valve 44 is fixed on the cylinder barrel 41. When oil enters the cylinder barrel 41 through the inlet pipe 43, the solenoid valve 44 closes; otherwise, the solenoid valve 44 opens to discharge the oil from the cylinder barrel 41.

[0040] The pressure accumulator assembly 5 includes a pressure accumulator 51, a valve cylinder 52, and a motor 53. The pressure accumulator 51 is fixed on the support column 1. The valve cylinder 52 is rotatably and sealed inside the pressure accumulator 51. A through hole is opened on the outer surface of the valve cylinder 52. The motor 53 is fixed on the pressure accumulator 51, and its output end is fixedly connected to the top of the valve cylinder 52.

[0041] For example, when the motor 53 drives the valve cylinder 52 to rotate, when the connection point between the through hole and the inlet pipe 43 and the accumulator 51 coincides, the high-pressure oil accumulated in the accumulator 51 will instantly enter the cylinder 41 to push the cylinder rod 42; this process repeats. When the through hole and the inlet pipe 43 do not coincide, the accumulator 51 is completely sealed. At this time, the booster pump 6 replenishes hydraulic oil into the accumulator 51; this process repeats to control the cylinders 41 in multiple directions to work in turn, simulating complex seismic waves.

[0042] It is worth mentioning that, in some embodiments, the accumulator 51 can be designed as multiple, further increasing the liquid inlet speed of multiple simulated hydraulic cylinders 4.

[0043] Specifically, the support platform 11 includes a fixed platform 111, a ball bearing 113, and a limiting cover plate 114. The fixed platform 111 is fixedly connected to the support column 1, and the connecting platform 112 is fixedly connected to the fixed platform 111. The ball bearing 113 is embedded in the fixed platform 111 and slidably connected to the fixed platform 111. The limiting cover plate 114 is fixed to the surface of the fixed platform 111 and is used to limit the ball bearing 113. The slide 2 is slidably connected to the ball bearing 113 to reduce the sliding friction of the slide 2.

[0044] The inlet of the booster pump 6 is connected to the return oil tank 7 via a pipe, and the inner cavity of the return oil tank 7 is connected to the solenoid valve 44 via a pipe. The return oil tank 7 is used to store oil.

[0045] Example 2: Based on the above examples, a steel structure seismic toughness testing device further includes a first acquisition module, a second acquisition module, a third acquisition module, and a fourth acquisition module, wherein the modules are connected to each other via wired and / or wireless means.

[0046] The first acquisition module is used to acquire the instantaneous force applied to the slide table 2. The first acquisition module adopts a pressure sensor, which is installed on the simulated oil cylinder 4 to acquire the force applied to the slide table 2.

[0047] The second acquisition module is used to collect the displacement of the steel structure, characterize the deformation capacity and failure process of the structure. The steel structure connection platform 3 is surrounded by columns. The columns do not contact the steel structure connection platform 3 to avoid the impact of vibration on the columns. The second acquisition module uses a laser displacement meter or LVDT, which is installed and fixed on the columns.

[0048] The third acquisition module is used to acquire the strain force of the steel structure connection nodes. The third acquisition module uses strain gauges, which are installed at the connection nodes of the steel structure to determine whether yielding or local buckling cracking has occurred.

[0049] The fourth acquisition module is used to acquire the acceleration of the steel structure. The fourth acquisition module uses an accelerometer, and the acceleration is used to determine the changes in the intensity and periodic characteristics of the structural vibration.

[0050] The analysis module calculates the toughness index based on instantaneous force, displacement, strain force, and acceleration formulas, and compares the toughness index with the preset toughness index to determine whether it is qualified.

[0051] It should be noted that the specific calculation formula and preset toughness index are determined by those skilled in the art based on the actual situation. For example, the toughness index can be obtained by calculating energy dissipation, ductility ratio, stiffness degradation ratio and damage index, and then normalizing them. The specific calculation method is not specifically limited here.

[0052] A method for testing the seismic toughness of steel structures, based on the aforementioned seismic toughness testing device for steel structures, includes the following steps:

[0053] The steel structure is installed and fixed onto the steel structure connection platform 3, and the third and fourth acquisition modules are installed at the connection nodes of the steel structure.

[0054] Start the booster pump 6 and the accumulator assembly 5. The booster pump 6 provides high-pressure oil to the accumulator assembly 5. The accumulator assembly 5 circulates the high-pressure oil to the simulated cylinders 4 in different positions, so that the simulated cylinders 4 push the slide table 2 to vibrate on the support column 1.

[0055] The system presets the testing time and intensity. During the testing process, it collects seismic data. Once the preset testing time is reached, the collection of seismic data stops. The seismic data includes instantaneous force, displacement, strain, and acceleration.

[0056] Determine whether the current steel structure is up to standard based on seismic data.

[0057] Methods for determining whether a current steel structure is qualified include:

[0058] The toughness index is calculated using formulas based on instantaneous force, displacement, strain, and acceleration.

[0059] The toughness index is compared with the preset toughness index. If the toughness index is greater than the preset toughness index, it is judged as qualified.

[0060] If the toughness index is less than the preset toughness index, it is judged as unqualified.

[0061] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A device for testing the seismic toughness of steel structures, characterized in that, include: Support column (1), with a support platform (11) fixed on top; The slide (2) is slidably connected to the support platform (11), and a feedback device (21) is hinged in the middle of the slide (2), and the other end of the feedback device (21) is hinged to the support platform (11). The steel structure connection platform (3) is fixed to the top of the slide (2) and has screw holes evenly opened on its surface. The steel structure connection platform (3) is used to connect the steel structure. Simulated cylinders (4) are evenly distributed around the simulated cylinders (4), and the output part of the simulated cylinders (4) abuts against the edge of the slide (2) to simulate transverse or longitudinal waves of different frequency bands. The accumulator assembly (5) has an inner cavity connected to multiple simulated oil cylinders (4) for controlling the liquid intake of the simulated oil cylinders (4) in different positions; The booster pump (6) has its outlet end connected to the accumulator assembly (5) via a pipeline; The feedback unit (21) includes: The sleeve (211) is hinged at its end to the slide (2); The push-pull rod (212) is hinged at one end to the support platform (11) and slidably connected to the sleeve (211) at the other end; A spring (213) is disposed inside the spring (213), and the two ends of the spring (213) abut against the push-pull rod (212) and the sleeve (211) respectively.

2. The seismic toughness testing device for steel structures according to claim 1, characterized in that, The simulated hydraulic cylinder (4) includes: The cylinder (41) has a cylinder rod (42) that is internally slidably sealed and connected, and the end of the cylinder rod (42) away from the cylinder (41) abuts against the slide (2); The cylinder (41) is connected to the accumulator assembly (5) via the inlet pipe (43); the solenoid valve (44) is fixed on the cylinder (41).

3. The seismic toughness testing device for steel structures according to claim 1, characterized in that, The accumulator assembly (5) includes: The accumulator (51) is fixed on the support column (1); The valve cylinder (52) is rotatably and sealedly connected to the accumulator (51), and the outer surface of the valve cylinder (52) is provided with a through hole; The motor (53) is fixed on the accumulator (51), and its output end is fixedly connected to the top of the valve cylinder (52).

4. The seismic toughness testing device for steel structures according to claim 1, characterized in that, The support platform (11) includes: The fixed platform (111) is fixedly connected to the support column (1); The connecting platform (112) is fixedly connected to the fixed platform (111); The ball bearing (113) is embedded in the fixed platform (111) and slidably connected to the fixed platform (111); The limiting cover (114) is fixed to the surface of the fixed platform (111) and is used to limit the ball (113).

5. The seismic toughness testing device for steel structures according to claim 1, characterized in that, The inlet of the booster pump (6) is connected to the return oil tank (7) via a pipe, and the inner cavity of the return oil tank (7) is connected to the solenoid valve (44) via a pipe.

6. The seismic toughness testing device for steel structures according to claim 1, characterized in that, Also includes: The first acquisition module is used to acquire the instantaneous force applied to the slide (2); The second acquisition module is used to acquire the displacement of the steel structure. The third acquisition module is used to acquire the strain force of the steel structure connection nodes; The fourth acquisition module is used to acquire the acceleration of the steel structure; The analysis module calculates the toughness index based on instantaneous force, displacement, strain force, and acceleration formulas, and compares the toughness index with the preset toughness index to determine whether it is qualified.

7. The seismic toughness testing device for steel structures according to claim 6, characterized in that, Also includes: It also includes columns distributed around the steel structure connection platform (3), and the second acquisition module is fixed on the columns.

8. A method for testing the seismic toughness of steel structures, implemented based on the seismic toughness testing device for steel structures as described in claim 7, characterized in that, The methods include: The steel structure is installed and fixed on the steel structure connection platform (3), and the third acquisition module and the fourth acquisition module are installed at the connection node of the steel structure; Start the booster pump (6) and the accumulator assembly (5). The booster pump (6) provides high-pressure oil to the accumulator assembly (5). The accumulator assembly (5) circulates the high-pressure oil to the simulated cylinders (4) in different positions, so that the simulated cylinders (4) push the slide (2) to vibrate on the support column (1). The system presets the testing time and intensity. During the testing process, it collects seismic data. Once the preset testing time is reached, the collection of seismic data stops. The seismic data includes instantaneous force, displacement, strain, and acceleration. Determine whether the current steel structure is up to standard based on seismic data.

9. The method for testing the seismic toughness of steel structures according to claim 8, characterized in that, Methods for determining whether a current steel structure is qualified include: The toughness index is calculated using formulas based on instantaneous force, displacement, strain, and acceleration. The toughness index is compared with the preset toughness index. If the toughness index is greater than the preset toughness index, it is judged as qualified. If the toughness index is less than the preset toughness index, it is judged as unqualified.

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