Earthquake simulation vibration table experimental device and experimental method thereof

Abstract

The embodiment of the invention provides an earthquake simulation vibration table experiment device and an experiment method thereof, and relates to the technical field of earthquake simulation experiments. An earthquake simulation vibration table experiment device comprises a bottom frame, protective covers are longitudinally arranged at the four corners of the bottom frame, air boxes with air holes are transversely arranged at the bottoms of the protective covers, and supports distributed with the protective covers and the air boxes in a staggered mode are fixed to the outer side of the bottom frame. Springs are longitudinally arranged on the four supports in an array mode, a top table is fixed to the springs, a simulation assembly used for the top table to simulate high mountain, plain and basin scenes is vertically arranged in the middle of the bottom frame, and a shaking assembly used for the top table to switch and simulate a seismic source is arranged on the four protective covers; the simulation assembly comprises a servo motor embedded in one side of the bottom frame, and an output shaft of the servo motor is sleeved with a driving gear. A high-efficiency and accurate earthquake simulation effect is realized under the conditions of various terrain scene simulation and multidirectional different earthquake feelings.

Description

Technical Field

[0001] This invention belongs to the field of earthquake simulation experiment technology, and particularly relates to an earthquake simulation shaking table experimental device and its experimental method. Background Technology

[0002] Earthquake simulation experiments are practical methods that simulate the earthquake occurrence process and building response using physical models or digital technology. They are mainly divided into two categories: causal simulation and building seismic resistance testing. In order to better demonstrate earthquake simulation experiments, a shaking table needs to be built as an experimental carrier for intuitive and more accurate three-dimensional understanding.

[0003] The existing technology (patent application CN108827570B, entitled "An Experimental Device and Method for an Earthquake Simulation Shaking Table") has the advantages of good control performance and strong site adaptability. However, in the process of implementing this technical solution, at least the following problems were found in the existing technology: During the use of shaking tables for causal simulation and seismic testing of buildings, different terrain scenarios are mostly simulated using artificial sand table models. However, different sand tables need to be changed when simulating earthquake experiments under each terrain scenario, which is extremely troublesome, laborious, inefficient, and costly. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art that prevent the achievement of efficient and accurate earthquake simulation results under various terrain scenarios and different seismic sensing conditions. To this end, this application proposes an earthquake simulation shaking table experimental apparatus and its experimental method.

[0005] To achieve the above objectives, the specific technical solution of the present invention is as follows: An earthquake simulation shaking table experimental device includes a base frame, with protective covers placed longitudinally at each of the four corners of the base frame, and a wind box with air holes placed horizontally at the bottom of the protective covers. Supports are fixed on the outside of the base frame and are distributed alternately with the protective covers and the wind box. Additionally, springs are arranged vertically on the four supports, and a top platform is fixed on the springs. Simulation components for simulating mountain, plain, and basin scenes are vertically arranged in the middle of the base frame, and swaying components for switching simulated seismic sources are arranged on the four sets of protective covers. Furthermore, the simulation component includes a servo motor embedded on one side of the base frame, and a drive gear is mounted on the output shaft of the servo motor. The wobbling component includes a lower driven gear meshing with the bottom of the drive gear, and a main synchronous pulley fixed to the bottom of the lower driven gear.

[0006] Preferably, the simulation component further includes an upper driven gear disposed above the drive gear, and a first electric push rod that rotates and engages with the base frame is longitudinally disposed on the upper driven gear, and a threaded rod that slides and engages with the base frame is sleeved on the outer side of the first electric push rod.

[0007] Preferably, the threaded rod is threadedly connected to a threaded cylinder on its outer side, and a vibration motor is provided on the top of the threaded cylinder. A first universal joint is fixed on the top of the vibration motor, and a square airbag is sleeved on the outside of the first universal joint and fixed to the top platform.

[0008] Preferably, the square airbag is circumferentially embedded with magnet blocks for adsorbing plastic vegetation and rocks, and the plastic vegetation and rocks are positioned by adsorbing and positioning with the magnet blocks through fixed magnets with opposite magnetic poles, and a first vibration sensor is provided on the top of the first universal frame.

[0009] Preferably, the swaying assembly further includes a slave synchronous pulley outside the main synchronous pulley via a synchronous belt drive, and a main gear is fixed on the top of the four sets of slave synchronous pulleys, and a differential pulley is provided on the outside of the four sets of main gears.

[0010] Preferably, the four sets of differential wheels are fixed with second electric push rods that are matched with the rotation of the protective cover, and cams are sleeved on the four second electric push rods, with lifting heads sliding on the cams, and lifting cylinders that slide with the protective cover are longitudinally placed on the four lifting heads.

[0011] Preferably, the outer side of the main synchronous pulley has a tensioning pulley that rotates with the synchronous belt and rotates in coordination with the base frame, and electric telescopic rods are embedded in the four lifting cylinders, with spring seats fixed on the piston rods of the four electric telescopic rods.

[0012] Preferably, the top of the four elastic seats is provided with a top rod that slides with the lifting cylinder, and a second universal bracket fixed to the top platform is fixed on the four top rods. A second vibration sensor that works in conjunction with the first vibration sensor is provided on the top of the top platform near the second universal bracket.

[0013] Preferably, the four sets of protective covers are horizontally positioned with warning lights on their outer sides, and universal wheels for displacement of the top platform are fixed at the bottom of the four supports, and the four sets of springs are distributed in an axisymmetric manner along the longitudinal axis of the top platform.

[0014] A method for earthquake simulation shaking table experiments includes the following steps: Step 1: First, control the first electric push rod to adjust the meshing stroke of the upper driven gear and the drive gear to the correct position. Then, control the servo motor to drive the threaded cylinder through the threaded rod to adjust the three states of rising, resetting and falling. Control the square airbag to form various terrain scenes such as mountains, plains, hills, basins and lakes. The vibration motor will simulate earthquake sources with different degrees of vibration to complete the experimental work of different terrain scenes under the earthquake at the top of the platform. Step 2: After selecting one of the four directions of the top platform as the main vibration source, first control the second electric push rod at the main vibration source in that direction to adjust the meshing stroke of the differential wheel and the main gear to the correct position. Then, the lower driven gear drives the main gears on the four sets of driven synchronous wheels to rotate linearly through the main synchronous wheel and the four sets of tensioning wheels. Step 3: Then, the four sets of main gears drive the cams on them to drive the lifting head to drive the top rod on the lifting cylinder to move up and down repeatedly. The second universal joint drives one corner of the top platform, which serves as the main seismic source, to shake. This process is repeated to complete the experimental work on different terrain scenarios under the lateral earthquake of the top platform.

[0015] The earthquake simulation shaking table experimental apparatus and method of the present invention have the following advantages: 1. The earthquake simulation shaking table experimental device and its experimental method, when simulating different terrain scenarios, firstly, the meshing stroke between the drive gear and the upper driven gear is adjusted by the first electric push rod, and then the servo motor drives the first universal frame to lift and pull the square airbag to different degrees through the threaded cylinder on the threaded rod, so as to realize the simulation effect of various terrain scenarios such as mountains, plains, hills, basins and lakes. The vibration motor realizes the simulation effect of the earthquake source in the center. There is no need to frequently change different types of artificial sand tables. It is convenient, fast, efficient and low cost.

[0016] 2. The earthquake simulation shaking table experimental device and its experimental method, when simulating earthquake sensation in different directions, firstly, the meshing stroke between the four sets of main gears and the four sets of differential gears is adjusted sequentially by four second electric push rods, and then the servo motor drives the cams on the four sets of slave synchronous gears to rotate in succession through the main synchronous gear on the lower slave gear. Each time, the cam drives the top rod at different directions through the lifting cylinder on the lifting head to realize different degrees of earthquake sensation on the top platform, thereby achieving the simulation effect of earthquake sensation in different directions.

[0017] 3. This earthquake simulation shaking table experimental device and its experimental method, during the simulation of different terrain scenarios using square airbags, firstly, four sets of continuously rotating synchronous pulleys drive four sets of blowers to generate wind pressure in four sets of air boxes. The wind pressure in the four sets of air boxes is then supplied unidirectionally into a pressurization tank for temporary storage through four blower nozzles. The three-way valves on the four pressurization pipes supply the air to square airbags of different shapes through four hoses, causing them to expand and increasing the hardness of the square airbags. Alternatively, the pressurized gas in the square airbags can be pressurized and discharged through four pressure relief nozzles to reduce the hardness of the square airbags and make them softer. The hardness of the square airbags can be adaptively adjusted according to the requirements of different terrain scenarios, making the experiment closer to reality. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a diagram showing the earthquake simulation state of a shaking table experimental device for earthquake simulation in a plain terrain. Figure 2 This is a diagram illustrating the earthquake simulation state of a shaking table experimental device with a mountainous terrain centered on the structure, according to the present invention. Figure 3 This is a diagram showing the earthquake simulation state of a shaking table experimental device based on the present invention, with the basin topography centered. Figure 4 This is a diagram illustrating the lateral seismic simulation state of a seismic simulation shaking table experimental device in a plain terrain, according to the present invention. Figure 5 This is a top view of the simulated component structure of the present invention; Figure 6 This is a bottom view of the simulated component structure of the present invention; Figure 7 This is a side cross-sectional view of the simulated component structure of the present invention; Figure 8 This is a side view of the swaying component structure of the present invention; Figure 9 This is a partial top view of the swaying component structure of the present invention; Figure 10 This is a partial side view of the swaying component structure of the present invention; Figure 11 This is a front view of the inflatable component structure of the present invention; Figure 12 This is a partial bottom view of the simulated component structure of the present invention.

[0020] Explanation of markings in the diagram: 1. Base frame; 2. Protective cover; 3. Airbox; 4. Bracket; 5. Spring; 6. Top platform; 71. Servo motor; 72. Drive gear; 73. Upper driven gear; 74. First electric push rod; 75. Threaded rod; 76. Threaded cylinder; 77. Vibration motor; 78. First universal joint; 79. Square airbag; 81. Lower driven gear; 82. Main synchronous pulley; 83. Driven synchronous pulley; 84. Main gear; 85. Differential. 86. Wheel; 87. Second electric push rod; 88. Cam; 89. Lifting head; 90. Lifting cylinder; 91. Blower fan; 92. Blower nozzle; 93. Pressure tank; 94. Pressure pipe; 95. Three-way valve; 96. Pressure relief nozzle; 97. Hose; 10. Magnet block; 11. First vibration sensor; 12. Tensioning wheel; 13. Electric telescopic rod; 14. Elastic seat; 15. Top rod; 16. Second universal bracket; 17. Second vibration sensor. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments: like Figures 1-12 As shown, an earthquake simulation shaking table experimental device of the present invention includes a base frame 1, with protective covers 2 longitudinally placed at the four corners of the base frame 1, warning lights horizontally placed on the outer side of the four sets of protective covers 2 to warn of the experimental operation status, and a wind box 3 with air holes horizontally placed at the bottom of the protective cover 2, and a support 4 fixed on the outer side of the base frame 1 in an alternating manner with the protective covers 2 and the wind box 3. Furthermore, springs 5 ​​are arranged longitudinally on four supports 4, and a top platform 6 is fixed on the springs 5. Universal wheels for displacement of the top platform 6 are fixed at the bottom of the four supports 4, which facilitates the movement of the experimental device. The four sets of springs 5 ​​are distributed in an axisymmetric state along the longitudinal axis of the top platform 6, which provides uniform elastic support around the top platform 6 so that the top platform 6 can change shape in response to the experimental action.

[0022] Furthermore, a simulation component for simulating mountain, plain and basin scenes is vertically arranged in the middle of the base frame 1. The simulation component includes a servo motor 71 embedded on one side of the base frame 1, and a drive gear 72 is sleeved on the output shaft of the servo motor 71. The simulation component also includes an upper driven gear 73 arranged above the drive gear 72, and a first electric push rod 74 that rotates with the base frame 1 is longitudinally arranged on the upper driven gear 73. The meshing stroke between the drive gear 72 and the upper driven gear 73 is adjusted by the first electric push rod 74. Furthermore, a threaded rod 75 that slides with the base frame 1 is sleeved on the outer side of the first electric push rod 74. A threaded cylinder 76 is threadedly connected to the outer side of the threaded rod 75. The servo motor 71 drives the first universal joint 78 to lift and pull the square airbag 79 to different degrees through the threaded cylinder 76 on the threaded rod 75, thereby simulating various terrain scenes such as mountains, plains, hills, basins and lakes. A vibration motor 77 is set on the top of the threaded cylinder 76, and the first universal joint 78 and the square airbag 79 sleeved on the outer side of the first universal joint 78 are fixed on the top of the vibration motor 77 and fixed to the top platform 6. The vibration motor 77 realizes the simulation effect of the centered earthquake source, without the need to frequently change different types of artificial sand tables. It is convenient, fast, efficient and low cost. The square airbag 79 is surrounded by magnetic blocks 10 for adsorbing plastic vegetation and rocks. The plastic vegetation and rocks are adsorbed and positioned by the magnetic blocks 10 through fixed magnets with opposite magnetic poles. The magnetic blocks 10 and fixed magnets make it easy to magnetically adsorb plastic vegetation and rocks onto the square airbag 79 under different terrain scenarios, so as to more intuitively observe the damage intensity caused by the earthquake. A first vibration sensor 11 is set on the top of the first universal joint 78 to monitor the vibration in the middle in real time.

[0023] like Figures 8-10 As shown, four sets of protective covers 2 are provided with swaying components for switching simulated vibration sources on the top platform 6. The swaying components include a lower driven gear 81 meshing with the bottom of the drive gear 72, and a main synchronous pulley 82 fixed to the bottom of the lower driven gear 81. The swaying components also include a driven synchronous pulley 83 driven by a synchronous belt on the outside of the main synchronous pulley 82. A main gear 84 is fixed on the top of the four sets of driven synchronous pulleys 83, and a differential pulley 85 is provided on the outside of the four sets of main gears 84. The meshing stroke between the four sets of main gears 84 and the four sets of differential pulleys 85 is adjusted sequentially by four second electric push rods 86. Four sets of differential wheels 85 are fixed to the outside of the second electric push rods 86 that are matched with the rotation of the protective cover 2. The four second electric push rods 86 are fitted with cams 87. The servo motor 71 drives the cams 87 on the four sets of slave synchronous wheels 83 to rotate in succession through the main synchronous wheel 82 on the lower slave gear 81. Lifting heads 88 slide on the cams 87, and lifting cylinders 89 that slide with the protective cover 2 are longitudinally arranged on the four lifting heads 88. Each time, the cams 87 drive the top rods 15 in different directions through the lifting cylinders 89 on the lifting heads 88 to achieve different degrees of vibration on the top platform 6, thereby simulating the earthquake vibration effect in different directions. The outer side of the main synchronous pulley 82 has a tensioning pulley 12 that rotates with the synchronous belt tension adjustment and rotates with the base frame 1 to adjust the tension of the synchronous belt between the main synchronous pulley 82 and the four sets of driven synchronous pulleys 83, so that the main synchronous pulley 82 can effectively drive the four sets of driven synchronous pulleys 83 to rotate, so as to prevent the phenomenon of free rotation. The four lifting cylinders 89 are embedded with electric telescopic rods 13, and spring seats 14 are fixed on the piston rods of the four electric telescopic rods 13. The top of the four spring seats 14 is longitudinally placed with a top rod 15 that slides with the lifting cylinder 89, and the four top rods 15 are fixed with a second universal bracket 16 that is fixed to the top platform 6. If it is necessary to strengthen the intensity of the main vibration source in this direction, the electric telescopic rod 13 in the lifting cylinder 89 in this direction is opened and the top rod 15 is driven to move upward through the spring seat 14, increasing the height stroke of the top rod 15 and making the top platform 6 shake more violently. A second vibration sensor 17, which works in conjunction with the first vibration sensor 11, is installed on the top of the top platform 6 near the second universal joint 16 to monitor the aftershocks of the top platform 6 during a central earthquake and to monitor the four-way vibrations of the top platform 6 during a lateral earthquake.

[0024] like Figure 11 As shown, during the simulation of various terrain scenarios such as mountains, plains, hills, basins and lakes using square airbags 79, the softness and hardness of the square airbags 79 cannot be adjusted according to the simulated terrain scenario, making the earthquake simulation experiment not close to the real terrain and reducing the accuracy of the earthquake simulation experiment. The four sets of air boxes 3 are equipped with an inflation component for adjusting the softness and hardness of the square airbags 79, and the inflation component includes a blower fan 91 fixed at the bottom of the four sets of synchronous pulleys 83, and forms wind pressure in the four sets of air boxes 3. The four sets of blower fans 91 are driven by the continuously rotating four sets of synchronous pulleys 83 to generate wind pressure in the four sets of air boxes 3. The inner side of the four sets of air boxes 3 is connected to the pressurization tank 93 fixed to the bracket 4 through the blower nozzle 92. The air pressure in the four sets of air boxes 3 is supplied to the pressurization tank 93 for temporary storage through the four blower nozzles 92. The outer end of the pressurization tank 93 is connected to the pressurization pipe 94 with a three-way valve 95. The three-way valve 95 is designed with a quantitative sensor. The four three-way valves 95 are connected to the pressure relief nozzle 96. The four pressurization pipes 94 are connected to the flexible hose 97 for inflating the square airbag 79. The hoses 97 pass through the top platform 6 and are connected to the square airbag 79. The air pressure is supplied to the square airbags 79 of different shapes through the three-way valves 95 on the four pressurization pipes 94 and the four flexible hoses 97, so that they expand and increase the rigidity of the square airbags 79. Four three-way valves 95 control four pressure relief nozzles 96 to pressurize and release the gas inside the square airbag 79, reducing the hardness of the square airbag 79 and making it softer. The hardness of the square airbag 79 can be adaptively adjusted according to different terrain requirements, making the experiment closer to reality.

[0025] A method for earthquake simulation shaking table experiments includes the following steps: Step 1: When simulating a high-altitude scene according to the experimental requirements, first control the first electric push rod 74 to open and drive the upper driven gear 73 to move down and engage with the drive gear 72. Then control the servo motor 71 to open and drive the engaged upper driven gear 73 to rotate linearly forward through the drive gear 72. The upper driven gear 73 drives the threaded rod 75 to rotate forward through the first electric push rod 74. The rotating threaded rod 75 drives the vibration motor 77 on the threaded cylinder 76 to rise at a constant speed. The vibration motor 77 drives the uninflated square airbag 79 to rise through the first universal joint 78. Step 2: Since the edge of the square airbag 79 is fixed to the top platform 6, as the threaded cylinder 76 gradually rises, the square airbag 79 rises to a greater degree until it reaches the predetermined mountain shape. Then, the servo motor 71 is turned off, and the first electric push rod 74 is turned off and drives the upper gear 73 to move away from the meshing part of the drive gear 72 to the initial position. At the magnet block 10 on the raised square airbag 79 simulating the mountain scene, the plastic vegetation and rocks simulating the mountain environment are attracted by the fixed magnet. House models and plastic tree models are placed at the four corners of the unraised square airbag 79 and the top platform 6 to complete the simulation of the mountain environment and human living scene. Step 3: Next, control the vibration motor 77 to start and drive the raised square airbag 79 simulating the high mountain scene to vibrate at different frequencies through the first universal joint 78 to simulate different levels of earthquake source intensity. The top platform 6 is elastically supported by the springs 5 ​​on the four supports 4. Throughout the process, the first vibration sensor 11 in the center monitors the earthquake source in the center, and the four sets of second vibration sensors 17 on the outside monitor the aftershocks. The firmness of the plastic vegetation and rocks magnetically attached to the raised square airbag 79, as well as the firmness of the house models and plastic tree models at the four corners of the non-raised square airbag 79 and the top platform 6, can be obtained. This will give the high mountain environment and earthquake intensity under the strong earthquake in the center, as well as the earthquake intensity of the human living scene under the aftershocks in the surrounding area. Step 4: After the high-altitude environment centering seismic source experiment is completed, the reverse threaded rod 75 is controlled to drive the vibration motor 77 on the threaded cylinder 76 to move down at a constant speed. The vibration motor 77 drives the uninflated square airbag 79 to sink through the first universal joint 78 until the square airbag 79 returns to a horizontal or slightly convex state with the top platform 6, simulating the plain and hilly environment. Similarly, the centering seismic experiment is carried out in the simulated plain and hilly environment scenario. After the plain environment centering seismic source experiment is completed, the reverse threaded rod 75 is controlled to drive the vibration motor 77 on the threaded cylinder 76 to move down at a constant speed. The vibration motor 77 drives the uninflated square airbag 79 to sink through the first universal joint 78, simulating the basin and lake environment. Similarly, the centering seismic experiment is carried out in the simulated basin and lake environment scenario. Step 5: During the centering source experiment in various terrain scenarios such as high mountains, plains, hills, basins and lakes, after selecting any direction as the main source, first control the second electric push rod 86 at the main source in that direction to open and drive the differential wheel 85 to move inward and engage with the main gear 84. Then, control the servo motor 71 to open and rotate linearly through the lower driven gear 81. The lower driven gear 81 drives the main gear 84 on the four sets of driven synchronous pulleys 83 to rotate linearly through the synchronous belt on the main synchronous pulley 82 under the tension adjustment of the four sets of tensioning pulleys 12. Step 6: The main gear 84 located in the direction of the main vibration source drives the cam 87 on the second electric push rod 86 to rotate linearly through the meshed differential wheel 85. The three second electric push rods 86 in the other three directions are in the closed state. Then the main gear 84 on the synchronous pulley 83 in the corresponding three directions is in the idling state. The linearly rotating cam 87 drives the push rod 15 on the lifting cylinder 89 to move up and down reciprocally through the lifting head 88. The push rod 15, which moves up and down reciprocally, drives the top platform 6, which is the main vibration source, to shake through the second universal bracket 16. If it is necessary to strengthen the intensity of the main vibration source in this direction, the electric telescopic rod 13 in the lifting cylinder 89 in this direction is opened and the push rod 15 is driven to move up through the elastic seat 14 to increase the height stroke of the push rod 15, making the top platform 6 shake more violently. The springs 5 ​​on the four brackets 4 provide elastic support for the top platform 6. Step 7: At this point, the earthquake scenarios with different intensities in this direction are simulated, and the second vibration sensor 17 in this direction is used to monitor the intensity of the main shock source. The first vibration sensor 11 in the center and the three sets of second vibration sensors 17 on the outside are used to monitor the aftershocks. Then, the state of different terrain scenarios and human-centered scenarios under the earthquake sensation in the direction of the main shock source and the other three aftershock directions is observed. In this way, the second electric push rods 86 in the remaining three directions are controlled to open and close in sequence to simulate earthquake scenarios with different intensities in the remaining three directions. Then, the state of different terrain scenarios and human-centered scenarios under the earthquake sensation in the remaining three main shock source directions and the corresponding aftershock directions is observed to complete the lateral earthquake experiment. Step 8: During the centering and lateral source experiments in various terrain scenarios such as high mountains, plains, hills, basins and lakes, the synchronous belt on the main synchronous wheel 82 always drives the four sets of slave synchronous wheels 83 to rotate continuously, and drives the four sets of blowers 91 to generate wind pressure in the four sets of air boxes 3. The wind pressure in the four sets of air boxes 3 is then supplied unidirectionally into the pressurization tank 93 for temporary storage through the four blower nozzles 92. Step 9: Based on the hardness requirements of the square airbag 79 in various terrain scenarios such as mountains, plains, hills, basins and lakes, control the opening of the four three-way valves 95. According to the pressure difference, the wind pressure temporarily stored in the pressurization tank 93 is quantitatively processed by the quantitative sensor on the three-way valve 95 and then supplied to the square airbag 79 in different terrain scenarios through the hoses 97 on the four pressurization pipes 94. As the wind pressure continues to be filled, the square airbag 79 in the formed state expands and hardens. Step 10: Conversely, the air pressure inside the square airbag 79 is released through the four three-way valves 95 and the four pressure relief nozzles 96. The square airbag 79 contracts and softens, thus adjusting the firmness of the square airbag 79 under various terrain scenarios such as mountains, plains, hills, basins and lakes. Combined with the different firmness of the square airbag 79 under the sensation of the central main seismic source and the four-directional main seismic sources, the experiment is made closer to the real situation.

[0026] It should be noted that the specific models and specifications of the servo motor 71, the first electric push rod 74, the vibration motor 77, the second electric push rod 86, the three-way valve 95, the first vibration sensor 11, the electric telescopic rod 13, the quantitative sensor, and the second vibration sensor 17 need to be selected and determined according to the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be elaborated in detail.

[0027] The power supply circuits for the servo motor 71, the first electric push rod 74, the vibration motor 77, the second electric push rod 86, the three-way valve 95, the first vibration sensor 11, the electric telescopic rod 13, the quantitative sensor, and the second vibration sensor 17 are clear to those skilled in the art and will not be described in detail here.

[0028] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. An earthquake simulation shaking table experimental device, comprising a base frame (1), characterized in that: The base frame (1) has protective covers (2) placed vertically at each of its four corners, and a bellows (3) with air holes is placed horizontally at the bottom of the protective cover (2). The base frame (1) is also fixed with brackets (4) that are distributed alternately with the protective cover (2) and the bellows (3). In addition, springs (5) are arranged vertically on the four supports (4), and a top platform (6) is fixed on the springs (5). A simulation component for simulating mountain, plain and basin scenes is vertically arranged in the middle of the base frame (1), and a shaking component for switching the simulated vibration source of the top platform (6) is arranged on the four sets of protective covers (2). Furthermore, the simulation component includes a servo motor (71) embedded on one side of the base frame (1), and a drive gear (72) is sleeved on the output shaft of the servo motor (71). The shaking component includes a lower driven gear (81) meshing with the bottom of the drive gear (72), and a main synchronous pulley (82) fixed to the bottom of the lower driven gear (81).

2. The earthquake simulation shaking table experimental device according to claim 1, characterized in that: The simulation component also includes an upper driven gear (73) disposed above the drive gear (72), and a first electric push rod (74) that rotates with the base frame (1) is longitudinally disposed on the upper driven gear (73), and a threaded rod (75) that slides with the base frame (1) is sleeved on the outer side of the first electric push rod (74).

3. The earthquake simulation shaking table experimental device according to claim 2, characterized in that: The threaded rod (75) is threadedly connected to a threaded cylinder (76) on the outside, and a vibration motor (77) is provided on the top of the threaded cylinder (76). A first universal joint (78) is fixed on the top of the vibration motor (77), and a square airbag (79) is sleeved on the outside of the first universal joint (78) and fixed to the top platform (6).

4. The earthquake simulation shaking table experimental device according to claim 3, characterized in that: The square airbag (79) is surrounded by a magnetic block (10) for adsorbing plastic vegetation and rocks. The plastic vegetation and rocks are adsorbed and positioned by the magnetic block (10) with fixed magnets with opposite magnetic poles. A first vibration sensor (11) is provided on the top of the first universal frame (78).

5. The earthquake simulation shaking table experimental device according to claim 4, characterized in that: The swaying assembly also includes a slave synchronous pulley (83) driven by a synchronous belt on the outside of the main synchronous pulley (82), and a main gear (84) is fixed on the top of the four sets of slave synchronous pulleys (83), and a differential pulley (85) is provided on the outside of the four sets of main gears (84).

6. The earthquake simulation shaking table experimental apparatus according to claim 5, characterized in that: The four sets of differential wheels (85) are fixed with second electric push rods (86) that are rotated and matched with the guard (2). Cams (87) are sleeved on the four second electric push rods (86), and lifting heads (88) slide on the cams (87). Lifting cylinders (89) that slide and cooperate with the guard (2) are longitudinally arranged on the four lifting heads (88).

7. The earthquake simulation shaking table experimental apparatus according to claim 6, characterized in that: The outer side of the main synchronous pulley (82) has a tensioning pulley (12) that is adjusted with the tension of the synchronous belt and rotates in cooperation with the base frame (1). The four lifting cylinders (89) are equipped with electric telescopic rods (13), and spring seats (14) are fixed on the piston rods of the four electric telescopic rods (13).

8. The earthquake simulation shaking table experimental apparatus according to claim 7, characterized in that: The top of the four elastic seats (14) is vertically arranged with a top rod (15) that slides with the lifting cylinder (89), and a second universal bracket (16) that is fixed to the top platform (6) is fixed on the four top rods (15), and a second vibration sensor (17) that is used in conjunction with the first vibration sensor (11) is provided on the top of the top platform (6) near the second universal bracket (16).

9. The earthquake simulation shaking table experimental device according to claim 8, characterized in that: Warning lights are placed horizontally on the outside of the four sets of protective covers (2), and casters for displacement of the top platform (6) are fixed at the bottom of the four supports (4), and the four sets of springs (5) are distributed in an axisymmetric manner along the longitudinal axis of the top platform (6).

10. A method for earthquake simulation shaking table testing, based on the earthquake simulation shaking table testing apparatus according to any one of claims 1-9, characterized in that: Includes the following steps: Step 1: First, control the first electric push rod (74) to adjust the meshing stroke of the upper driven gear (73) and the drive gear (72) to the correct position. Then, control the servo motor (71) to drive the threaded cylinder (76) through the threaded rod (75) to adjust the three states of rising, resetting and falling. Control the square airbag (79) to form various terrain scenes such as mountains, plains, hills, basins and lakes. The vibration motor (77) will simulate earthquake sources with different degrees of vibration to complete the experimental work of different terrain scenes under the earthquake in the center of the top platform (6). Step 2: After selecting one of the four directions of the top platform (6) as the main vibration source, first control the second electric push rod (86) at the main vibration source in that direction to adjust the meshing stroke of the differential wheel (85) and the main gear (84) to the correct position. Then, the lower driven gear (81) drives the main gear (84) on the four sets of driven synchronous wheels (83) to rotate linearly through the main synchronous wheel (82) and the four sets of tensioning wheels (12). Step 3: Then, the four sets of main gears (84) drive the cams (87) on them to drive the lifting head (88) to drive the top rod (15) on the lifting cylinder (89) to move up and down repeatedly. The second universal joint (16) drives one corner of the top platform (6) as the main source of the earthquake to shake. This process is repeated to complete the experimental work of different terrain scenarios under the lateral earthquake of the top platform (6).

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