Hydraulic earthquake simulation vibration table

Abstract

The invention discloses a hydraulic earthquake simulation vibration table which comprises a vibration platform, a plurality of hydraulic actuators, a hydraulic oil pump and a conveying pipe. The actuator is composed of a horizontal excitation source horizontally connected with the vibration platform and a vertical excitation source vertically connected with the vibration platform, and the hydraulic actuator is hinged to the vibration platform through a connecting device. The hydraulic earthquake simulation vibration table is a three-direction six-degree-of-freedom simulation vibration table and is composed of two actuators in the X direction, two actuators in the Y direction and four actuators in the Z direction, and real earthquake waves can be simulated more truly so as to detect the earthquake resistance of an object.

Description

Technical Field

[0001] The invention patent relates to a test bench for simulating seismic waves to detect the seismic performance of samples. Background Art

[0002] Earthquake is one of the major disasters in nature. Due to its suddenness, destructiveness and unpredictability, earthquake disasters pose a serious threat to human life and property safety. my country is located at the junction of the Eurasian Plate Boundary Seismic Belt and the Pacific Ring of Fire, resulting in nearly 50% of the country's cities being located in the seismic activity belt with a basic fault degree of more than 7 degrees. In addition, earthquakes in this seismic activity area have the characteristics of high frequency, shallow vibration source and high intensity. Therefore, my country is one of the countries in the world prone to earthquakes. Since the current earthquake monitoring and early warning technology is still imperfect. Therefore, the study of the seismic performance of buildings is an important research direction to reduce the damage caused by earthquake disasters and protect the safety of people's lives and property. The earthquake simulation vibration table can vividly show the seismic performance of the structure under the action of seismic waves, so the earthquake simulation vibration table test method has become the most commonly used method to study the seismic resistance of buildings. The development of the vibration table provides an effective means for studying the resistance of structures to earthquakes. Summary of the invention

[0003] In view of the above, the present invention provides an earthquake simulation vibration table, which can effectively simulate the seismic waves caused by earthquakes and make judgments on the seismic performance of buildings in advance to reduce their losses.

[0004] The technical solution of the patent of the present invention is: a hydraulic earthquake simulation vibration table, including a vibration platform, and also including a placement plate, the placement plate is placed on the vibration platform, and there are uniform circular holes on the placement plate for fixing the detection model. There are 4 Z-direction hydraulic actuators at the bottom of the vibration platform, which are hinged to the vibration platform through a connecting device. The 4 Z-direction hydraulic actuators are respectively fixed to the foundation. The foundation adopts a pile foundation, and the overall foundation is filled with concrete. The foundation mass is more than 20-30 times the total weight of the table and the load. It can withstand a larger earthquake source, and the foundation quality is good, which can reduce vibration to increase its stability and reduce vibration.

[0005] The X-direction and Y-direction actuators are respectively connected to the vibration platform through connecting devices, the X-direction hydraulic actuator is fixed to the X-direction reaction wall, and the Y-direction hydraulic actuator is fixed to the Y-direction reaction wall.

[0006] Each connecting device is fixed to the vibration platform by 4 bolts, which has strong stability and will not deviate due to looseness, thus affecting the accuracy of performance. The other end of the connecting device is fixed to the piston rod of the hydraulic cylinder. The inside of the connecting device is hinged and can move within a certain small range, so the piston rod will not malfunction due to the vibration of the vibration platform.

[0007] Furthermore, the eight hydraulic actuators are powered by hydraulic oil pumps and hydraulic control systems, both of which are integrated structures, through oil pipelines. Acceleration sensors and speed sensors are installed on the vibration platform and fixed by gluing.

[0008] The patent of this invention has the following technical effects: The patent of the present invention can fix the model through multiple fixing holes on the vibration platform, which can improve the stability of the model, and allow observers to intuitively see the destructiveness of the earthquake. It can also adapt to models of various sizes, is easy to use, and has a wide range of applications.

[0009] The patent of this invention adopts a three-way six-degree-of-freedom structure, which can provide drive for the vibration platform in three directions of XYZ, and can simulate seismic waves more realistically. Compared with unidirectional or bidirectional actuators, it is more realistic and reliable, and can more accurately measure the seismic performance of the model. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 A top view of the hydraulic earthquake simulation shaking table; Figure 2 This is the left view of the hydraulic earthquake simulation shaking table; Figure 3 This is the overall side view of the hydraulic earthquake simulation shaking table; Figure 4 This is a diagram of the connection device of the hydraulic earthquake simulation shaking table; Explanation of the accompanying drawings: in the figure, 1 is a vibration platform; 2 is a connecting device; 3 is a foundation; 4 is a Y-axis actuator; 5 is a hydraulic pump source and control system; 6 is a Y-axis reaction wall; 7 is an X-axis reaction wall; 8 is an X-axis actuator; 9 is a velocity sensor; 10 is an acceleration sensor; 11 is a Z-axis actuator; and 12 is an oil pipeline. DETAILED DESCRIPTION

[0012] The following will provide a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings, and this description is only a partial embodiment of the present invention, not all embodiments.

[0013] In the description of the present invention, it is necessary to further explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0014] The invention patents a hydraulic earthquake simulation vibration table, such as Figure 1 As shown, it includes a vibration platform 1, XYZ actuators (4, 8, 11), a hydraulic pump source (5), a delivery pipe (12), a foundation (3), a reaction wall (6, 7); and a connecting device (2).

[0015] The vibration platform 1 vibrates the model through the XYZ actuators, which can simulate real seismic waves to perform seismic analysis on the model.

[0016] The hydraulic earthquake simulation vibration table is precisely controlled in motion by means of hydraulic cylinders (4, 8, 11) and their hydraulic pump sources and a hydraulic control system (5). There are two actuators for the front and rear degrees of freedom (X direction), two actuators for the left and right degrees of freedom (Y direction), and four actuators for the up and down degrees of freedom (Z direction). The eight actuators are respectively hinged to the vibration table through connecting devices (2) and can move within a certain range.

[0017] It should be noted that: through the XYZ actuators, the three-dimensional six-degree-of-freedom earthquake simulation shaking table can not only simulate the movement of longitudinal and transverse waves, but also control the force and displacement in three directions at the same time, thereby simulating complex earthquake waveforms. The transverse wave simulates the horizontal shear movement through the XY actuator, and the longitudinal wave simulates the vertical movement through the Z actuator.

[0018] Its XYZ actuators are respectively composed of a hydraulic cylinder, a hydraulic pump (5) and a delivery oil pipe (12) to form a hydraulic control system. The entire hydraulic control system adjusts the output of the hydraulic drive system through a high-precision control system to ensure that the vibration table can accurately move according to the predetermined waveform, frequency and amplitude.

[0019] Acceleration sensors (10) and displacement sensors (9) are installed on both sides of the vibration table and connected by gluing. They can measure the motion state of the table in real time and feed the data back to the control system to adjust the output of the drive system to ensure the accuracy of the vibration mode.

[0020] The overall operation mode is as follows: the model to be tested is fixed on the vibration table (1), the movement of the hydraulic cylinder is controlled by the hydraulic control system, the drivers in the XYZ directions respectively drive the vibration platform to move, the transverse wave is simulated in the XY direction, and the longitudinal wave is simulated in the Z direction. The model on the vibration platform is driven to vibrate up and down by the four Z-direction actuators (11), the vibration platform is driven to shake left and right by the X-direction actuators (8), and the vibration platform is driven to shake forward and backward by the Y-direction actuators (4), so that the building model can vibrate up and down, shake left and right, and shake forward and backward independently and simultaneously, and can be freely combined into different vibration forms to complete the earthquake simulation of the building.

[0021] When the actuator moves, the platform is driven by the connecting device (3). The connecting device is hinged inside and has a certain degree of freedom in space. It can move in a small range in different directions with the vibration platform and has high flexibility.

[0022] The vibration platform is supported by four Z-direction actuators (11), which are fixed to the foundation. The concrete foundation used in the foundation is sufficiently stable to withstand a large earthquake wave reaction force. The XY-direction actuators are similarly fixed to the reaction force and both use a concrete foundation.

[0023] Secondly, a sensor can be installed on the vibration platform to detect the required parameters of its vibration. The present invention adopts a bonding method to fix the velocity sensor (9) and the acceleration sensor (10). Different sensors can also be installed according to different needs. The operation is convenient and the use is flexible.

Claims

1. A hydraulic earthquake simulation vibration table, characterized in that: The invention comprises a vibration table (1), a plurality of hydraulic actuators and a connecting device (12), wherein the X-axis actuator (8) is hingedly connected to the vibration table (1) through the connecting device, the Y-axis actuator (4) is hingedly connected to the vibration table (1) through the connecting device, and the Z-axis actuator (11) is hingedly connected to the vibration table (1) through the connecting device. The actuators are powered by a hydraulic oil pump (5) through a delivery pipe. A displacement sensor (9) and an acceleration sensor (10) are installed on the vibration table to receive signals of the vibration state.

2. A hydraulic earthquake simulation vibration table according to claim 1, characterized in that: The earthquake simulation vibration table is placed on a foundation (3) which is a pile foundation. The Z-direction actuator (11) is fixed to the foundation.

3. A hydraulic earthquake simulation vibration table according to claim 1, characterized in that: The X-direction actuator is fixed to the X-direction reaction wall. The Y-direction actuator is fixed to the Y-direction reaction wall to support its hydraulic cylinder.

4. A hydraulic earthquake simulation vibration table according to claim 1, characterized in that: The vibration platform (1) is supported by four Z-axis actuators. A sample can be placed on the vibration platform (1) to test its resistance performance. The vibration platform (1) has a plurality of fixing holes for fixing the sample to be tested.

5. A hydraulic earthquake simulation vibration table as claimed in claim 1, characterized in that: The hydraulic oil provided by a large hydraulic oil pump source (5) drives each hydraulic actuator to move according to a specified program through a delivery pipe to simulate real seismic waves.

6. As described in claim 1, the vibration platform (1) is equipped with an acceleration sensor (10) and a velocity sensor (9) for receiving its state during the simulated earthquake process for subsequent experimental comparison.

7. As described in claims 3 and 4, the XYZ actuator is connected to the vibration platform (1) through a connecting device, and is fixed to the bolt holes on the vibration platform by bolts. Each connecting device has 4 bolts connected to the vibration platform to increase its stability and reduce unnecessary vibration.

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