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Underwater multi-point earthquake input shear box capable of changing rigidity along height direction

A technology of height direction and shear box, which is applied in the direction of hydraulic model, foundation structure test, machine/structural component test, etc., can solve the problem of reducing shear stiffness, affecting test accuracy, and stiffness of soil and shear box Ratio reduction and other issues, to achieve relatively independent movement, improve test accuracy, and reduce the effect of error

Pending Publication Date: 2022-01-11
TIANJIN UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

For the underwater shaking table test, the water level can be set freely, the shear stiffness of the saturated soil below the free water surface will decrease, and the stiffness ratio of the soil to the shear box will decrease accordingly. Generate reflected waves, affecting the accuracy of the test

Method used

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  • Underwater multi-point earthquake input shear box capable of changing rigidity along height direction
  • Underwater multi-point earthquake input shear box capable of changing rigidity along height direction
  • Underwater multi-point earthquake input shear box capable of changing rigidity along height direction

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Embodiment Construction

[0022] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0023] see Figure 1 to Figure 7 , an underwater multi-point seismic input shear box whose stiffness can be changed along the height direction. Different ground motions can be input, and the seismic waves at each point can propagate through the soil medium to achieve the effect of mutual interference of seismic waves, and better simulate the phenomenon that different parts of the long-term structure receive inconsistent excitations during earthquakes.

[0024] Each box section is provided with two side plates perpendicular to the end plates and a base 1 vertically fixed to the side plates.

[0025] The side panels include an inner panel 3-1 and an outer panel 3-2. The inner panel 3-1 is composed of multilayer grid strips 3-1-1 stacked up and...

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Abstract

The invention discloses an underwater multi-point earthquake input shear box capable of changing rigidity along the height direction, which adopts an inner and outer double-layer combined and multi-section connecting structure, end plates are arranged at two ends, each box section is provided with a side plate and a base, the side plate comprises an inner side plate and an outer side plate, the inner side plate is composed of a plurality of layers of grid plates which are stacked vertically at intervals, every two adjacent layers of grid plates are connected through a movable structure, the end plates comprise the inner end plate and the outer end plate, and springs are arranged between the grid plates of the outer side plate and the inner side plate and between the grid plates of the outer end plate and the inner end plate. A bearing connecting plate for connecting the bases together and a rubber film for connecting the two adjacent inner side plates together are arranged between the two adjacent box sections, the bearing connecting plate is lapped on the two adjacent bases, one end of the bearing connecting plate is fixed, and the other end of the bearing connecting plate is movable. According to the invention, seismic waves input at multiple points can be mutually propagated through a soil medium, the rigidity of the shear box can be conveniently changed along the height direction, and the test precision is improved.

Description

technical field [0001] The invention belongs to the technical field of civil engineering and water conservancy engineering, in particular to an underwater multi-point seismic input shear box whose stiffness can be changed along the height direction. Background technique [0002] Shaking table test is an important method to study the dynamic interaction between soil and structure under earthquake load. Compared with in-situ test and centrifuge test, it has the characteristics of low test cost and short period, and can well reproduce the seismic process and Various artificial seismic waves are thus widely used. In the test, a finite size soil box is used instead of the actual semi-infinite foundation soil. In order to reduce the boundary effect of the soil box, a layered shear soil box made of several steel frames is often used for the test. [0003] In various tests, shaking table tests with non-uniform excitation are often involved. At this time, at least two shaking tables...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02G01M7/06E02D33/00E02B1/02
CPCG01M7/025G01M7/06E02D33/00E02B1/02
Inventor 柳国环陈欣宇
Owner TIANJIN UNIV
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