Tri-axial motion decoupling periodic structure for shaking table container

Patent metadata

Field	Value
Publication number	US-11226260-B2
Application number	US-201816333789-A
Country	US
Kind code	B2
Filing date	Feb 11, 2018
Priority date	Feb 28, 2017
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

Provided is a three-directional motion decoupling periodic structure for a shaking table container. The periodic structure is formed by sequentially superimposing n periodic structure units, wherein each of the periodic structure units is formed by sequentially superimposing a first side-confining layer, a planar decoupling layer, a second side-confining layer and an elastic layer, wherein n is a positive integer greater than or equal to 2; the cross-sectional shapes of the first side-confining layer, the elastic layer, the second side-confining layer and the planar decoupling layer are the same; and the periodic structure is used for implementing three-directional motion decoupling in the operating condition of ground shaking. Further provided is a three-directional motion decoupling container for shaking table test, which is formed by combining the periodic structure, a container base plate and a position-limiting protection door-type frame (3). The container, which is light in weight and high in strength, is applicable to the shaking table tests at hypergravity and normal gravity. Multiple measures are taken to ensure the motion synchronization between the container and tested soil, the non-interference of the motions of the container and the tested soil in the three directions of X, Y and Z, no extra acting force being exerted on the tested soil by the container, and the avoidance of a boundary effect as much as possible, so as to fully realize the three-directional decoupling and reconstitute original site characteristics.

First claim

What is claimed is:

1. A tri-axial motion decoupling periodic structure for a shaking table container, comprising: n periodic structure units sequentially superimposed together, wherein n is a positive integer greater than or equal to 2; wherein the periodic structure unit comprises a first side-confining layer, a planar decoupling layer, a second side-confining layer, and an elastic layer sequentially stacked together; wherein the cross-sectional shapes of the first side-confining layer, the elastic layer, the second side-confining layer, and the planar decoupling layer are the same;
wherein the planar decoupling layer comprises a plurality of symmetrically distributed decoupling units, the decoupling unit comprising a decoupling component, lubricating grease and a circular groove, wherein the circular groove is configured to allow a free motion of the decoupling unit and to limit maximum horizontal displacements of the decoupling unit; wherein the decoupling component and lubricating grease are configured to realize a synchronous motion between the container and a test soil, and the decoupling units are configured to realize non-interference between the periodic structure unit's horizontal motions; wherein the plurality of symmetrically distributed decoupling units is configured to implement horizontal vibration decoupling;
wherein the planar decoupling layer connects the first side-confining layer and the second side-confining layer, on which there are a plurality of the circular grooves with symmetrical distributions; and
wherein the elastic layer is used to change the vertical stiffness of the container and to realize a synchronous vertical motion between the container and the test soil.

2. The tri-axial motion decoupling periodic structure of claim 1 , wherein the periodic structure is configured to realize the tri-axial motion decoupling of the container of a centrifuge shaking table.

3. The tri-axial motion decoupling periodic structure of claim 2 , wherein a centrifugal acceleration factor N of the shaking table is greater than or equal to 20.

4. The tri-axial motion decoupling periodic structure of claim 1 , wherein the material density of the side-confining layer is less than or equal to 7.85 g/cm 3 , and the elastic modulus is greater than or equal to 40 kN/mm 2 ; the material of the side-confining layer is aluminum alloy.

5. The tri-axial motion decoupling periodic structure of claim 1 , wherein a shape of the said side-confining layer is circular or regular polygon; the number of regular polygon's edges is greater than or equal to 2m, m is a positive integer and m is greater than or equal to 4.

6. The tri-axial motion decoupling periodic structure of claim 1 , wherein the said side-confining layer is a metal ring.

7. The tri-axial motion decoupling periodic structure of claim 1 , wherein a strain of the periodic structure is equal to a strain of the test soil and satisfies the following formula:

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Assignees

• Univ Zhejiang

Inventors

• Zhou Yanguo
• Xia Peng
• Chen Yunmin
• Ling Daosheng
• Huang Bo
• Jiang Jianqun

Classifications

• G01M7/06 Primary

  Multidirectional test stands · CPC title