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Buckling restrained brace with tension and compression function and design method thereof

A technology of buckling restraint and design method, applied in building types, buildings, building components, etc., can solve the problems of small displacement travel of mini buckling restraint supports, inapplicable seismic isolation system, and no self-resetting ability, etc., so as to increase structural consumption. Ability, easy production and installation, cost reduction effect

Pending Publication Date: 2020-04-24
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the mini buckling-restrained bracing uses soft steel rods as energy-dissipating core members, it has no self-resetting ability. Once residual deformation occurs after a strong earthquake, it needs to be replaced
In addition, due to the large displacement requirements of the seismic isolation system, the displacement stroke of the mini buckling-restrained brace is small, so it is not suitable for the seismic isolation system

Method used

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  • Buckling restrained brace with tension and compression function and design method thereof
  • Buckling restrained brace with tension and compression function and design method thereof
  • Buckling restrained brace with tension and compression function and design method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Embodiment 1. Design method of SMA buckling-restrained brace with tension and compression functions

[0041] The design method of the SMA buckling restraint support with tension and compression function of the present invention comprises the following steps:

[0042] Step 1. Determine the required displacement stroke of the SMA rod according to the span size of the bridge and the level of ground motion, such as determining the displacement stroke of the SMA rod to be 5cm according to actual needs;

[0043] Step 2. Determine the maximum strain and maximum stress according to the properties of the SMA rod material. In this embodiment, the maximum strain and maximum stress are determined to be 5% and 600MPa respectively;

[0044] Step 3, determine the length of the required SMA rod according to the determined SMA rod displacement stroke and maximum strain; the length of the SMA rod is: 5÷5%=100cm;

[0045] Step 4: Select the diameter of the SMA rod, and determine the conn...

Embodiment 2

[0054] Embodiment 2. An SMA Buckling Constrained Support with Tension and Compression Functions

[0055] The buckling restraint support in this embodiment includes an SMA rod 1, a buckling restraint member sleeved outside the SMA rod, and a filling member filled between the SMA rod and the buckling restraint member, wherein:

[0056] The length of the SMA rod is 100cm, and the diameter is 20mm; it includes a head, a middle part and a tail, and the diameter of the head and the tail is larger than the diameter of the middle part; the head and the tail of the SMA rod are provided with connecting parts for connection , in this embodiment, the connecting part is a thread provided at the head and tail of the SMA rod, which can be connected with other structures through the thread.

[0057] Buckling constraint member, in the present embodiment, the buckling constraint component is preferably a restraint steel pipe 2, the restraint steel pipe is concentrically arranged with the SMA ro...

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Abstract

The invention discloses a buckling restrained brace with a tension and compression function and a design method thereof. The buckling restrained brace comprises an SMA rod, a buckling restrained member and a filling member. The design method comprises the following steps of determining a required SMA rod displacement stroke; determining a maximum strain and a maximum stress; determining a length of the SMA rod; determining a contact coefficient gamma between the SMA rod and the buckling restrained member rigidity; determining a minimum bending stiffness; and determining the bending stiffness of the buckling restrained member and the filling member. According to the buckling restrained brace, energy dissipation and self-resetting functions are realized by utilizing the SMA rod, and bucklingof the core SMA rod is restrained by utilizing the buckling restrained member, so that the tensile energy dissipation capability and the compression energy dissipation capacity of the SMA rod are fully utilized, and the construction cost of the structure is lower; and meanwhile, the length of the buckling restrained brace is large, which can adapt to the large displacement requirement of a seismic isolation system, the structure energy consumption capability is favorably increased, the excessive displacement is limited, the structure can automatically restore deformation after an earthquake,and the interruption time of the structure is reduced or even eliminated.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a buckling-constrained support with tension and compression functions and a design method thereof. Background technique [0002] Buildings will undergo large residual deformation under strong earthquakes, which will seriously affect the continued use of the structure. In view of the above problems, adding buckling restraint supports to the structure can effectively eliminate or reduce structural and non-structural earthquake damage and improve The safety of buildings and their internal facilities and personnel during earthquakes increases the ability of buildings to continue to be used after earthquakes. [0003] Research at home and abroad shows that the superelastic SMA rod limiter has a good limit effect in the structure, but generally uses the tensile performance of the alloy rod, because the memory alloy rod will buckle when it is compressed, and the en...

Claims

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Application Information

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IPC IPC(8): E04B1/98E04H9/02
CPCE04B1/98E04H9/02Y02T90/00
Inventor 曹飒飒纪泓言
Owner GUANGZHOU UNIVERSITY
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