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Buckling restrained brace

A technology of anti-buckling energy dissipation and yield limit, applied in seismic, building components, building types, etc., can solve problems such as poor low-cycle fatigue performance and fatigue fracture, and achieve improved seismic performance, strong cumulative plastic deformation capacity and hysteresis. The effect of energy dissipation capacity, excellent room temperature low cycle fatigue performance

Pending Publication Date: 2019-02-15
SHANGHAI RES INST OF MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above core steels have low yield strength, relatively stable hysteresis characteristics and full hysteresis curves, their low-cycle fatigue properties are poor, and the materials under large earthquakes can withstand a few cycles of tension-compression cyclic loading. Fatigue fracture will occur, so the anti-buckling support made of the above-mentioned core material cannot play an important role in high-intensity earthquakes and long-term vibrations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 , figure 2 and image 3 As shown, a new type of bolt-connected anti-buckling energy-dissipating support is composed of three parts: an end restraint section 1, a buckling section 2 and a casing 3; the end restraint section 1 is located at both ends of the buckling section 2, It plays the role of transmitting load, and one side of it is connected with the buckling section 2; the buckling section 2 undertakes plastic deformation and hysteretic energy dissipation; the casing 3 is fixed on the outside of the buckling section 2 by grouting and filling concrete, And there is a layer of unbonded material between the concrete and the outside of the buckling section.

[0035]The cross-sectional shape of the buckling section 2 is straight, the cross-section is narrow in the middle and wide at both ends along the axial direction, and the ratio of the cross-sectional area of ​​the middle part to the two ends is 2:1. The material of the buckling section 2 is all...

Embodiment 2

[0040] refer to Figure 4 , Figure 5 and Figure 6 , a welded joint type anti-buckling energy-dissipating support, which is composed of three parts: an end restraint section 1, a buckling section 2 and a casing 3; the end restraint section 1 is located at both ends of the buckling section 2, and one side thereof Connected to the buckling section 2; the buckling section 2 undertakes plastic deformation and hysteretic energy dissipation; the casing 3 is fixed on the outside of the buckling section 2 by grouting and filling concrete, and there is a gap between the concrete and the outside of the buckling section layer without adhesive material. In this embodiment, the casing is square.

[0041] The cross-sectional shape of the buckling section 2 is cross-shaped, and the cross-shaped cross-section is narrow in the middle and wide at both ends along the axis direction, and the ratio of the cross-sectional area of ​​the middle part to the two ends is 2:1. The cross section is o...

Embodiment 3

[0046] refer to Figure 7 and Figure 8 , a threaded joint type anti-buckling energy-dissipating support, which is composed of three parts: an end restraint section 1, a buckling section 2 and a casing 3; the end restraint section 1 is located at both ends of the buckling section 2, and one side thereof Connected to the buckling section 2; the buckling section 2 undertakes plastic deformation and hysteretic energy dissipation; the casing 3 is fixed on the outside of the buckling section 2 by grouting and filling concrete, and there is a gap between the concrete and the outside of the buckling section layer without adhesive material. In this embodiment, the sleeve is in the shape of a circular tube.

[0047] The cross-sectional shape of the buckling section 2 is circular, and the circular cross-section is narrow in the middle and wide at both ends along the axial direction, and the ratio of the cross-sectional area of ​​the middle part to the two ends is 2.5:1. The material ...

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Abstract

The invention relates to a buckling restrained brace. The buckling restrained brace comprises end part restrained sections, buckling sections and a sleeving pipe, the end part restrained sections arelocated atthe two ends of the buckling sections and play a load conveying role, one sides of the end part restrained sections are connected with the buckling sections, and the other sides of the end part restrained sections are used for connecting to a beamcomponent, a column component or a joint; the sleeving pipe is fixed to the outer sides of the buckling sections by grouting and filling concrete, and a layer of an unbonded material is between the concrete and the outer sides of the buckling sections; and buckling sections play a role of dissipating energy and the material of the buckling sections is alloy steel, the micro organization structure of the alloy steel is composed of a meta-stable stateaustenite and thermal-inducedepsilon martensite with the volume fraction less than 10%, and entering into a yield phase, and the micro organiztion of the alloy steel is subjected to reversible transition between the austenite and stress / strain-induced epsilon martensite under theactionof stretch-compression alternate loading. The buckling restrained brace can possess larger buckling bearing force and accumulated plastic energy dissipating effect, and can significantly improve the anti-seismic property of a building and realize light weight of the buckling restrained brace.

Description

technical field [0001] The invention relates to an anti-buckling energy dissipation support, which belongs to the technical field of civil engineering structures. Background technique [0002] Large-scale earthquakes and external long-term and long-period vibrations will cause great harm to high-rise buildings and structures. The use of energy-dissipating and shock-absorbing devices and technologies can effectively absorb external shock energy and minimize damage to buildings and structures. Buckling-resistant braces are a common energy-dissipating and shock-absorbing element that is widely used in civil engineering structures. Under small earthquakes, anti-buckling braces can provide additional stiffness to beam-column structures and reduce structural deformation; under large earthquakes, anti-buckling braces can yield under tension or compression, showing good hysteretic energy dissipation ability. [0003] At present, buckling-resistant braces mainly use mild steel and...

Claims

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Application Information

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IPC IPC(8): E04H9/02E04B1/98
CPCE04H9/021
Inventor 杨旗李华涂田刚徐斌
Owner SHANGHAI RES INST OF MATERIALS CO LTD
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