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Core energy dissipation structure with enhanced ductility and buckling-restrained energy dissipation support

An anti-buckling energy-dissipating and core technology, which is applied in the direction of earthquake resistance, building components, building types, etc., can solve the problem of weakening the energy-dissipating effect of anti-buckling energy-dissipating supports, limited protection, and the degree of work hardening of Fe-Mn-Si alloys Advanced problems, to achieve the effect of good ductility and cumulative plastic deformation capacity

Active Publication Date: 2022-04-01
SHANGHAI RES INST OF MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the anti-buckling energy-dissipating brace made of Fe-Mn-Si alloy steel has limited protection for the main structure of the building.
In addition, the work hardening degree of Fe-Mn-Si alloy is relatively high in a single cycle of deformation, which will also weaken the energy dissipation effect of the anti-buckling energy dissipation support

Method used

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  • Core energy dissipation structure with enhanced ductility and buckling-restrained energy dissipation support
  • Core energy dissipation structure with enhanced ductility and buckling-restrained energy dissipation support
  • Core energy dissipation structure with enhanced ductility and buckling-restrained energy dissipation support

Examples

Experimental program
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Effect test

Embodiment 1

[0064] A buckling-resistant energy-dissipating brace with enhanced ductility, consisting of a core energy-dissipating structure and peripheral constraining members.

[0065] The cross-section of the core energy-dissipating structure has a cross-shaped axisymmetric geometry, and its symmetry axis is the axial direction of the energy-dissipating support. The cross-section is narrow in the middle and wide at both ends along the axial direction. like figure 2 and image 3 As shown, the core energy-dissipating structure is composed of one austenitic steel plate 2 and two ferritic steel plates 1, the austenitic steel plate 2 and the ferritic steel plate 1 have the same longitudinal length; the two ferrite steel plates Steel plates 1 with ferritic structure are respectively placed above and below steel plate 2 with austenitic structure, taking the longitudinal centerline of steel plate 2 with austenitic structure as the axis of symmetry; Closely connected by welding, the weld 3 is...

Embodiment 2

[0078] A buckling-resistant energy-dissipating brace with enhanced ductility, consisting of a core energy-dissipating structure and peripheral constraining members.

[0079] The geometric shape and connection method of the core energy dissipation structure of the buckling-resistant energy-dissipating brace described in this embodiment are exactly the same as those of the core energy-dissipating structure of the buckling-resistant energy-dissipating brace described in Embodiment 1.

[0080] In this embodiment, the chemical composition and mass percentages of the austenitic steel plate forming the core energy dissipation structure are: 29.4% Mn, 4.3% Si, 1.4% Al, 0.049% C, 0.009% P, 0.008% S, 0.005% N, the rest is Fe and unavoidable impurity elements. The average austenite grain size of the austenitic structure steel plate is 76 μm. The yield strength of the austenitic steel plate is 304 MPa, and the elongation at break is 52%. The microstructure of the austenitic structure st...

Embodiment 3

[0087] A buckling-resistant energy-dissipating brace with enhanced ductility, consisting of a core energy-dissipating structure and peripheral constraining members.

[0088] The cross-section of the core energy-dissipating structure has a cross-shaped axisymmetric geometry, and its symmetry axis is the axial direction of the energy-dissipating support. The cross-section is narrow in the middle and wide at both ends along the axial direction. Specifically, the core energy-dissipating structure is composed of one austenitic steel plate and two ferritic steel plates. The lengths of the austenitic steel plate and the ferritic steel plate are the same in the longitudinal direction; and connect as figure 2 and image 3 shown.

[0089] The geometric shape of the austenitic steel plate forming the core energy-dissipating structure is as follows: Figure 4 shown. The total length of the austenitic steel plate L=2000mm; the length L of the central part of the steel plate 0 =1430mm...

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Abstract

The invention relates to a core energy dissipation structure with enhanced ductility and a buckling-restrained brace, the buckling-restrained brace comprises the core energy dissipation structure and a peripheral constraint component, and the core energy dissipation structure at least comprises an austenite structure steel plate and a ferritic structure steel plate; and the ferritic structure steel plate must only be adjacent to the austenitic structure steel plate and is connected with the austenitic structure steel plate in a welding manner. The microstructure of the steel plate with the austenitic structure is mainly metastable austenite, during periodic alternate stretching-compression plastic deformation, reversible phase change between the austenite and strain-induced epsilon martensite occurs in the steel plate with the austenitic structure, the yield strength of the steel plate with the austenitic structure is not smaller than 220 MPa, the elongation at break is not smaller than 40%, and the elongation at break is not smaller than 40%. The yield strength of the ferritic structure steel plate ranges from 180 MPa to 400 MPa, the elongation at break is not smaller than 15%, and the yield strength of the austenite structure steel plate is 0.65 times or above that of the ferritic structure steel plate. The buckling-restrained energy dissipation support has good ductility and accumulated plastic deformation capacity.

Description

technical field [0001] The invention belongs to the technical field of construction engineering structures, and relates to a core energy-dissipating structure with enhanced ductility and an anti-buckling energy-dissipating support. Background technique [0002] Both high-intensity earthquakes and long-lasting external 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 energy-dissipating brace is a common axial energy-dissipating shock-absorbing element, which is widely used in civil engineering structures. Under small earthquakes, the anti-buckling energy-dissipating brace can provide additional stiffness to the beam-column structure and reduce structural deformation; under larger vibrations, the anti-buckling energy-dissipating brace can yield in both tension and comp...

Claims

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Application Information

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IPC IPC(8): E04B1/98E04H9/02
CPCY02E30/30
Inventor 杨旗涂田刚丁孙玮杨凯王敏洪彦昆徐斌
Owner SHANGHAI RES INST OF MATERIALS CO LTD
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