Novel low-residual-deformation multiple-yield-point all-steel buckling restrained braces

Abstract

The invention relates to a novel all-steel buckling constraint support with low residual deformation and multiple yield points, which is composed of a core material, a constraint plate, a filler plate and high-strength bolts. Among them, the core material is a metal core material composed of steel with a low yield point and high-strength steel, and the filler plate and the restraint plate are connected by bolts. The core material is wrapped in the filling and restraining plate to limit the in-plane and out-of-plane deformation of the core material, so as to achieve the effect of improving the deformation capacity and cumulative plastic energy dissipation capacity of the support under hysteretic loading such as earthquakes. Secondly, the unique core material design can make the core material have multiple yield points and reduce the axial residual deformation of the core material, thereby effectively reducing the residual deformation between the structural layers and facilitating the post-earthquake repair of building structures or bridge structures. In addition, the new low residual deformation multi-yield point buckling-restrained brace has the characteristics of light weight, which can reduce its own weight, thereby reducing the seismic force of the structure. At the same time, the support stiffness is small, which is beneficial to avoid excessive burden on connected nodes and adjacent components.

Description

technical field [0001] The invention relates to a new type of low residual deformation multi-yield point all-steel buckling restraint support. The invention can be widely used in the seismic design and reinforcement reconstruction of structures such as buildings and bridges. The plastic deformation energy of the core material can absorb the input of earthquakes to the structure. energy of. The interstory residual deformation after the earthquake is very important to the repairability of the structure. The patent of the invention can effectively reduce the residual interstory deformation of the structure after the earthquake while dissipating the seismic energy, thereby not only protecting the safety of the main structure, but also greatly Improve the post-earthquake repairability of structures. Background technique [0002] Most of the restraining members of the existing buckling-restrained braces are steel pipes filled with mortar. This type of brace is often unstable due ...

AI Technical Summary

Problems solved by technology

[0002] Most of the restraining members of the existing buckling-restrained braces are steel pipes filled with mortar. This type of brace is often unstable due to the difficulty in controlling the pouring quality of the mortar, and its self-heavy weight is not conducive to engineering construction and installation, and will cause the structure to be too large additional earthquake force

In addition, most of the existing buckling-constrained braces use mild steel as the core material, which produces large axial plastic deformation through its axial force to absorb the energy input to the structure after the earthquake, but the axial residual deformation of the core material after the earthquake will cause The residual deformation between the structural layers is too large, which is not conducive to the post-earthquake repair of the structure

The existing research results show that the structure can still be repaired when the residual deformation between the layers of the structure is less than 0.5%, but the existing buckling restraint braces will cause a large residual deformation between the layers after the earthquake, which cannot meet the needs of building structures and bridges in high-intensity areas. Requirements for post-earthquake repairability of structures

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