The Limited Member Analysis Of Entire Proceeding Of Energy Dissipation Of Buckling Restrained Brace (BRB)

This paper firstly introduces the study actualities about the dissipation brace and theconfined concrete, and on the basis of the review, puts forward the aims and significanceof the studies of the buckling restrained brace consisting of the core steel member, theunbinding concrete and the steel tube. The paper simulates the work process of bucklingrestrained brace under monotony loading with the analysis software of ANSYS, on thebasis of the experimental studies of Taiwan's scholars. In this model, it adopts contactelement between the core steel member and concrete, and entirely glues between concreteand steel tube. By a series of calculations, we entirely realize the work process andmechanism of core steel member,unbinding concrete and binding steel tube, meanwhile,qualitatively analyze how to determine the area of concrete in order to satisfy thedissipation capability of the buckling restrained brace, and afford theory foundation forresisting seismic design. The results demonstrated:1. While pressing the core steel member without confined by concrete, the sectionstrain distributes very uniformity before and after yield; But the section stress of core steelmember in buckling restrained brace distributes uniformity before yield, and distributesasymmetry after yield. Strain increases in the ends of brace.2. The concrete strength exerts little influence on the dissipation capability ofbuckling restrained brace.3. The concrete size controls the dissipation capability of buckling restrained brace.4. To satisfy the dissipation capability of buckling restrained brace, we should chooseconcrete strength between c35 and c45, concrete size between 20 and 25 mm.Innovation is the limited member analysis of entire proceeding of energydissipation of BRB under monotony loading for the first time, and establishes the limitedmember model of energy dissipation of BRB.