BUCKLING RESTRAINED BRACES FOR VIBRATION CONTROL OF BUILDING STRUCTURE

Abstract

This paper presents the study of Buckling Restrained Braces (BRB), its analysis, design, modeling and its application in steel building frame. A brief review of work done on BRB is presented and nonlinear time history analysis of 5-story 2D frame is carried using software, SAP 2000 under El Centro earthquake. The response parameters used to evaluate structural performance are natural time period, story displacement, interstory drift, story shear and axial forces. The parameters, length and area of yielding core for modeling the correct behavior BRB are evaluated. Five different types of BRB configuration are studied. It is observed that BRB can be modeled by keeping the area of central core equal to or less than half of end offset area and length of yielding central core equal to 1/3 of total length of brace. Based on the study, new brace configuration is proposed which controls joint displacement over the unbraced and BRB configurations studied.