STABILITY OF BUCKLING RESTRAINED BRACES USING DOUBLE WEB H-SHAPED BEAM AND PIN-ENDED TUBE-IN-TUBE BRACES

Abstract

One of the key limits of buckling-restrained braces (BRBs) is overall flexural buckling caused by connection failure, and they are required to exhibit stable hysteresis under cyclic axial loading with initial out-of-plane drifts simulating the bi-directional effects of a ground motion. In this paper, a series of cyclic loading tests with initial out-of-plane drifts for double web H type BRB and pin-ended tube-in-tube BRB are carried out, and the stability performance including various connection conditions and initial out-of-plane drifts are researched. These results are compared with the stability evaluation equations proposed by the authors, and the validity and accuracy of these equations are discussed.