Abstract
Buckling-restrained braces (BRBs) have been proven to be excellent seismic-resistant members in the past few decades. In this study, an innovative type of BRB, namely triple-truss-latticed buckling-restrained brace (TTL-BRB), is proposed to accommodate the high hysteretic performance requirements. The TTL-BRB comprises three separated steel tubes as cores and a triple-truss-latticed member as the restraining system. Cyclic experiments were conducted on two TTL-BRB specimens to investigate their hysteretic performance, such as hysteretic curves, skeleton curves, equivalent viscous damping ratio, and strain distribution. The test results revealed that both specimens exhibit plump hysteretic curves and stable load-carrying responses under cyclic loads, indicating that the composition of TTL-BRB enables it to achieve an excellent energy-dissipation capacity. Furthermore, a FE model considering geometric and material nonlinearities was developed, which accurately predicted the hysteretic performance of specimens in experiments. Moreover, a parametric study was performed to investigate the effect of restraining ratios on the failure modes of TTL-BRBs. Through the 72 FE model results, the restraining ratio requirements for global and local buckling designs in the statistical sense were given, providing valuable design references for engineering applications of the TTL-BRBs.
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