Design Method of Core-Separated Assembled Buckling Restrained Braces Confined by Two Lightweight Concrete-Infilled Tubes

This paper introduces a novel type of buckling restrained braces (BRBs) called core-separated assembled BRBs (CSA-BRBs). These are comprised two single that confined by lightweight concrete-infilled tubes, which longitudinally connected continuous webs. The CSA-BRBs utilize materials more efficiently increasing the height webs to create large inner cavity, leading an economical design. predicts threshold restraint ratio approximately. is achieved assuming maximum moment resulting from applied loads at mid-height less than moment-bearing resistance conducted according outermost fiber external restraining section reading yielding. Elastic-plastic numerical analysis using FEM with beam elements for subjected both monotonic and cyclic axial loads. load resistance, hysteretic performance, failure mechanism investigated varying their ratios. It recommended under compression used as bearing axially compressive-tensile energy-dissipation type. method provides complete design CSA-BRBs.