OpenSees Modeling
buckling-restrained braces (BRB)
undamentally, BRBs are a mild steel plate (core) confined by a relatively stronger case (casing) to prevent the plate from buckling in compression. Fig. 1-a shows a schematic of a typical BRB.
The steel core is either a cruciform or a plate and the casing is generally a steel tube filled with concrete. A really small gap is left between the core plate and the confining concrete, big enough to allow the steel core to initiate buckling but not so large to let it buckle.
This gap also accommodates the change in volume of the core steel while in compression. This entire mechanism lets BRBs exhibit a balanced tension-compression behavior, opposite to a simple steel beam brace
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