Local Buckling Restraint Condition for Core Plates in Buckling Restrained Braces

Abstract eng:
Buckling Restrained Braces (BRBs) are commonly used as ductile bracing elements in seismic zones. A key limit state governing the BRB behavior is overall flexural buckling. However, when the wall thickness of the steel tube restrainer is relatively small compared to the cross section area of the core plate, the restraint conditions against the local buckling of the core plate can be critical for the stability and strength of the BRB. In this study, cyclic loading tests and numerical analyses on BRBs are carried out using various tube restrainer configurations, and local buckling restraint conditions are discussed using these results.

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