Civil Engineering Association

Seismic design of steel structures with buckling-restrained knee braces

Analytical models and a performance-based seismic design procedure were developed for
a structure with buckling-restrained knee-braces. The hinge-connected main structural members,
such as beams and columns, were designed only for gravity loads, and the knee-braces
were designed to resist all the lateral seismic load. The cross-sectional size of knee-braces
was estimated using the equivalent damping required to be supplied to meet a given performance
objective. Parametric study was performed with design variables such as slope and
yield stress of the braces. According to the time-history analysis results of a five-story structure
with buckling-restrained knee-braces, the maximum displacement of the model structure
turned out to correspond well with the desired target displacement after it is retrofitted by
knee braces following the proposed procedure.

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asim99

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