Reduction of the seismic performance of steel braced frames due to irregular brace over-strength distributions - D7

The influence of brace over-strength distributions on the seismic motion are studied through gradient methods based on sensitivity computation. A range of variation of the brace over-strength is defined and the brace over- strength patterns that are the most unfavorable for each response parameter are identified. Then, the relationship between the brace over-strength used in the seismic design and the maximum seismic performance reduction is obtained. Results for a case study considering a realistic buckling-restrained braced frame are presented and discussed showing the practical use of the developed sensitivity-based methodology.

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