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Keywords
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Progressive collapse, Alternate path method, Nonlinear static, push-down analysis, Nonlinear dynamic analysis, Dual Systems, Buckling restrained brace, Moment resisting frame
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Abstract
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Progressive collapse is a condition where local failure of a primary structural component leads to the collapse of neighboring members and the whole structure, consequently. In this paper, the progressive collapse potential of seismically designed steel dual system with buckling restrained braces is investigated using the alternate path method, and its performance is compared with that of the conventional intermediate moment resisting frame. Static nonlinear Push-down and dynamic analyses under gravity loads specified in GSA guideline are conducted to capture the progressive collapse response of the structures due to column and adjacent BRBs removal, and their ability of absorbing the destructive effects of member loss is investigated. It was observed that, compared with the intermediate moment resisting frames, generally the dual systems with buckling restrained braces provided appropriate alternative path for redistributing the generated loads caused by member loss and the results varied more significantly depending on the variables such as location of column loss and number of stories. The results showed that, despite lower amount of steel material used in dual system and also smaller column and beam sizes in comparison to moment resisting frames, the dual system is more capable to resist the progressive collapse loads and maintain the structural overall integrity especially when the BRB elements are provided above the critical removed column.
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