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Erschienen in:
2022 | OriginalPaper | Buchkapitel
Feasibility of Strongback System in Storey Mechanism Mitigation of Steel Braced Frames
verfasst von : Lizhu Chen, Shuaikang Wang, Anastasia Athanasiou, Lucia Tirca
Erschienen in: Proceedings of the 10th International Conference on Behaviour of Steel Structures in Seismic Areas
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Abstract
Under earthquake loading, conventional braced frames are prone to storey mechanism. To mitigate this drawback, researchers have proposed to add an alternative vertical force path to redistribute member forces among floors. Likewise the dual system, the strongback acts as a vertical elastic spine and compensates for the loss of storey shear after braces of ductile system exhibited buckling. Nevertheless, the inelastic first mode and the elastic higher vibration modes excite the strongback, which could be installed interior or exterior to the braced frame. A design method for strongback braced frame is proposed and a case study consisting of a 4-storey office building in Victoria, BC, Canada, is presented. Numerical model was developed in the OpenSees environment and results from nonlinear response history analyses, expressed in terms of interstorey drift, residual drift, and floor acceleration, are presented. The hybrid system is able to mitigate the storey mechanism and enhances the building’s safety.