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Earthquakes and Structures
  Volume 9, Number 6, December 2015 , pages 1251-1272

Towards achieving the desired seismic performance for hybrid coupled structural walls
Chung-Chan Hung and Wei-Ting Lu

    It is widely recognized that the preferred yielding mechanism for a hybrid coupled wall structure is that all coupling beams over the height of the structure yield in shear prior to formation of plastic hinges in structural walls. The objective of the study is to provide feasible approaches that are able to promote the preferred seismic performance of hybrid coupled walls. A new design methodology is suggested for this purpose. The coupling ratio, which represents the contribution of coupling beams to the resistance of system overturning moment, is employed as a fundamental design parameter. A series of nonlinear time history analyses on various representative hybrid coupled walls are carried out to examine the adequacy of the design methodology. While the proposed design method is shown to be able to facilitate the desired yielding mechanism in hybrid coupled walls, it is also able to reduce the adverse effects caused by the current design guidelines on the structural design and performance. Furthermore, the analysis results reveal that the state-of-the-art coupled wall design guidelines could produce a coupled wall structure failing to adequately exhaust the energy dissipation capacity of coupling beams before walls yield.
Key Words
    coupled structural walls; inelastic behavior; seismic performance; yielding mechanism; structural design
Department of Civil Engineering, National Cheng Kung University, 1, University Rd, Tainan, Taiwan

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