Seismic performance of code-compliant Japanese buildings
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Japanese seismic design codes and guidelines permit more than one type of lateral-force-resisting system (e.g., braced frames, moment frames, shear walls) to be used in an earthquake-resisting framing system. Such framing systems are termed herein as hybrid framing systems. Multiple lateral-force-resisting systems in series, herein termed hybrid systems, have been constructed in Japan but have received limited attention from the academic community. In such systems, flexible framing is typically constructed atop stiff framing. The expected performance of such systems for the damage- and safety-limit earthquake shaking is unknown either in absolute terms or by comparison with framing systems composed of just one type of lateral-force-resisting system. The data and results presented in this thesis serve to partly fill that gap in our knowledge. Three types of lateral force-resisting systems are studied, namely, buckling restrained braced frames, steel moment resisting frames and reinforced concrete shear walls. Three building heights are considered, three, five and nine stories, to provide a robust dataset. The framing systems were designed for a site in Kobe, Japan and assessed by nonlinear response-history analysis.