Basic Study on Development of Response Controlled System with Uplift Mechanism

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To utilize the seismic-force reduction effect due to uplift to a wider range of buildings, three types of response controlled systems are investigated in this study. Those systems are(1) Systems allowed to uplift at mid-story,(2) Systems allowed to uplift with narrower span of column/support than the width, and(3) Systems with multi spans. For(1) and(2), analytical study is done using uniform shear-beam model to clarify those vibration characteristics and dynamic behaviors. Then shaking table tests are conducted to investigate the seismic responses and reduction effect by uplift motion. For(3), a self-centering structural system is proposed and seismic response analysis is carried out to investigate the multi-dimensional responses using an application example. The results show the distinctive higher-mode vibration and reduction effect due to uplift in those systems.