Basic Research on Vibration Control Building Structural System Including Uplift Mechanism

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To reduce seismic damage of buildings, some structural systems which are intentionally allowed to uplift during an earthquake have been proposed. These systems can be generally applied to buildings with large aspect ratio, most of which has only single span. And these buildings will wholly uplift around the bearing on the one side. On the other hand, we propose ‘vibration control systems including uplift mechanism', assuming that seismic damage of buildings with multi-spans can be also reduced even if they are allowed to uplift partially, not wholly. In this research, we develop a method to make buildings uplift and examine seismic performance of the proposed structural systems.The achievements of this research are summarized as follows ;(1)Energy dissipation mechanismSeismic energy dissipation mechanism of buildings allowed to uplift wholly or partially were clarified.(2)Structural method to make buildings upliftA structural method to make buildings uplift using yielding base plates was proposed. The yielding base plates are attached at each column base. The restoring force characteristics of the base plates were cleared based on the large scale-tests.(3)FEM time history response analysis methodApplicability of FEM time history response analysis method, which can analyze impact effects and non-linear behavior of base plates particularly, to buildings allowed to uplift was shown comparing analysis results with past experimental results.(4)Seismic response reduction effects of proposed structural systemsSome case studies using a time history analysis method were carried out to verify seismic performance of the proposed systems. And their energy dissipation mechanism was shown.(5)Modal analysis on buildings allowed to upliftTo understand seismic response characteristics of buildings allowed to uplift more generally, a modal analysis method was applied. Especially, effects of higher modes to dynamic behavior of them were shown.