簡易解析モデルによるロッキング構造システムの地震応答性状と等価減衰定数の評価

日本建築学会

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  • SEISMIC RESPONSE AND ESTIMATION OF EQUIVALENT DAMPING RATIOS OF STRUCTURAL ROCKING SYSTEMS USING SIMPLIFIED MODELS

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Previous studies have suggested that rocking vibration accompanied with foundation uplift motion might reduce the seismic damage of buildings subjected to severe earthquake motions. In this paper, the seismic response of simplified analytical models of rocking frames with column-bases allowed to uplift is evaluated by numerical analyses. The results are: 1)The base shear spectra for rocking models subjected to an earthquake motion demonstrate the definite reduction of base shear as compared to the fixed-base models over a certain range of natural period; 2) The total input energy exerted to rocking models during uplift motion is reduced by the amount of the incremental potential energy; and, 3) The vertical component of earthquake motions does not much affect the horizontal responses of rocking models but increases slightly their uplift response displacement.

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