入力低減型支持機構を有する大スパンドーム構造物の地震応答性状 : 下部構造の不均質性が応答に与える影響

概要

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The present paper discusses the dynamic responses of a reticular dome which is installed hysteresis dampers between the dome and its substructure. The emphasis is put on the effects of the rigidity and mass distribution of the substructure, being deemed to give much influences on the response of the dome. The investigation based on the earthquake response analysis reveals the following four results. The first is that, along with the increment of rigidities and masses of the substructure, the response of the substructure grows with slight increase of dome response. The second is that the non -uniformness of the mass distribution within the substructure stimulates oval deformations to the substructure, followed by an increase of axial forces and bending moments of the ring girders of the substructure, but, within acceptable limit for design again by applying hysteresis dampers to the substructure itself. The third is that in spite of the large mass and large rigidity of the substructure and irrespective of the non - uniformness of mass distribution the dome response can be much reduced by means of the hysteresis dampers and the final result is that the present structural system can lead domes with such devices to be bearable against severe earthquake motions.
2000-06-30