単層ラチスドームを対象とした地震荷重と耐震性能評価法の提案

概要

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The present research proposes statically equivalent seismic loads and a method to evaluate seismic performance which can be applied to design of single layer reticular domes. The dome is supported by pins at its circular periphery. First, the responses of accelerations and axial forces are evaluated by linear elastic response analysis for the serviceability limit level, and based on the results the magnitudes and distributions of the seismic loads to the dome surface are proposed for their effect of the dynamic responses. Second the accuracy of this proposed seismic loads are investigated by comparing the axial forces of members under the seismic loads with those obtained by linear elastic response analysis using many simulated design earthquake motions. Third, the collapse mechanism is discussed based on pushover analysis using the proposed seismic loads but with increased magnitudes for various seismic intensities, followed by comparison of the results with those of elastic-plastic dynamic buckling analysis for severe earthquake motions. Finally, the dynamic ductility indexes of the domes are calculated and an effective evaluation method of their seismic performance of the domes is proposed.
日本建築学会の論文