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Influence of ground-motion peak velocity on non-linear dynamic response of single-degree-of-freedom system

HAO Minghui;WANG Shan;ZHANG Yushan;China Earthquake Disaster Prevention Center;  
In this paper,the influence of ground-motion peak velocity on the dynamic is studied,especially nonlinear dynamic,responses of single-degree-of-freedom(SDOF) systems,under the condition that the response spectrum and the peak displacement of the input ground motion are fixed.Firstly,by the method of superimposing narrow-band time histories in the time domain,two groups of artificial ground-motion time histories are synthesized,whose response spectra and peak displacements are same,while the peak velocity of one group is double the other.Secondly,in accordance with the requirements of the "Building Seismic Design Code ",the synthesized input ground motions are calibrated to accelerate peak values under a frequently occurred earthquake in areas with different seismic fortification intensity,then the calculation on the structural elastic-plastic response is worked out.The results show that the variation of the peak velocity of the input ground motion basically has no effect on the structural elastic response.Then,the input ground motions are calibrated to the acceleration peak of a rarely occurred earthquake in the area with corresponding seismic fortification intensity,and the maximum deformation of the elastic response under a frequently occurred earthquake is set as a yielding deformation for structural elastic-plastic analysisunder the action of the rarely occurred earthquake,then the law of the influence of input ground motion peak velocity on structural elastic-plastic response is made.The results show that the increase of peak velocity will significantly increase the elastic-plastic displacement and velocity of the long periodic structures,and the amplification effect is especially significant on displacement.This law is basically consistent with different intensity regions,and with the increase of intensity,the amplification effect of the elastic-plastic displacement and velocity response of the long periodic structures,which is caused by the increase of the peak velocity of the input ground motion,will decreased.Therefore,when the structural dynamic analysis is carried out,the influence of the variation of the variation of the peak velocity of the input ground motion on the calculation results should be considered.
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