確定大跨連續(xù)剛構(gòu)橋地震動輸入時程方法比較
[Abstract]:Taking the site of a large span continuous steel bridge in Shanghai as an example, this paper discusses the influence of dynamic pressure on seismic response of soil layer in valley site. By generating time history of seismic response spectrum of building structure, one dimension is adopted. The input time history of ground motion is calculated by two-dimensional model. It can be seen from the comparison that considering the dynamic water pressure will greatly reduce the vertical seismic response of the site, but the dynamic water pressure has little effect on the horizontal seismic response. The time history generated by the response spectrum method is different from that obtained by the one-dimensional model and the two-dimensional model which takes into account the site topography change. The outstanding period of the time-history response spectrum calculated by the two-dimensional model exceeds the plateau section of the gauge response spectrum. Finally, the influence range of river valley site on surrounding site is discussed. The results show that the influence range of river water and river valley on the horizontal direction of surrounding site is 5 times depth of soil layer outside the river valley or 140 times depth of river valley. The effect of the valley should be taken into account in all buildings within this area.
【作者單位】: 同濟大學土木工程防災(zāi)國家重點實驗室;井岡山大學建筑工程學院;
【基金】:國家自然科學基金資助(No.90915011)
【分類號】:U442.55
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