ANALYSIS OF LOCAL SITE EFFECTS ON SEISMIC RESPONSE OF FRAME STRUCTURES SUPPORTED BY FOUNDATIONS AT DIFFERENT ELEVATIONS

Yangyang Tang, Yingmin Li, Zong-ming Huang, Liping Liu, Yishun Ding, Hui Zhu
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Abstract

Frame structures supported by foundations with different elevations (such as a structure on the slope) undergo different ground motions because of the local site effect. Seismic response of the structure under non-uniform excitation of ground motion is different from that under uniform excitation on upper embedding end or lower embedding end. Sites with the same height difference and different soil conditions were set up in this paper to subject them to ground motions related to different positions and the seismic response of structures built on the sites under uniform and non-uniform strong seismic excitation were compared. The results show that the predominant period and amplitude of ground motions on upper embedding end and lower embedding end are different and affected by soil conditions. The extent and law of amplification of shear force, displacement and storey drift of structures under non-uniform excitation differ from those under uniform excitation when soil changes from soft to medium-hard soil. In addition, the position and degree of plastic hinges change under non-uniform excitation compared to uniform excitation. The uniform excitation using the ground motion on the upper embedding end is not always safe for the frame structure supported by foundations at different elevations.
不同标高基础支撑框架结构地震反应的局部场地效应分析
不同高程基础支撑的框架结构(如斜坡上的结构),由于局部场地效应,会产生不同的地震动。非均匀地震动作用下结构的地震反应与上埋端均匀地震动作用下结构的地震反应不同。本文设置了相同高差和不同土壤条件的场地,对其进行与不同位置有关的地震动,比较了场地上建筑结构在均匀和非均匀强震激励下的地震反应。结果表明:上埋端和下埋端地震动的主导周期和振幅不同,且受土壤条件的影响;软土向中硬土转变时,非均匀激励下结构剪力、位移和层间位移的放大程度和规律与均匀激励下不同。此外,与均匀激励相比,非均匀激励下塑性铰的位置和程度发生了变化。对于不同标高基础支撑的框架结构,地面运动对上埋设端的均匀激励并不总是安全的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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