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Characteristic Analysis for Seismic Ground Response of Soft Soils in Shanghai

HUANG Yu,YE Wei-min,TANG Yi-qun,CHEN Tian-ling(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,P.R.China)  
From both macro-data of recent macro earthquake damage surveys and observational records of strong motions,it has been proved that the ground conditions affect not only the peak ground acceleration(PGA) and spectral distribution but also the seismic response and damage mechanism of various kinds of engineering structures.The Quaternary deposits in Shanghai are horizontal soil layers with bedrock depth up to 300 m or so and shallow soft soils of littoral and fenny facies.Therefore,the soil deposits of Shanghai are deep and soft and have important influences upon seismic ground response of soil layers.Based on the equivalent linear approach for one-dimensional seismic ground response in frequency domain, a seismic analysis model is developed to describe the characters of deep and soft soil deposits in Shanghai.Then the seismic ground response of Shanghai soils,which is subjected to El Centro base excitations,is studied on acceleration amplification and spectral characteristics particularly.The research result shows that ground acceleration will be amplified when PGA equals 0.1 g,e.g.the seismic fortification intensity of 7.The soil deposit filters out a significant portion of the high frequency content of the bedrock acceleration and amplify the portion of the low frequency content.Spectral predominant period of the ground motion also has a tendency moving to the long-period direction.
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