Investigation on the Probability Response Spectrum of Seismic for Soft Soil Sites
Bian Rong-yan · Journal of Qingdao Technological University · 2012
Currently,the average value of seismic response spectrum is taken as the fortification level,however,the probability of earthquake fortification level can not be clearly defined.The 368 seismic records of the soft soil site are analysed in the paper and the three-dimensional distributive probability plots of periods,variety intervals and distributive probability are established.It is shown that the ratio between every seismic response spectrum value and the average value are not around 1.So,the mean response spectrum can't reflect the unified fortification level.Thus,the three-dimensional cumulative probability plots are established and the response spectrum with different probability reliability can be obtained.Finally,the spectrum's expression between the provided fortification level and period is fitted.