Effect of Site Condition on Input Energy Spectra of Strong Ground Motion
The site condition has great effect on characteristics of strong ground motions during earthquakes, and the most important effect is that the components of different frequency could be amplified to some extent by soil site. To analyze the effect of site conditions, especially to estimate the amplification effect of soil site conditions, the input energy spectra of strong ground motions at different sites including bed rock, very dense soil and stiff soil are calculated and the attenuation law is obtained by using nonlinear regression method, then the energy spectra ratios of soil site to rock site for a given magnitude and distance are computed and analyzed. The results show that the site has significant effect on input energy spectra, and almost all components of different periods are amplified by the soil site. The mean amplification factors are 1.66 and 2.43 from the very dense soil and stiff soil sites to rock site respectively in a wide range of periods. The site conditions must be considered sufficiently and carefully in the work of the seismic hazard analysis, seismic zonation, etc.
Mao-sheng Gong Li-Li Xie
Institute of Engineering Mechanics, CEA, Harbin, China Harbin Institute of Technology, Harbin, China
国际会议
哈尔滨
英文
637-643
2009-07-22（万方平台首次上网日期，不代表论文的发表时间）