基于现行规范场地划分标准的地震动反应谱衰减关系

The attenuation relations of response spectra based on classified site criterion in current seismic design code

根据钻孔资料,将各国强震记录按照我国《建筑抗震设计规范》(GB50011-2001)中的规定进行场地分类,利用这些强震记录,统计分析了Ⅰ、Ⅱ、Ⅲ类场地的地震动加速度反应谱的衰减关系并分析了其特点。当震级和震中距相同时,土层场地的反应谱在大多数周期上要比基岩场地的大一些,这也说明了,设计反应谱的最大值随场地条件是变化的。文中结果为我国土层场地的地震动加速度反应谱估计提供了依据。

The strong motion records with boring data of classified sites according to Code for Seismic Design of Buildings(GB 50011-2001)are adopted to analyze attenuation relations of response spectra in three kinds of sites by statistic method,and the characters of the attenuation relations are analyzed.That is the spectra values in soil sites is larger than in rock sites,which show that the maximum value of response spectra should vary with site conditions.The attenuation relations provide basis for estimation of the design ground motion parametres on different kind of sites(especially on soil site) in China.