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

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.