中文摘要：

提出了场地总体非线性动力特性识别的一个方法。方法以一已知参考场地为基础，假定待识别场地和参考场地具有相同的基岩露头运动，根据待识别场地和参考场地地表强震和弱震记录，识别场地的总体非线性动力特性。以天津地区两个实际场地（一个作为参考场地，一个作为待识别场地）为例对场地总体非线性动力特性进行了识别。研究表明：方法能准确识别场地总体非线性动力特性，可直接应用于实际工程。

英文摘要：

A method of estimating the general nonlinear dynamic characteristics is proposed, i.e., the relation between dynamic shear modulus and shear strain and the relation between damping ratio and shear strain, of an unknown site, in which, a known reference site is introduced, and both the unknown site and the reference site are assumed to have the same bedrock outcrop motion, and strong shock and weak shock records of the two sites are used for the estimation. To verify the method, the general nonlinear dynamic characteristics of two real sites in Tianjin district are estimated, and the surface seismic responses and their response spectra of the unknown site under the excitation of Hollywood wave and Treasure Island wave are calculated. It is shown that the proposed method can accurately estimate the general nonlinear dynamic characteristics of the unknown site, and it can be directly applied to engineering practices.