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场地地震反应问题最初是按等价线性粘弹性模型来考虑土的非线性特点的。近年来,迅速发展起真正非线性的方法。本文提出的土的非线性模型可以同时符合均匀循环荷载下的剪切模量与剪应变、阻尼比与剪应变曲线,并且可以计入粘滞阻尼的影响。为了适应不规则的剪应力循环荷载,提出了加卸载的准则及孔隙水压力生长的分数循环估算法。本文建议的模型已用于总应力法的场地地震反应计算机程序中。
The field seismic response problem was originally based on the equivalent linear viscoelastic model to consider the nonlinear characteristics of the soil. In recent years, a truly nonlinear approach has rapidly developed. The soil nonlinear model proposed in this paper can simultaneously meet the shear modulus and shear strain, damping ratio and shear strain curve under uniform cyclic loading, and can be included in the impact of viscous damping. In order to adapt to the irregular cyclic loading of shear stress, the criteria of loading and unloading and the fractional cyclic estimation of pore water pressure growth are proposed. The model proposed in this paper has been used in the site seismic response computer program of the total stress method.