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本文在吸收Seed及Streeter等人近年来工作成果的基础上,利用特征线-差分混合解法,提出了新的差分格式并求解了包含粘性、弹塑性的水平土层在地震剪切波作用下的运动方程。在引入阻尼比退化系数的概念后,提出了能同时符合土的剪切模量-剪应变和阻尼比-剪应变非线性试验曲线的加载、卸载、再加载分析曲线——广义Masing型曲线。本文提供的方法与程序可方便地对水平土层的地震反应作出估计,可作为烈度小区划中考虑场地土影响和提供设计反应谱的分析工具。
This paper absorbs the work of Seed and Streeter et al. in recent years and uses the line-difference hybrid method to propose a new difference scheme and solves the problem of the horizontal soil layer containing viscosity and elastoplasticity under the action of seismic shear waves. The equation of motion. After the introduction of the concept of damping ratio degradation coefficient, a generalized Masing-type curve was proposed to analyze the loading, unloading and reloading curves of the nonlinear test curve that can simultaneously meet the shear modulus-shear strain and damping ratio-shear strain of soil. The method and procedure provided in this paper can easily estimate the seismic response of horizontal soil layers. It can be used as an analytical tool for considering the influence of site soil and providing design response spectrum for the intensity of the plot.