摘要
土的动力非线性实验一般给出无量纲动力剪切模量G/G_(max)与剪应变γ的关系曲线以及滞回阻尼比λ与剪应变γ的关系曲线。同时,在地震工程主要关心的周期范围(例如0.1—10秒)内的地震荷载频率对以上两类经验曲线的影响不明显。为了获得一个与以上实验结果相一致的应力-应变关系,本文提出了一种具有粘性、弹性及塑件三种效应的应力-应变关系物理模型——粘-弹-塑模型(Visco-Elasto-Plastic Model),简称VEPM。这一模型能同时拟台G/G_(max)-γ和λ-γ两条实验曲线,且能很好地满足它们与加载频率无关的要求。本文还将VEPM与以往模型进行了对比,讨论了VEPM的物理意义。最后,给出了将VEPM应用于土层地震反应计算的两个实例。
Dynamic experiments on non-linear characteristics of soil samples have shown that the damping ratio does not much depend on frequency in the meaningful band in earthquake engineering. A Visco-Elasto-Plastic Model of soil stress-strain relationship is presented in the paper and is in consistent with the above experimental conclusion as well as other experimental correlations relevant to the non-linear characteristics of soil. The model has been compared with previous models of soil stress-strain correlation, and advantages and physical meaning of the model are then discussed. An example is finally presented for illustration of application of the model to computalion of earthquake response of soil layers.
出处
《地震工程与工程振动》
CSCD
北大核心
1989年第3期65-72,共8页
Earthquake Engineering and Engineering Dynamics
基金
地震科学联合基金
核电站招标项目的资助
