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场地的土体类型对建筑的抗震设计参数影响很大,湖相沉积软土在地震波作用时,土体应力-应变响应会进入非线性范围,工程中常用的等效线性化方法会严重低估地表的峰值加速度,对建筑的抗震性能非常不利。本文利用时域直接积分方法对含湖相淤泥质软土的工程场地进行了土层计算并进行了对比。与等效线性化方法比较发现,在大震作用下,土体可能进入大的非线性范围,等效线性化将不再适用。在此基础上,给出了确定含湖相软土的工程场地设计地震动参数的处理建议。
The soil types of the site have a great influence on the seismic design parameters of the building. When the lacustrine soft clay is subjected to seismic waves, the soil stress-strain response will enter a non-linear range. The equivalent linearization method commonly used in engineering will seriously underestimate the surface The peak acceleration, the seismic performance of the building is very negative. In this paper, the time domain direct integration method is used to calculate the soil layers of engineering sites with lacustrine muddy soil and compare them. Compared with the equivalent linearization method, it is found that the soil may enter a large non-linear range under the action of a large earthquake, and the equivalent linearization will no longer be applicable. On this basis, some suggestions on how to determine the ground motion parameters of engineering site with lake facies are given.