烟台海岸软土场地特征及对地震动参数的影响
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摘要
本文利用剪切波速和钻孔资料 ,根据中国GB50 0 1 1 2 0 0 1规范、美国FEMA NEHRP规范、欧洲EUROCODE 8规范 ,对烟台滨海软土场地类别进行评定。并通过场地地震动效应分析 ,研究滨海场地土特征对地震动的影响。结果表明 ,简单的场地类别划分难以反映软土场地的实际情况 ;滨海软土场地对地震动加速度的幅值和频谱的影响非常明显 ,其对峰值加速度的放大倍数较高 ,但受土的非线性变形影响 ,随地震动输入的增大其放大倍数呈非线性降低 ;软土场地使得加速度反应谱谱形变宽 ,特征周期变大。
According to the Chinese GB50011-2001 Code, recommended provisions of HEHRP and EUROCODE 8, the authors used the shear wave velocity and borehole data to study the site classification for typical soil site in the Yantai seashore. The site seismic effect is analyzed and the influence of the soil on the design ground motion parameters are discussed. The results show that:(1)It is hard to represent the real characteristics of the seashore site by the brief classification; (2)The seashore soft soil puts a remarkable effect on the magnitude and spectrum of the ground motion, the acceleration is bigger magnified up, due to the nonlinear deformation of the soil, the amplification factor is reduced nonlinearly with the increase of ground motion input; (3)The spectrum is broadened and the characteristic period is extended.
引文
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