| 天津滨海场地土类别特征及其对地震动的影响 |
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| 引用本文： | 彭艳菊,唐荣余,吕悦军,沙海军.天津滨海场地土类别特征及其对地震动的影响[J].地震工程与工程振动,2004,24(2):46-52. |
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| 作者姓名： | 彭艳菊 唐荣余 吕悦军 沙海军 |
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| 作者单位： | 中国地震局地壳应力研究所,北京,100085 |
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| 基金项目： | 中国地震局"十五"重点科研项目 |
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| 摘 要： | 本文按照三种规范(中国建筑抗震设计规范(GBS0011-2001)、美国FEMA-NEHRP规范(2000)、欧洲结构抗震规范(EUROCODE 8，1998))，利用钻孔和剪切波速资料，对天津滨海地区的场地土类别进行研究。通过场地地震动效应分析，研究该场地土对地震动的影响。结果表明，对于滨海场地，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高达1．9，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，变化幅度在0．1s—0．4s。
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| 关 键 词： | 地震动 场地类别 放大效应 特征周期 |
| 文章编号： | 1000-1301(2004)02-0046-07 |
Tianjin seashore site classification and its effect on ground motion |
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| PENG Yan-ju,TANG Rong-yu,LU Yue-jun,SHA Hai-jun.Tianjin seashore site classification and its effect on ground motion[J].Earthquake Engineering and Engineering Vibration,2004,24(2):46-52. |
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| Authors: | PENG Yan-ju TANG Rong-yu LU Yue-jun SHA Hai-jun |
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| Abstract: | In the light of shear wave velocity and borehole data, the seashore site in Tianjin is classified by three codes, i.e. Chinese code for seismic design of buildings (GB50011-2001), Recommended provisions of NEHRP of U.S. and EUROCODE 8, then the effect on ground motion caused by the site is discussed. The results show that (1)it is hard to represent the real characteristics of the seashore site by the brief classification, and (2)the seashore soft soil gives a remarkable effect on the magnitude and spectrum of the ground motion, the acceleration is magnified up to 1.9 times due to the nonlinear deformation of the soil,and the amplification factor is reduced nonlinearly with the increase of ground motion input, (3)the spectrum is broadened and the characteristic period is extended by 0.1sec to 0.4sec. |
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| Keywords: | seashore site in Tianjin site classification amplification effect predominant period |
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