场地地震反应的比较研究
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摘要
用数值分析方法计算分析了场地地震反应。针对几种典型场地,分别采用频域等效线性化波动法(以下简称波动法)和有限元法,分析比较了在6种地震波作用下场地土的地震反应特性、有限元法和波动法间的数值差异、盆地模型和水平分层模型的地表地震反应特性及差异,并用Drucker-Prager模型模拟盆地沉积物介质的非线性。结果显示,有限元法求得的土层表面加速度峰值大于波动法;盆地的松散沉积物对地震波有明显的放大作用,盆地中部区域的最大地震反应与水平分层模型相应结果接近;在El-Centro波作用下,盆地表面的非线性位移反应较线性情形增大明显。
In this paper,we study the effect of seismic responses of sites on input motions and numerical methods and models.We compare the seismic responses of typical construction sites to six different input motions using the frequency domain method,the seismic responses of two construction sites using two different numerical methods-the finite element method and the frequency domain method, and the seismic responses of a basin model with a horizontally layered model using the finite element method.Moreover,we analyze the nonlinear seismic responses of the basin based on Drucker-Prager models.Our study reveals that: the acceleration responses of the sites surfaces are larger using the finite element method than those using the frequency domain method;the seismic responses are significantly enlarged due to loose soil in the basin,the peak seismic responses of the basin surface are closely approximated by the horizontally layered model;and the nonlinear displacement responses of the basin surfaces are larger than the linear ones on the El-Centro input.
In this paper,we study the effect of seismic responses of sites on input motions and numerical methods and models.We compare the seismic responses of typical construction sites to six different input motions using the frequency domain method,the seismic responses of two construction sites using two different numerical methods-the finite element method and the frequency domain method, and the seismic responses of a basin model with a horizontally layered model using the finite element method.Moreover,we analyze the nonlinear seismic responses of the basin based on Drucker-Prager models.Our study reveals that: the acceleration responses of the sites surfaces are larger using the finite element method than those using the frequency domain method;the seismic responses are significantly enlarged due to loose soil in the basin,the peak seismic responses of the basin surface are closely approximated by the horizontally layered model;and the nonlinear displacement responses of the basin surfaces are larger than the linear ones on the El-Centro input.
引文
[1]周锡元.土质条件对建筑物所受地震荷载的影响[A].中国科学院工程力学研究所地震工程研究报告集[C](第二集).北京:科学出版社,1965.
[2]胡聿贤,孙平善,章在墉,等.场地条件对震害和地震动的影响[J].地震工程与工程振动,1980,试(1):35-41.
[3]薄景山,李秀领,李山有.场地条件对地震动影响研究的若干进展[J].世界地震工程,2003,19(2):11-15.
[4]Idriss IM,etc.Seismic response of horizontal Soic Layers[J].ASCE,1968,94(SM4):1003.
[5]廖振鹏,李小军.地表土层地震反应的等效线性化解法[A].地震小区划-理论与实践[C].北京:地震出版社,1989,141-153.
[6]大崎顺彦.Characteristics and One-Dimensional Linear Amplifi-cation Theory of Soil Deposits[A].《大崎顺彦博士论文集》[C].1982:601-653.
[7]王志良,韩清宇.粘弹塑性土层地震反应的波动分析法[J].地震工程与工程震动,1981,1(1):117-137.
[8]廖河山,徐植信.场地土的一维非线性地震反应分析方法[J].地震工程与工程震动,1992,12(4):30-39.
[9]谢小碧,姚振兴.二维不均匀介质中点源P-SV波响应的有限差分算法[J].地球物理学报.1988,31:540-555.
[2]胡聿贤,孙平善,章在墉,等.场地条件对震害和地震动的影响[J].地震工程与工程振动,1980,试(1):35-41.
[3]薄景山,李秀领,李山有.场地条件对地震动影响研究的若干进展[J].世界地震工程,2003,19(2):11-15.
[4]Idriss IM,etc.Seismic response of horizontal Soic Layers[J].ASCE,1968,94(SM4):1003.
[5]廖振鹏,李小军.地表土层地震反应的等效线性化解法[A].地震小区划-理论与实践[C].北京:地震出版社,1989,141-153.
[6]大崎顺彦.Characteristics and One-Dimensional Linear Amplifi-cation Theory of Soil Deposits[A].《大崎顺彦博士论文集》[C].1982:601-653.
[7]王志良,韩清宇.粘弹塑性土层地震反应的波动分析法[J].地震工程与工程震动,1981,1(1):117-137.
[8]廖河山,徐植信.场地土的一维非线性地震反应分析方法[J].地震工程与工程震动,1992,12(4):30-39.
[9]谢小碧,姚振兴.二维不均匀介质中点源P-SV波响应的有限差分算法[J].地球物理学报.1988,31:540-555.
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