复杂V型谷地条件下地震动数值模拟的比较
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摘要
二维复杂场地存在覆盖土层时,场地条件的复杂性及不确定性会给工程设计带来很大的困扰。研究复杂场地下不同分析模型及参数不确定性对地震动产生影响具有重要的工程意义。本文根据工程中常用的典型分析模型,运用了与传递函数相关的分析手段,基于含有覆盖土层的二维V型谷II及III类场地,建立了一维等效线性化、二维均匀场地、线性二维非均匀场地及考虑非线性特征的二维非均匀场地四种地面运动计算分析模型,主要对比研究了不同分析模型对地震动的影响,进一步还讨论了考虑非线性特征的二维场地修正分析模型中由于阻尼参数的不确定性对其地面运动分析结果造成的影响。结果表明土层及复杂地形均对地面运动产生影响,二维修正模型中工程有意义的不同阻尼比仅对场地反应高频段有较小的影响,为建立复杂场地地震动分析模型及阻尼参数的选取提供有意义的指导及建议。
The diversity and complexity of site will bring great trouble in engineering design when the covering soil layer exists on two-dimensional site. Studying the different analysis models on complex sites and the uncertainty of parameters on ground motion has important engineering significance. Basing on some typical analysis models in engineering and the analysis method of transfer function,some characteristics on the two-dimensional V-shape of class II and III site with covering soil layer are discussed. These typical models are established in this paper including the one-dimensional equivalent linearization,two-dimensional homogeneous site,two-dimensional linear unhomogeneous site and two-dimensional unhomogeneous site which considers nonlinear character. The effects for the different analysis models on ground motion and uncertain of damping parameter on ground motion analysis on the two-dimensional unhomogeneous site which considers the nonlinear characteristics is compared in detail. The result shows that soil layers and complex topography have effect on ground motion. The damping which is useful for engineering design on two-dimensional revising model just affect the high frequency stage,which has provided significant guidance and advices when the damping coefficer is selected during establishing complex site for ground motion analysis.
The diversity and complexity of site will bring great trouble in engineering design when the covering soil layer exists on two-dimensional site. Studying the different analysis models on complex sites and the uncertainty of parameters on ground motion has important engineering significance. Basing on some typical analysis models in engineering and the analysis method of transfer function,some characteristics on the two-dimensional V-shape of class II and III site with covering soil layer are discussed. These typical models are established in this paper including the one-dimensional equivalent linearization,two-dimensional homogeneous site,two-dimensional linear unhomogeneous site and two-dimensional unhomogeneous site which considers nonlinear character. The effects for the different analysis models on ground motion and uncertain of damping parameter on ground motion analysis on the two-dimensional unhomogeneous site which considers the nonlinear characteristics is compared in detail. The result shows that soil layers and complex topography have effect on ground motion. The damping which is useful for engineering design on two-dimensional revising model just affect the high frequency stage,which has provided significant guidance and advices when the damping coefficer is selected during establishing complex site for ground motion analysis.
引文
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[2]杨笑梅,郭钦华.二维复杂工程场址设计地震动的修正分析方法[J].世界地震工程,2007(2):112-117.YANG Xiaomei,GUO Qinhua.Correctional analysis method for design of ground motion in two-dimensional complex sites[J].World Earthquake Engineering,2007(2):112-117.(in Chinese)
[3]杨笑梅,周克森,郭钦华.广东省阳江抽水蓄能电站二维工程场址对设计地震动的影响分析[J].华南地震,2007(1):45-50.YANG Xiaomei,ZHOU Kesen,GUO Qinhua.Analysis of the influence of 2D engineering site at yangjiang storeage energy power station on designed ground motion[J].South China Journal of Seismology,2007(1):45-50.(in Chinese)
[4]廖振鹏,李小军.地表土层地震反应的等效线性化解法:地震小区划[J].1989(989).LIAO Zhenpeng,LI Xiaojun.Equivalent linear method of soil seismic response:Seismic Microzonation[J].1989(989).(in Chinese).
[5]廖振鹏.工程波动理论导引[M].科学出版社,1996.LIAO Zhenpeng.Guided wave theory[M].Science Press.1996.(in Chinese)
[6]杨笑梅,王海涛,杨柏坡.竖向地裂缝附近的地面运动[J].地震工程与工程振动,2005(5):36-42.YANG Xiaomei,WANG Haitao,YANG Baipo.The vertical cracks near the ground movement[J].Journal of Earthquake Engineering and Engineering Vibration,2005(5):36-42.(in Chinese)
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