土层参数随机性对多层土模型传递函数的影响
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摘要
土体的地震反应与结构震害密切相关,是地震工程中的一个重要问题,也是抗震设计的基础之一。然而目前的工程场地地震反应分析中存在着诸多不确定性因素,如何估计这些不确定的影响是一个亟待解决的问题。本文采用泰勒级数展开估计土层参数随机性对场地传递函数的影响。以两层土模型为例,对多层土模型在土层参数服从独立高斯分布假定下进行公式推导和实例计算,比较了不同的泰勒级数阶次、土层参数变异系数以及阻尼比对传递函数随机性的综合效应。
Soil earthquake responses are a kind of important problems in earthquake engineering.It is also closely related to seismic damage of structure and is one of foundations of earthquake-resistance design.But there are many indeterminacy factors in soil earthquake response analysis.So how to estimate the influence of indeterminacy factors is a problem that need resolved urgently.By expanding in the Taylor series,we estimate the effect of the soil parameter variations on the soil transfer function in this paper.For multi-layered model of a site,the variation of the soil transfer has been compared with different orders of Taylor series and soil variance coefficients and damping ratios when the variation of soil parameters is assumed to be independent Gaussian distribution.
Soil earthquake responses are a kind of important problems in earthquake engineering.It is also closely related to seismic damage of structure and is one of foundations of earthquake-resistance design.But there are many indeterminacy factors in soil earthquake response analysis.So how to estimate the influence of indeterminacy factors is a problem that need resolved urgently.By expanding in the Taylor series,we estimate the effect of the soil parameter variations on the soil transfer function in this paper.For multi-layered model of a site,the variation of the soil transfer has been compared with different orders of Taylor series and soil variance coefficients and damping ratios when the variation of soil parameters is assumed to be independent Gaussian distribution.
引文
[1]廖振鹏.工程波动理论导引[M],北京:科学出版社,2002.136-138
[2]窦立军,杨柏坡.场地条件对传递函数的影响[J].建筑科学,2001,17(3):40-46
[3]赵松戈,胡聿贤,廖旭.土层参数的随机性对场地传递函数的影响[J].地震工程与工程振动,2000,20(2):7-12
[4]Suzukis,Asano K.Effect of different layered ground models on dynamic amplification considering the soil parameter variations[c],Proc.of 11WCEE1181-1188,1996
[5]H.Bolton Seed.Influence of Soil Conditions on Ground Motions During Earthquakes[J],ASCE,1969:95-108
[6]Nasser Moeen-Vaziri,MD Trifunac Scattering and diffraction of plane SH-waves by two-dimensional inhomogeneities:PartⅠ[J],Soil Dy-namics and Earthquake Engineering,1988,7(4):179-188
[7]胡聿贤.地震工程学[M].北京:地震出版社,1988
[8]A Hayir,MI Todorovska,MD Trifunac.Antiplane response of a dike with flexible soil-structure interface to incident SHwaves[J].Soil Dy-namics and Earthquake Engineering,2001,21:603-613
[2]窦立军,杨柏坡.场地条件对传递函数的影响[J].建筑科学,2001,17(3):40-46
[3]赵松戈,胡聿贤,廖旭.土层参数的随机性对场地传递函数的影响[J].地震工程与工程振动,2000,20(2):7-12
[4]Suzukis,Asano K.Effect of different layered ground models on dynamic amplification considering the soil parameter variations[c],Proc.of 11WCEE1181-1188,1996
[5]H.Bolton Seed.Influence of Soil Conditions on Ground Motions During Earthquakes[J],ASCE,1969:95-108
[6]Nasser Moeen-Vaziri,MD Trifunac Scattering and diffraction of plane SH-waves by two-dimensional inhomogeneities:PartⅠ[J],Soil Dy-namics and Earthquake Engineering,1988,7(4):179-188
[7]胡聿贤.地震工程学[M].北京:地震出版社,1988
[8]A Hayir,MI Todorovska,MD Trifunac.Antiplane response of a dike with flexible soil-structure interface to incident SHwaves[J].Soil Dy-namics and Earthquake Engineering,2001,21:603-613
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