上海软土动力参数变异性对土层地震反应的影响
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摘要
应用模态摄动法求解水平分层均匀土层的地震反应,通过大量的数值计算,讨论上海软土土性变化对土层基本周期和表面地震加速度反应的影响。数值结果表明:准确获取土层的动力参数对土层地震反应计算有重要影响,在现场实测获得较为翔实的土样动力特性参数的基础上,土层土性动力参数变异性所产生的计算误差是有限的。
The seismic response of a layered soil in Shanghai region is analyzed by modal perturbation method. The effect of dynamic property variation of soil on the fundamental period of layered soil and the peak acceleration of seismic response at soil surface has been discussed by the determinate technique instead of random analysis. It is shown by using numerical results obtained from many case studies that acquiring accurately the dynamic property of soil medium from the soil site field is important for the seismic response analysis of layered soil and that the effect of variability of dynamic soil properties, which are measured accurately from the soil site field, on the calculation errors of seismic responses and fundamental period of the soil layer is limited.
The seismic response of a layered soil in Shanghai region is analyzed by modal perturbation method. The effect of dynamic property variation of soil on the fundamental period of layered soil and the peak acceleration of seismic response at soil surface has been discussed by the determinate technique instead of random analysis. It is shown by using numerical results obtained from many case studies that acquiring accurately the dynamic property of soil medium from the soil site field is important for the seismic response analysis of layered soil and that the effect of variability of dynamic soil properties, which are measured accurately from the soil site field, on the calculation errors of seismic responses and fundamental period of the soil layer is limited.
引文
[1]GB17741-1999,场地地震安全性评价技术规范[S].
[2]HardinB C,DrnevichV P.Shear modulus and damping in soil: design and curves[J].Journal ofSoilMechanics andFoundationsDivision.AmericanSociety ofCivilEngineering,1972,98:667-692.
[3]石兆吉.土壤的动剪模量和阻尼比[A].地震小区划——理论与实践[C].北京:地震出版社,1989.
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[5]袁晓铭,孙锐,孙静等.常规土类动剪模量比和阻尼比试验研究[J].地震工程与工程振动,2000,20(4):133-139.YUAN Xiao-ming,SUN Rui,SUN Jing, et al.Laboratory experimental study on dynamic shear modulus ratio and damping ratio of soil[J].EarthquakeEngineering andEngineeringVibration,2000,20(4):133-139.
[6]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.ZHAO Song-ge,HU Yu-xian,LIAO Xu.Effect of soil parameter variations on soil transfer function[J].EarthquakeEngineering andEngineeringVibration,2000,20(2):7-12.
[7]王绍博,丁海平.土动力参数对土层动力反应的影响[J].地震工程与工程振动,2001,21(1):105-108.WANG Shao-bo,DING Hai-ping.Effect of soil dynamic parameters on seismic responses of soil layers[J].EarthquakeEngineering andEngineeringVibration,2001,21(1):105-108.
[8]BrajaM Das.Fundamentals of soil dynamics[M].NewYork:ElsevierPress,1983.
[9]楼梦麟.变参数土层的动力特性和地震反应分析[M].同济大学学报,1997,25(2):155-160.LOU Meng-lin.Dynamic analysis for modal characteristics and seismic responses of soil layer with variable properties[J].Journal ofTongjiUniversity,1997,25(2):155-160.
[2]HardinB C,DrnevichV P.Shear modulus and damping in soil: design and curves[J].Journal ofSoilMechanics andFoundationsDivision.AmericanSociety ofCivilEngineering,1972,98:667-692.
[3]石兆吉.土壤的动剪模量和阻尼比[A].地震小区划——理论与实践[C].北京:地震出版社,1989.
[4]祝龙根,杜坚.不同共振柱仪的对比试验[J].大坝观察与土工试验,1990,(3):25-32.ZHU Long-gen,DU Jian.Comparison of resonant column tests[J].DamObservation andSoilPropertyTest,1990,(3):25-32.
[5]袁晓铭,孙锐,孙静等.常规土类动剪模量比和阻尼比试验研究[J].地震工程与工程振动,2000,20(4):133-139.YUAN Xiao-ming,SUN Rui,SUN Jing, et al.Laboratory experimental study on dynamic shear modulus ratio and damping ratio of soil[J].EarthquakeEngineering andEngineeringVibration,2000,20(4):133-139.
[6]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.ZHAO Song-ge,HU Yu-xian,LIAO Xu.Effect of soil parameter variations on soil transfer function[J].EarthquakeEngineering andEngineeringVibration,2000,20(2):7-12.
[7]王绍博,丁海平.土动力参数对土层动力反应的影响[J].地震工程与工程振动,2001,21(1):105-108.WANG Shao-bo,DING Hai-ping.Effect of soil dynamic parameters on seismic responses of soil layers[J].EarthquakeEngineering andEngineeringVibration,2001,21(1):105-108.
[8]BrajaM Das.Fundamentals of soil dynamics[M].NewYork:ElsevierPress,1983.
[9]楼梦麟.变参数土层的动力特性和地震反应分析[M].同济大学学报,1997,25(2):155-160.LOU Meng-lin.Dynamic analysis for modal characteristics and seismic responses of soil layer with variable properties[J].Journal ofTongjiUniversity,1997,25(2):155-160.
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