剪切波速对场地地表地震动参数的影响
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摘要
本文以江淮地区典型场地资料为原型,将土层剪切波速实测值按照一定比例进行增减,构造多种场地土层地震反应分析模型,选择Taft、E1centro和Kobe三条强震记录作为地震输入,采用一维频域等效线性化波动方法进行了土层地震反应分析。研究结果表明,剪切波速的变异性与场地地表地震动的影响程度与输入基岩地震动的频谱特性、幅值、土层结构等因素有关。地表峰值加速度随着剪切波速的增大而逐渐增大,地表加速度反应谱的特征周期随着剪切波速的增大而逐渐减小。
Based on the data from typical sites in Jianghuai Region,many kinds of soil layer sites for the seismic response is modeled by increasing and decreasing the real test values of shear wave velocity to a scale.The seismic response of the soil layer sites is calculated with the one dimension equivalent linear method in frequency domain by choosing the Taft,Kobe and Elcentro strong motion record as the earthquake input.Our results show that the effect degree of velocity variation on the ground motion is in relation to the spectral characteristic of bedrock input earthquake motion,amplitude and soil layer structure.When the shear wave velocity increases,the peak acceleration increases,however,the characteristic period of the acceleration response spectra decreases.
Based on the data from typical sites in Jianghuai Region,many kinds of soil layer sites for the seismic response is modeled by increasing and decreasing the real test values of shear wave velocity to a scale.The seismic response of the soil layer sites is calculated with the one dimension equivalent linear method in frequency domain by choosing the Taft,Kobe and Elcentro strong motion record as the earthquake input.Our results show that the effect degree of velocity variation on the ground motion is in relation to the spectral characteristic of bedrock input earthquake motion,amplitude and soil layer structure.When the shear wave velocity increases,the peak acceleration increases,however,the characteristic period of the acceleration response spectra decreases.
引文
陈国兴,刘雪珠,王炳辉,2007.土动力参数变异性对深软场地地表地震动参数的影响.防灾减灾工程学报,27 (1):1—10.
高玉峰,刘汉龙,朱伟等,2001.剪切波速对砂土层地震反应的影响.工程勘察,(1):39—42.
胡聿贤,高盂潭,杜玮等,2001.《中国地震动参数区划图》宣贯教材.北京:中国标准出版社,85—87.
兰景岩,薄景山,吕悦军,2007.剪切波速对设计反应谱的影响研究.震灾防御技术,2(1):19—24.
廖振鹏,李小军,1989.地表土层地震反应的等效线性化解法.见:地震小区化(理论与实践).北京:地震出版社,141—153.
刘红帅,薄景山,吴兆营等,2005.土体参数对地表加速度峰值和反应谱的影响.地震研究,28(2):167—171.
孙锐,袁晓铭,刘晓键,2009.动剪切模量比与剪切波速对地震动影响及等量关系研究.岩土工程学报,31(8):1267—1274.
袁晓铭,孙锐等,2000.常规土类动剪切模量和阻尼比试验研究.地震工程与工程振动,20(4):133—139.
中华人民共和国国家标准,2005.工程场地地震安全性评价(GB 17741-2005).北京:中国标准出版社.
高玉峰,刘汉龙,朱伟等,2001.剪切波速对砂土层地震反应的影响.工程勘察,(1):39—42.
胡聿贤,高盂潭,杜玮等,2001.《中国地震动参数区划图》宣贯教材.北京:中国标准出版社,85—87.
兰景岩,薄景山,吕悦军,2007.剪切波速对设计反应谱的影响研究.震灾防御技术,2(1):19—24.
廖振鹏,李小军,1989.地表土层地震反应的等效线性化解法.见:地震小区化(理论与实践).北京:地震出版社,141—153.
刘红帅,薄景山,吴兆营等,2005.土体参数对地表加速度峰值和反应谱的影响.地震研究,28(2):167—171.
孙锐,袁晓铭,刘晓键,2009.动剪切模量比与剪切波速对地震动影响及等量关系研究.岩土工程学报,31(8):1267—1274.
袁晓铭,孙锐等,2000.常规土类动剪切模量和阻尼比试验研究.地震工程与工程振动,20(4):133—139.
中华人民共和国国家标准,2005.工程场地地震安全性评价(GB 17741-2005).北京:中国标准出版社.
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