动剪切模量比与剪切波速对地震动影响及等量关系研究
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摘要
采用数值模拟方法,研究动剪切模量比和剪切波速对地震动的影响问题,并以对地表加速度反应谱影响为标准研究动剪切模量比变化与剪切波速变化间的对等关系,同时建立了等价关系式,分析中考虑了场地类别、场地遭遇地震强度和地震输入波型的影响。结果表明:①动剪切模量比误差和剪切波速误差对地震动都有着重要影响,在土体强非线性和软弱场地中影响更为强烈,实测的动剪切模量比和剪切波速比真实值低时较比真实值高时对地表反应谱影响更大,三类场地0.1g地震输入时动剪切模量比6%误差或剪切波速25%误差的影响已经不可忽视;②对不同的场地类别、场地地震烈度和地震输入波情况,动剪切模量比单独变化与剪切波速单独变化对反应谱的影响都具有对等关系;③动剪切模量比误差对地震动的影响程度要大于剪切波速误差,二者对地表反应谱的敏感性相差3～5倍,绝对误差相同时动剪切模量比降低情况下与剪切波速的敏感程度相差更大。
The effects of the dynamic shear modulus ratio and the shear wave velocity on the surface ground motion and their equivalent effect relations with surface acceleration spectra are investigated by use of the numerical simulation method considering site types, incident seismic intensities and incident seismic wave forms. The results indicate that the errors of dynamic shear modulus ratio and the shear wave velocity both have strong effects on the surface ground motion. The effects of the dynamic shear modulus ratio and the shear wave velocity are more significant for strong nonlinear property in the weak site as well as for the cases when the two parameters by the tests are lower than the actual values, e.g., 6% error of the dynamic shear modulus ratio and 25% error of the shear wave velocity for 0.1g incidence in site Ⅲ can not be neglected. The effects of the dynamic shear modulus ratio alone and the shear wave velocity alone on the spectra can be expressed by the equivalent relationships for different site types, incident seismic intensities and incident seismic wave forms. The extent of the effects of the dynamic shear modulus ratio on the spectra is much larger than the shear wave velocity by 3~5 times and the difference of the sensitive extent between the two parameters for the decreasing of the dynamic shear modulus ratio is more obvious than that of the cases for the increasing of the dynamic shear modulus ratio.
The effects of the dynamic shear modulus ratio and the shear wave velocity on the surface ground motion and their equivalent effect relations with surface acceleration spectra are investigated by use of the numerical simulation method considering site types, incident seismic intensities and incident seismic wave forms. The results indicate that the errors of dynamic shear modulus ratio and the shear wave velocity both have strong effects on the surface ground motion. The effects of the dynamic shear modulus ratio and the shear wave velocity are more significant for strong nonlinear property in the weak site as well as for the cases when the two parameters by the tests are lower than the actual values, e.g., 6% error of the dynamic shear modulus ratio and 25% error of the shear wave velocity for 0.1g incidence in site Ⅲ can not be neglected. The effects of the dynamic shear modulus ratio alone and the shear wave velocity alone on the spectra can be expressed by the equivalent relationships for different site types, incident seismic intensities and incident seismic wave forms. The extent of the effects of the dynamic shear modulus ratio on the spectra is much larger than the shear wave velocity by 3~5 times and the difference of the sensitive extent between the two parameters for the decreasing of the dynamic shear modulus ratio is more obvious than that of the cases for the increasing of the dynamic shear modulus ratio.
引文
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[7]刘红帅,薄景山,吴兆营,等.土体参数对地表加速度峰值和反应谱的影响[J].地震研究,2005(2):161–171.(LIU Hong-shuai,BO Jing-shan,WU Zhao-ying,et al.Effects of soil parameters on ground surface acceleration peak and response spectra[J].Journal of Seismological Research,2005(2):161–171.(in Chinese))
[8]李小军,彭青.不同类别场地地震动参数的计算分析[J].地震工程与工程振动,2001,21(1):29–36.(LI Xiao-jun,PENG Qing.Calculation and analysis of earthquake ground motion parameters for different site categories[J].Earthquake Engineering and Engineering Vibration,2001,21(1):29–36.(in Chinese))
[9]GB50011—2001建筑抗震设计规范[S].2001.(GB0011—2001Code for seismic design of buildings[S].2001.(in Chinese))
[2]廖振鹏.地震小区划(理论与实践)[M].北京:地震出版社,1989.(LIAO Zhen-peng.Seismic microzonation[M].Beijing:Seismic Publishing House,1989.(in Chinese))
[3]高玉峰,刘汉龙,朱伟,等.剪切波速对砂土层地震反应的影响[J].工程勘察,2001(1):39–42.(GAO Yu-feng,LIU Han-long,ZHU Wei,et al.Influences of shear wave velocity on the seismic response of sand ground[J].Geotechnical Investigation&Surveying,2001(1):39–42.(in Chinese))
[4]陈国兴,刘雪珠,王炳辉.土动力参数变异性对深软场地地表地震动参数的影响[J].防灾减灾工程学报,2007,27(1):1–10.(CHEN Guo-xing,LIU Xue-zhu,WANG Bing-hui.Effect of variability of soil dynamic parameters on ground motion parameters for deep soft sites[J].Journal of Disaster Prevention and Mitigation Engineering,2007,27(1):1–10.(in Chinese))
[5]冯志仁,郭德存,刘红帅,等.最大剪切模量对土动力参数及地震反应的影响[J].自然灾害学报,2007,16(3):90–95.(FENG Zhi-ren,GUO De-cun,LIU Hong-shuai,et al.Influence of maximum shear modulus on dynamic parameters and seismic response of soil layer[J].Journal of Natural Disasters,2007,16(3):90–95.(in Chinese))
[6]孙静,袁晓铭.剪切模量和阻尼比的推荐值和规范值的合理性比较[J].地震工程与工程振动,2004,24(2):126–133.(SUN Jing,YUAN Xiao-ming.Reasonability comparison between recommended and code values of dynamic shear modulus and damping ratio of soils[J].Earthquake Engineering and Engineering Vibration,2004,24(2):126–133.(in Chinese))
[7]刘红帅,薄景山,吴兆营,等.土体参数对地表加速度峰值和反应谱的影响[J].地震研究,2005(2):161–171.(LIU Hong-shuai,BO Jing-shan,WU Zhao-ying,et al.Effects of soil parameters on ground surface acceleration peak and response spectra[J].Journal of Seismological Research,2005(2):161–171.(in Chinese))
[8]李小军,彭青.不同类别场地地震动参数的计算分析[J].地震工程与工程振动,2001,21(1):29–36.(LI Xiao-jun,PENG Qing.Calculation and analysis of earthquake ground motion parameters for different site categories[J].Earthquake Engineering and Engineering Vibration,2001,21(1):29–36.(in Chinese))
[9]GB50011—2001建筑抗震设计规范[S].2001.(GB0011—2001Code for seismic design of buildings[S].2001.(in Chinese))
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