浅硬场地剪切波速变异性对结构地震输入的影响
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摘要
场地对地面结构地震动力的输入分析有决定性影响。本文用Shake 2000程序计算并讨论了浅硬场地多工况下剪切波速变化对不同周期结构动力响应的影响,主要结论如下:浅硬场地剪切波速测试标准差对地表加速度反应谱的影响很大,影响程度与输入地震动的强度、频率和剪切波速有关;剪切波速测试标准差对地表加速度反应谱的影响在大多数情况下不可忽略;对于不同周期的结构,剪切波速变化对短周期和1s周期的影响程度与地表加速度反应谱峰值略有不同;场地剪切波速减小对反应谱的影响明显大于波速增大时的影响;浅硬场地波速标准差对短周期的影响基本不可忽略,对1 s周期的影响则可以忽略;随地震动强度增加,剪切波速的减小对反应谱短周期的影响程度加大。
The sites have decisive effect on the seismic input of superstructure. This paper applies SHAKE 2000 program and discusses the impact of shear-wave velocity on the different dynamic response of periodic structure in multiple conditions of shallow-hard sites. The main conclusions are as follows: the impact of the shear-wave velocity test standard deviation in the shallow-hard sites is great on the surface acceleration response spectra,and the degree of the influence is related to the intensity and frequency of the input ground motion and the magnitude of the shearwave velocity; taking the peak changes over 20% in the acceleration response spectra as the standard which cannot be ignored,the impact of the shear-wave velocity test standard deviation on the surface acceleration response spectra cannot be ignored in most conditions; in terms of different periodic structures,the effect degree of the changes in shear-wave velocity on the short-period and 1s-period is slightly different from peak acceleration response spectra; the impact of the decrease in the shear-wave velocity is significantly greater than the increase; the impact of velocity standard deviation on short-cycle can't be ignored,the impact on 1s cycle can be ignored; as the intensity of the motion increases,the impact of the decrease in the shear-wave velocity significantly increases.
The sites have decisive effect on the seismic input of superstructure. This paper applies SHAKE 2000 program and discusses the impact of shear-wave velocity on the different dynamic response of periodic structure in multiple conditions of shallow-hard sites. The main conclusions are as follows: the impact of the shear-wave velocity test standard deviation in the shallow-hard sites is great on the surface acceleration response spectra,and the degree of the influence is related to the intensity and frequency of the input ground motion and the magnitude of the shearwave velocity; taking the peak changes over 20% in the acceleration response spectra as the standard which cannot be ignored,the impact of the shear-wave velocity test standard deviation on the surface acceleration response spectra cannot be ignored in most conditions; in terms of different periodic structures,the effect degree of the changes in shear-wave velocity on the short-period and 1s-period is slightly different from peak acceleration response spectra; the impact of the decrease in the shear-wave velocity is significantly greater than the increase; the impact of velocity standard deviation on short-cycle can't be ignored,the impact on 1s cycle can be ignored; as the intensity of the motion increases,the impact of the decrease in the shear-wave velocity significantly increases.
引文
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[2]GB50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB50011-2010 Code for Seismic Design of Buildings[S].Beijing:China Architecture and Building Press,2010.(in Chinese)
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[5]邱志刚,薄景山,罗奇峰.土壤剪切波速与埋深关系的统计分析[J].世界地震工程,2011,27(3):81-88.QIU Zhigang,BO Jingshan,LUO Qifeng.Statistical analysis of relationship between shear wave velocity and depth of soil[J].World Earthquake Engineering,2011,27(3):81-88.(in Chinese)
[6]刘红帅,郑桐,薄景山,等.粘性土剪切波速不确定性的统计分析[J].世界地震工程,2010,26(增刊):99:103.LIU Hongshuai,ZHENG Tong,BO Jingshan,et al.Statistical analysis of uncertainty for shear wave velocities of cohesive soils[J].World Earthquake Engineering,2010,26(supl):99-103.(in Chinese)
[7]王广军,苏经宇.剪切波速度统计结果及其在场地分类中的应用[J].建筑科学,1986,1:69-76.WANG Guangjiu,SU Jingyu.Some statistical analytical results of shear wave velocity and its application in the site classification[J].Building Science,1986,1:69-76.(in Chinese)
[8]高玉峰,刘汉龙.合肥膨胀土剪切波速的特征分析[J].岩土工程学报,2003,25(3):371-373.GAO Yufeng,LIU Hanlong.Study on shear wave velocities in expansive soils of Hefei[J].Chinese Journal of Geotechnical Engineering,2003,25(3):371-373.(in Chinese)
[9]Real,C.R.(1988).Turkey Flat,USA site effects test area:report 2,site characterization[R].Calif.Div.of Mines and Geology Tech.Rept.88-2.
[10]Tomiichi Uetake,Kazuyoshi Kudo.Assessment of site effects on seismic motion in ashigara valley[J].Bulletin of the Seismological Society of America,Japan,2005,95:2297-2317.
[11]Annie O.L.Kwok,Jonathan P.Stewart,and Youssef M.A.Hashash.Nonlinear ground-response analysis of turkey flat shallow stiff-soil site to strong ground motion[J].Bulletin of the Seismological Society of America,2008,98:331-343.
[12]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,2005,28(2):167-171.LIU Hongshuai,BO Jingshan,WU Zhaoying,et al.Effects of soil parameters on ground surface acceleration peak and response spectra[J].Journal of Seismological Research,2005,28(2):167-171.(in Chinese)
[13]李平,薄景山,孙有为.剪切波速差异性对地震反应的影响[J].世界地震工程,2010,26(增刊):133-137.LI Ping,BO Jingshan,SUN Youwei.Shear wave velocity diversity influence on the seismic response[J].World Earthquake Engineering.2010,26(supl):133-137.(in Chinese)
[14]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 Guoxing,LIU Xuezhu,WANG Binghui.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)
[15]高玉峰,刘汉龙,朱伟.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 Yufeng,LIU Hanlong,ZHU Wei.Effect of shear wave velocity on the seismic response of sand ground[J].Geotechnical Investigation&Surveying,2001,1:39-42.(in Chinese)
[16]吕红山,赵凤新.适用于中国场地分类的地震动反应谱放大系数[J].地震学报,2007,29(1):67-77.LHongshan,ZHAO Fengxin.Site coefficients suitable to China site category[J].Acta Seismologica Sinica,2007,29(1):67-77.(in Chinese)
[2]GB50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB50011-2010 Code for Seismic Design of Buildings[S].Beijing:China Architecture and Building Press,2010.(in Chinese)
[3]工程地质手册编委会.工程地质手册[M].4版.北京:中国建筑工业出版社,2007.Engineering geology handbook board.Engineering geology Handbook[M].4thedition.Beijing:China Architecture and Building Press,2007.(in Chinese)
[4]GB50021-2001岩土工程勘察规范[S].北京:中国建筑工业出版社,2001.GB50021-2001 Code for Investigation of Geotechnical Engineering[S].Beijing:China Architecture and Building Press,2001.(in Chinese)
[5]邱志刚,薄景山,罗奇峰.土壤剪切波速与埋深关系的统计分析[J].世界地震工程,2011,27(3):81-88.QIU Zhigang,BO Jingshan,LUO Qifeng.Statistical analysis of relationship between shear wave velocity and depth of soil[J].World Earthquake Engineering,2011,27(3):81-88.(in Chinese)
[6]刘红帅,郑桐,薄景山,等.粘性土剪切波速不确定性的统计分析[J].世界地震工程,2010,26(增刊):99:103.LIU Hongshuai,ZHENG Tong,BO Jingshan,et al.Statistical analysis of uncertainty for shear wave velocities of cohesive soils[J].World Earthquake Engineering,2010,26(supl):99-103.(in Chinese)
[7]王广军,苏经宇.剪切波速度统计结果及其在场地分类中的应用[J].建筑科学,1986,1:69-76.WANG Guangjiu,SU Jingyu.Some statistical analytical results of shear wave velocity and its application in the site classification[J].Building Science,1986,1:69-76.(in Chinese)
[8]高玉峰,刘汉龙.合肥膨胀土剪切波速的特征分析[J].岩土工程学报,2003,25(3):371-373.GAO Yufeng,LIU Hanlong.Study on shear wave velocities in expansive soils of Hefei[J].Chinese Journal of Geotechnical Engineering,2003,25(3):371-373.(in Chinese)
[9]Real,C.R.(1988).Turkey Flat,USA site effects test area:report 2,site characterization[R].Calif.Div.of Mines and Geology Tech.Rept.88-2.
[10]Tomiichi Uetake,Kazuyoshi Kudo.Assessment of site effects on seismic motion in ashigara valley[J].Bulletin of the Seismological Society of America,Japan,2005,95:2297-2317.
[11]Annie O.L.Kwok,Jonathan P.Stewart,and Youssef M.A.Hashash.Nonlinear ground-response analysis of turkey flat shallow stiff-soil site to strong ground motion[J].Bulletin of the Seismological Society of America,2008,98:331-343.
[12]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,2005,28(2):167-171.LIU Hongshuai,BO Jingshan,WU Zhaoying,et al.Effects of soil parameters on ground surface acceleration peak and response spectra[J].Journal of Seismological Research,2005,28(2):167-171.(in Chinese)
[13]李平,薄景山,孙有为.剪切波速差异性对地震反应的影响[J].世界地震工程,2010,26(增刊):133-137.LI Ping,BO Jingshan,SUN Youwei.Shear wave velocity diversity influence on the seismic response[J].World Earthquake Engineering.2010,26(supl):133-137.(in Chinese)
[14]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 Guoxing,LIU Xuezhu,WANG Binghui.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)
[15]高玉峰,刘汉龙,朱伟.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 Yufeng,LIU Hanlong,ZHU Wei.Effect of shear wave velocity on the seismic response of sand ground[J].Geotechnical Investigation&Surveying,2001,1:39-42.(in Chinese)
[16]吕红山,赵凤新.适用于中国场地分类的地震动反应谱放大系数[J].地震学报,2007,29(1):67-77.LHongshan,ZHAO Fengxin.Site coefficients suitable to China site category[J].Acta Seismologica Sinica,2007,29(1):67-77.(in Chinese)
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