上海软土场地三维非线性地震反应分析
|
摘要
考虑土的非线性,采用弹塑性边界面模型,对上海软土场地进行三维地震反应分析。利用多维地震动作用下的水平地层弹塑性动力反应分析程序,以具有水平和垂直三向完整加速度记录的Taft波作为地震输入,对比分析单向和多向地震输入场地水平和竖向地震反应特征,并分析不同强度地震动输入下竖向和水平加速度峰值比特征及地下水位变化对场地土层地震反应特征的影响。计算分析表明,竖向与水平向地震反应特征有较大差异;与水平单向地震输入相比,三向地震输入场地土层放大效应明显增大;地下水位上升对水平向和竖向峰值加速度的放大效应影响差异显著,地下水位上升,地表水平峰值加速度放大效应增大,竖向峰值加速度放大效应减小,研究结果对上海地区的工程抗震设计具有参考作用。
Reduced order bounding surface model was employed to study 3-D seismic ground response of site considering the nonlinearity of soft soils in Shanghai.A nonlinear procedure for response analysis of horizontal layered sites subjected to multidirectional earthquake loading was used to study vertical and horizontal ground responses,respectively,under unidirectional and multidirectional base excitations(Taft).Also,the development of ratio of vertical and horizontal peak acceleration and the effects of the variation of groundwater table on the characteristics of seismic responses were studied.The study results show that the characteristics of vertical seismic ground response are much different from those of horizontal seismic ground response;the amplification effect is greatly increased under multidirectional base excitations compared with that under unidirectional base excitations;greatly difference is induced by the rise of groundwater table between vertical and horizontal seismic response,as result of the rise of groundwater table,seismic amplification effect at ground surface increases in horizontal direction,but decreases in vertical direction,which are important for geotechnical engineering aseismic design in Shanghai region.
Reduced order bounding surface model was employed to study 3-D seismic ground response of site considering the nonlinearity of soft soils in Shanghai.A nonlinear procedure for response analysis of horizontal layered sites subjected to multidirectional earthquake loading was used to study vertical and horizontal ground responses,respectively,under unidirectional and multidirectional base excitations(Taft).Also,the development of ratio of vertical and horizontal peak acceleration and the effects of the variation of groundwater table on the characteristics of seismic responses were studied.The study results show that the characteristics of vertical seismic ground response are much different from those of horizontal seismic ground response;the amplification effect is greatly increased under multidirectional base excitations compared with that under unidirectional base excitations;greatly difference is induced by the rise of groundwater table between vertical and horizontal seismic response,as result of the rise of groundwater table,seismic amplification effect at ground surface increases in horizontal direction,but decreases in vertical direction,which are important for geotechnical engineering aseismic design in Shanghai region.
引文
[1]齐文浩,薄景山.土层地震反应等效线性化方法综述[J].世界地震工程,2007,23(4):221-226.QI Wen-hao,BO Jing-shan.Summarization on equivalent linear method of seismic responses for soil layers[J].World Earthquake Engineering,2007,23(4):221-226.
[2]YANG J,YAN X R.Site response to multi-directional earthquake loading:a practical procedure[J].Soil Dynamics and Earthquake Engineering,2009,29(4):710-721.
[3]王志良,韩清宇.黏弹塑性土层地震反应的波动分析方法[J].地震工程与工程震动,1981,1(1):117-137.WANG Zhi-liang,HAN Qing-yu.Analysis of wave propagation for the site seismic response,using the viscoelastoplastic model[J].Earthquake Engineering and Engineering Vibration,1981,1(1):117-137.
[4]栾茂田,邵字.土体地震反应非线性分析方法比较研究[C]//第五届全国土动力学学术会议论文集.大连:大连理工大学出版社,1998:203-209.
[5]吴世明.土动力学[M].北京:中国建筑工业出版社,2000.
[6]李小军.黏弹塑性模型及土层地震反应分析[D].哈尔滨:国家地震局工程力学研究所,1987.
[7]戚承志,钱七虎.核电站抗震研究综述[J].地震工程与工程振动,2000,20(3):76-86.QI Cheng-zhi,QIAN Qi-hu.Overview of seismic research for nuclear power plant[J].Earthquake Engineering and Engineering Vibration,2000,20(3):76-86.
[8]YOSHIDA N,KOBAYASHI S,SUETOMI I,et al.Equivalent linear method considering frequency dependent characteristics of stiffness and damping[J].Soil Dynamic and Earthquake Engineering,2002,22(3):205-222.
[9]陈继华,陈国兴,王伟.长江下游地区深厚软弱场地地震效应分析[J].世界地震工程,2009,25(1):117-121.CHEN Ji-hua,CHEN Guo-xing,WANG Wei.Analysis of seismic effect on sites with deep and soft soils in the lower reaches of the Yangtze River[J].World Earthquake Engineering,2009,25(1):117-121.
[10]黄雨,叶为民,唐益群,等.上海软土场地的地震反应特征分析[J].地下空间与工程学报,2005,1(5):773-778.HUANG Yu,YE Wei-ming,TANG Yi-qun,et al.Characteristic analysis for seismic ground response of soft soils in Shanghai[J].Chinese Journal of Underground Space and Engineering,2005,1(5):773-778.
[11]胡聿贤.地震工程学[M].北京:地震出版社,1998.
[12]YANG J,YAN X R.Factors affecting site response to multi-directional earthquake loading[J].Engineering Geology,2009,107(3-4):77-87.
[13]蔡宏英,周健,李相菘.上海厚覆盖软土地层动力反应分析[C]//第五届全国土动力学学术会议论文集.大连:大连理工大学出版社,1998:284-288.
[14]DAFALIAS Y F,HERRMANN L R.Bounding surface formulation of soil plasticity[C]//Soil Mechanics-Transient and Cyclic Loads.New York:John Wiley and Sons Ltd.,1982:253-282.
[15]DAFALIAS Y F.Bounding surface plasticity I:mathematical foundation and hypo-plasticity[J].Journal of Engineering Mechanics,ASCE,1986,112(9):966-987.
[16]WANG Z L,DAFALIAS Y F,SHEN C K.Bounding surface hypo-plasticity model for sand[J].Journal of Engineering Mechanics,1990,116(5):983-1001.
[17]LI X S,WANG Z L,SHEN C K.A nonlinear procedure for response analysis of horizontally layered sites subjected to multidirectional earthquake loading[R].Davis:Report to the Department of Civil Engineering,University of California,1992.
[18]中华人民共和国建设部.GB50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[2]YANG J,YAN X R.Site response to multi-directional earthquake loading:a practical procedure[J].Soil Dynamics and Earthquake Engineering,2009,29(4):710-721.
[3]王志良,韩清宇.黏弹塑性土层地震反应的波动分析方法[J].地震工程与工程震动,1981,1(1):117-137.WANG Zhi-liang,HAN Qing-yu.Analysis of wave propagation for the site seismic response,using the viscoelastoplastic model[J].Earthquake Engineering and Engineering Vibration,1981,1(1):117-137.
[4]栾茂田,邵字.土体地震反应非线性分析方法比较研究[C]//第五届全国土动力学学术会议论文集.大连:大连理工大学出版社,1998:203-209.
[5]吴世明.土动力学[M].北京:中国建筑工业出版社,2000.
[6]李小军.黏弹塑性模型及土层地震反应分析[D].哈尔滨:国家地震局工程力学研究所,1987.
[7]戚承志,钱七虎.核电站抗震研究综述[J].地震工程与工程振动,2000,20(3):76-86.QI Cheng-zhi,QIAN Qi-hu.Overview of seismic research for nuclear power plant[J].Earthquake Engineering and Engineering Vibration,2000,20(3):76-86.
[8]YOSHIDA N,KOBAYASHI S,SUETOMI I,et al.Equivalent linear method considering frequency dependent characteristics of stiffness and damping[J].Soil Dynamic and Earthquake Engineering,2002,22(3):205-222.
[9]陈继华,陈国兴,王伟.长江下游地区深厚软弱场地地震效应分析[J].世界地震工程,2009,25(1):117-121.CHEN Ji-hua,CHEN Guo-xing,WANG Wei.Analysis of seismic effect on sites with deep and soft soils in the lower reaches of the Yangtze River[J].World Earthquake Engineering,2009,25(1):117-121.
[10]黄雨,叶为民,唐益群,等.上海软土场地的地震反应特征分析[J].地下空间与工程学报,2005,1(5):773-778.HUANG Yu,YE Wei-ming,TANG Yi-qun,et al.Characteristic analysis for seismic ground response of soft soils in Shanghai[J].Chinese Journal of Underground Space and Engineering,2005,1(5):773-778.
[11]胡聿贤.地震工程学[M].北京:地震出版社,1998.
[12]YANG J,YAN X R.Factors affecting site response to multi-directional earthquake loading[J].Engineering Geology,2009,107(3-4):77-87.
[13]蔡宏英,周健,李相菘.上海厚覆盖软土地层动力反应分析[C]//第五届全国土动力学学术会议论文集.大连:大连理工大学出版社,1998:284-288.
[14]DAFALIAS Y F,HERRMANN L R.Bounding surface formulation of soil plasticity[C]//Soil Mechanics-Transient and Cyclic Loads.New York:John Wiley and Sons Ltd.,1982:253-282.
[15]DAFALIAS Y F.Bounding surface plasticity I:mathematical foundation and hypo-plasticity[J].Journal of Engineering Mechanics,ASCE,1986,112(9):966-987.
[16]WANG Z L,DAFALIAS Y F,SHEN C K.Bounding surface hypo-plasticity model for sand[J].Journal of Engineering Mechanics,1990,116(5):983-1001.
[17]LI X S,WANG Z L,SHEN C K.A nonlinear procedure for response analysis of horizontally layered sites subjected to multidirectional earthquake loading[R].Davis:Report to the Department of Civil Engineering,University of California,1992.
[18]中华人民共和国建设部.GB50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心