不同类型地震波作用下土―结构相互作用体系地震反应分析
|
摘要
目前有关长周期地震波作用下结构的动力响应研究大多限于线弹性问题.本文采用次弹性(Hypoelastic)模型模拟土体的非线性,利用有限元法建立土-结构相互作用体系分析模型.分别从1985年墨西哥地震记录库、2003年日本十胜冲地震记录库中选取具有较可靠长周期信息的基岩地震波作为输入,对土-结构相互作用体系进行非线性地震响应分析,并与普通地震波作用下的动力响应结果进行了比较,结果表明,随基岩输入峰值的增加,地表加速度放大系数呈减小趋势,长周期地震波的场地地表反应波的反应谱值在长周期段有增大趋势,普通地震波不明显.考虑土―结构相互作用影响后,桩基承台的加速度反应波峰值和加速度反应放大系数总体上要小于自由场.
Study on dynamic response under long-period seismic has been mostly focused on linear situation at present.Soil-structure interaction system set up by finite element method with hypoelastic was used to simulate nonlinear behavior of soil.The long-period seismic waves were chosen from the earthquake records of Mexico 1985 and Hokkaido Japan 2003 as input to analysis nonlinear seismic response of soil-structure interaction system,and the result was compared with that of normal seismic waves.The result shows that the acceleration factors at ground surface have a tendency becoming smaller and the spectra of ground wave under long-period rock wave grows bigger while that under normal rock wave hardly change with the maximum of rock acceleration changing bigger.The maximum acceleration and acceleration factors at pile cap are smaller than that of ground face with soil-structure-interaction in consideration.
Study on dynamic response under long-period seismic has been mostly focused on linear situation at present.Soil-structure interaction system set up by finite element method with hypoelastic was used to simulate nonlinear behavior of soil.The long-period seismic waves were chosen from the earthquake records of Mexico 1985 and Hokkaido Japan 2003 as input to analysis nonlinear seismic response of soil-structure interaction system,and the result was compared with that of normal seismic waves.The result shows that the acceleration factors at ground surface have a tendency becoming smaller and the spectra of ground wave under long-period rock wave grows bigger while that under normal rock wave hardly change with the maximum of rock acceleration changing bigger.The maximum acceleration and acceleration factors at pile cap are smaller than that of ground face with soil-structure-interaction in consideration.
引文
[1]谢礼立,周雍年,胡成祥,等.地震动反应谱的长周期特性[J].地震工程与工程振动,1990,10(1):1-20.
[2]胡文凯,陈清军.不同基岩地震波作用下深覆盖场地的反应特征分析[J].结构工程师,2010,Vol.26No.5:85-90.
[3]廖述清,裴星洙,周晓松,等.长周期地震动作用下结构的弹塑性地震反应分析[J].建筑结构,2005,Vol.35No.5:24-27.
[5]马亢.地震作用下桩筏基础与土的动力相互作用机理研究[D].四川:四川大学,2010.
[6]Sun J I,Golesorkhi R,Seed H B.Dynamic Moduli and DampingRatios for Cohesive Soils[R].Report No.EERC88/l5,Earth-quake Engineering Research Center,University of California,Berkeley,l988.
[7]Idriss I M,Sun J I.SHAKE91:A Computer Program for Conduc-ting Equivalent Linear Seismic Response Analyses of HorizontallyLayered Soil Deposits[R]User's Guide,University of California,Davis,California,l992.
[8]Vucetic M,Dobry R.Effect of Soil Plasticity on Cyclic Response[J].Journal of Geotechnical Engineering,ASCE,l99l,117(l):89-l07.
[9]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.
[10]陈清军,杨永胜.随机地震反应分析中侧向边境的影响分析[J].岩土力学,2011,32(11):3442-3447.
[2]胡文凯,陈清军.不同基岩地震波作用下深覆盖场地的反应特征分析[J].结构工程师,2010,Vol.26No.5:85-90.
[3]廖述清,裴星洙,周晓松,等.长周期地震动作用下结构的弹塑性地震反应分析[J].建筑结构,2005,Vol.35No.5:24-27.
[5]马亢.地震作用下桩筏基础与土的动力相互作用机理研究[D].四川:四川大学,2010.
[6]Sun J I,Golesorkhi R,Seed H B.Dynamic Moduli and DampingRatios for Cohesive Soils[R].Report No.EERC88/l5,Earth-quake Engineering Research Center,University of California,Berkeley,l988.
[7]Idriss I M,Sun J I.SHAKE91:A Computer Program for Conduc-ting Equivalent Linear Seismic Response Analyses of HorizontallyLayered Soil Deposits[R]User's Guide,University of California,Davis,California,l992.
[8]Vucetic M,Dobry R.Effect of Soil Plasticity on Cyclic Response[J].Journal of Geotechnical Engineering,ASCE,l99l,117(l):89-l07.
[9]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.
[10]陈清军,杨永胜.随机地震反应分析中侧向边境的影响分析[J].岩土力学,2011,32(11):3442-3447.
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