土-结构相互作用体系人工边界的动力反应与分析

英文篇名：Dynamic Response and Artificial Boundary Analysis in Soil Structure Interaction System
中文刊名：力学季刊
英文刊名：Chinese Quarterly of Mechanics
作者：方志
英文作者：FANG Zhi1 ; 2(1.Department of Geotechnical engineering ; Tongji University ; Shanghai 200092 ; China ; 2.Halcrow China Limited ; Shanghai 200021 ; China)
中文关键词：人工边界 ; SSI体系 ; 粘弹性 ; 动力分析 ; 有限元法 ; 数值模拟
英文关键词：artificial boundary ; soil structure interaction ; viscous-spring ; dynamic analysis ; finite element method ; numerical simulation
出版日期：2009-09-15
机构：同济大学地下建筑与工程系;合乐中国有限公司;
年：2009
期：03
出版单位：力学季刊

摘要

在结构-地基相互作用(SSI)体系的动力分析中人工边界的模拟与选取是一个关键因素,直接影响SSI体系的动力分析结果。人工边界模拟方法众多,目前对于不同人工边界在各种计算条件下模拟效果的比较研究所见不多。采用数值方法集中比较了工程中广泛应用的几种人工边界在SSI体系分析中的动力反应,详细分析了一维柱体在各种人工边界及输入的冲击荷载及正弦周期荷载作用下的动力分析结果的精确性及稳定性。研究结果表明,人工边界的动力模拟效果与输入震源的动力特性及分析介质的弹性常数存在密切的关系,即较高的输入震源频率需要较高的介质弹性波速,才能保证人工边界的稳定性与适用性。结合上海地区土体及地震波特性,指出本地区SSI体系的动力计算宜采用粘弹性人工边界。
In the dynamic analysis of soil structure interaction(SSI) system,the simulation and selection of artificial boundaries(ABs) are a key factor which determines the dynamic response of SSI system.There are many ABs that can be adopted in SSI analysis,but the studies on the response comparison of different ABs are seldom done at present time.The dynamic responses of several ABs widely applied in the SSI system by numerical method were compared.The numerical precision and stability of the ABs applied on a 1-D column were discussed under impulsive and sine periodic force.The results show that the dynamic effects of ABs have close relations to inputted force dynamic characters and material parameters.According to the characteristics of soil and its seismic waves,the viscous spring boundary was suggested for SSI dynamic analysis in Shanghai.

引文

[1]廖振鹏.工程波动理论导引[M].北京:科学出版社,1996.
    [2]Lysmer J,Kuhlemeyer R L.Finite dynamic model for infinite media[J].Journal of the Engineering Mechanics Division,ASCE,1969,95(1):859-877.
    [3]Deeks A J,Randolph M F.Axisymmetric time-domain transmitting boundaries[J].Journal of the Engineering Mechanics,1994,120(1):25-42.
    [4]刘晶波,吕彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55-64.
    [5]刘晶波,王振宇,张克峰等.考虑土-结构相互作用大型动力机器基础三维有限元分析[J].工程力学,2002,19(3):34-38.
    [6]邱流潮,刘桦,金峰.二维土-结构地震动力相互作用时域有限元分析[J].工程力学,2006,23(9):114-119.
    [7]Wolf J P,Song C.Doubly asymptotic multi-directional transmitting boundary for dynamic unbounded medium structure interaction analy-sis[J].Earthquake Engineering and Structural Dynamics,1995,24(2):175-188.
    [8]Underwood P,Geers T L.Doubly asymptotic boundary element analysis of dynamic soil-structure interaction[J].International Journalof Solids and Structure,1981,17:687-697.
    [9]Keys R G.Absorbing boundary conditions for acoustic media[J].Geophysics,1985,50:892-902.
    [10]Owen D R J,Hinton E.Finite Elements in Plasticity:Theory and Practice[M].Pineridge Press Limited,Swansea,U K,1980.