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.
出处
《力学季刊》
CSCD
北大核心
2009年第3期475-480,共6页
Chinese Quarterly of Mechanics
基金
上海市重点学科(结构工程)建设资助项目
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
artificial boundary
soil structure interaction
viscous-spring
dynamic analysis
finite element method
numerical simulation
