【摘要】 粘弹性人工边界不仅在时间上是局部的,而且在空间上也是局部的,这种边界物理意义清晰、简单有效,且易于在有限元法中得以实现,与之相对于的地震动输入则是通过在边界上施加等效节点力实现的,等效节点力的大小与入射地震波波速成正比。本文利用通用有限元软件提供的弹簧阻尼单元模拟粘弹性边界,介绍了土—地下结构开放系统人工边界及地震动输入的应用方法,并进行了精度验证。结果表明,该方法具有较高的精度,可以方便的应用于波动问题的模拟分析,能够有效的分析地震作用下地下结构的动力反应。更多还原

【Abstract】 The visco-elastic artificial boundary is local both in time and space.Such boundary is simple but efficient,and it can be implemented in finite element method without difficulty.The seismic input is realized at the artificial boundary by loading a set of nodal equivalent forces,proportional to the velocity of the incident seismic wave.In this paper,the method of simulating visco-elastic boundary by means of spring-damping element of general finite element software is used to introduce artificial boundary and seismic input for open soil-underground structure system.The results show that the method has high precision and can be used to analyze the wave motion problem easily.So the method is an effective approach to get the dynamic response of the open soil-underground structure under earthquake.更多还原