【摘要】 为更好的利用大型通用软件进行结构-地基动力相互作用分析,本文在黏性边界的基础上提出黏性边界单元的概念,通过构造相同阻尼矩阵的方式提出了能够实现黏性边界功效的特殊有限单元-等效黏性边界单元。等效黏性边界单元能够较好的模拟地基的辐射阻尼效应,使黏性边界的实现更加方便。同时,为简化大型通用软件中地震波的输入,提出了适合于黏性边界条件下水平成层地基中垂直入射地震波的输入方法。该方法不需要借助其它辅助计算就可直接在各种大型通用有限元软件中用一个数值模型实现地震波动输入,具有很强的通用性。此输入方法极大的减少了地震波动输入的数据准备工作,降低了操作的复杂程度。数值算例表明,等效黏性边界单元及文中提出的地震波动输入是简单可靠的。更多还原

【Abstract】 On the basis of viscous artificial boundary,the concept of viscous boundary element is put forward.By constructing the same damping matrix,one special kind of element named equivalent viscous boundary element which can implement the function of viscous boundary is proposed.This element does well in simulating the radiation damping effect of soil foundation and makes the implementation of viscous artificial boundary easily.Meanwhile,a method suitable for vertically incident seismic wave motion input in layered soil is presented to simplify the seismic wave motion input in large general commercial finite element software.With this method,wave input can be processed directly in different kinds of software by means of one numerical model without assistance from any other professional program.Time spent on data preparation is greatly reduced and the complexity of wave input operation procedure is simplified.The effectiveness and reliability of the proposed equivalent viscous boundary element and wave motion input method are verified by numerical examples.更多还原