基础动力分析的一种简化方法

提出一种能用于无限域地基动、静力有限元分析的简单人工边界-粘弹边界,采用一层边界单元来实现.该边界弹簧部分采用弹性半空间Mindlin解计算,边界单元采用具有粘性阻尼的粘弹材料,通过确定合理的弹性模量、泊松比和粘性阻尼系数,不仅可以使边界单元能够模拟无限域远场的弹性恢复力,同时可以模拟粘性边界.通过两个算例分析,验证了该边界的有效性和实用性,可用于土-结构动力相互作用分析.

A Simplified Method For Foundation Dynamic Analysis in Infinite Medium

The paper presents a viscoeplastic boundary for infinite medium using a finife element method,which can be applied to both static and dynamic foundation problems.The boundary can be realized by using special boundary elements.The spring part of this boundary can be determined by Mindlin equations,and frequency dependent viscous material(resistance proportional to velocity) is introduced into the boundary elements to simulate dashpots of the viscous boundary.When choosing appropriate parameters of Young's modulus,Poisson's ratio and material damping ratio,these boundary elements can simulate not only the elasticity recovery capacity of the far field media,but also the radiation damping.Two case studies justify the validity and practicability of this simplified boundary,which proves that it is applicable to the dynamic soil-structure interaction analysis.