Dynamic Response of Structures in Layered Soils.

摘要

The dynamic response of a strip footing resting on or embedded in a soil stratum is studied. The cases investigated cover the excitation of the footing by horizontal forces and rocking moments,and the motion due to a specified displacement at bedrock. The study is based on an extension of a method originally developed by G. Waas. It is a finite element formulation,with appropriate energy absorbing boundaries,which consist of semi-infinite layered regions extending to the left and right of the finite element region. The effect of layer thickness and the convergence towards the half-space solution are investigated first. The effect of embedment is then considered,comparing the response of an embedded footing to that of the same footing at the surface. The interaction between adjacent footings is finally studied. The results obtained suggest that some of the effects studied might be reasonably well reproduced by applying simple correction factors to the half-space solution.