STATIONARY AND TRANSIENT DYNAMIC VERTICAL RESPONSES OF STRUCTURES INTERACTING WITH DISTINCT SOIL-FOUNDATION ARRENGEMENTS USING CORRECTED STRUCTURAL MODAL DATA

Resumo

This work investigates stationary and transient vertical response of multidegree of freedom
structures interacting with different soil profiles through an extended modal analysis procedure. The
methodology was originally proposed by Wu and Smith [1] to analyze the dynamic behavior of
structures subjected to an incident wave fields. The present article revisits the previously mentioned
article and expand it to consider external force excitations acting upon the structure. The original
formulation considered the soil as a homogeneous half-space. In the present article, the response of
structures supported by the half-space, layered soil profiles and also by piled structures is addressed.
The stationary soil and pile response were synthetized through Boundary Element Method. The main
characteristic of the method stated in this work is to modify the modal original parameters of the
structure in other to incorporate in these parameters the dynamic response of the soil-foundation
arrangements. Numerical studies will address the quantity of modified structural modes necessary to
describe, with certain precision, the transient response of structure as a function of the soil-foundation

supporting scheme. The numerical examples presented will also investigate the role of the soil-
foundation system properties, like foundation mass, pile mass, density and length and the soil profile

(half-space, layered) on the structural response. The methodology used in this work will allow to
determine the transient response of multidegree of freedom structures interacting with several soil
profiles with a low computational cost compared to concurrent methodologies.