Abstract:
The primary purpose of this study is to investigate stochastic responses of a cable-stayed
bridge which is built on the Mississippi River in 1987 in USA, subjected to the spatially varying
earthquake ground motion by using the finite element method taking account of soil-structure
interaction (SSI) effects. The bridge is modelled as a two- dimensional to determine the
stochastic response of the bridge. Spatially varying earthquake ground motions is considered in
the analysis. Depending upon the earthquake motion, the response values of the bridge founded
on firm, medium and soft soil strata are obtained, separately. The effects of soil–structure
interaction on the stochastic response of the cable-stayed bridge are investigated including
foundation as a vertical pile groups. The soil–pile interaction is linearly idealized as an upright
beam on the Winkler foundation model. Results indicate that taking into account soil-structure
interaction could increase element forces and displacement of bridge along the deck and height
of tower especially in case of soft foundation soil strata.
