Özet:

The main aim of this study is to investigate effects of the variation of unit weight of backfill soil on the behavior of a cantilever retaining wall under earthquake effect considering soil-structure interaction. For this purpose, taking into account three different subsoil systems and four different unit weights of the backfill soil, the dynamic analyses of soil-structure model were done in time domain through finite element method. Interface elements were used to consider backfill-cantilever retaining wall interaction in the created model. Radiational damping generated from the infinity of soil medium and wave reflection effects were taken into consideration by using viscous dampers at the soil boundaries. Furthermore, nonlinear behavior of soil material was considered by means of Drucker-Prager failure criterion. The dynamic analyses of the soil-structure model were carried out by using North-South component of the ground motion recorded during August 17, 1999 Kocaeli Earthquake in Yarımca station. Newmark’s direct integration method was used in the analyses. The analysis results were comparatively evaluated in terms of the lateral displacements of the wall and the stresses occurred in the critical sections of the wall. The obtained results showed that soil-structure interaction is an effective parameter on earthquake behavior of the cantilever retaining wall and it must be definitely considered in design process. However, the variation of the unit weight of backfill soil has a negligible effect on seismic response of the wall.

Anahtar Kelimeler: