Nowadays, shear walls are used as efficient structural systems for resisting against external lateral loads such as wind and earthquake loads. Regarding to this fact that the pervious studies on the behavior of shear wall systems were performed without considering the effect of foundation and interaction between soil and structure, it seems necessary to conduct some research in the evaluation of shear walls dynamic behavior rested on flexible foundation and with considering the effect of soilstructure interaction.
The linear modeling of a shear wall rested on flexible foundation is conducted which is accompanied with the modeling of soil by Winkler `s springs under foundation. The dynamic behavior of shear wall system is assessed. The results obtained show that depending on types of soils under foundation, the values of displacements are more than displacements when the flexibility of foundation is ignored. Also the internal forces at the base of shear walls and the periods of the first three modes of the structure have significant differences between two cases. In one case the interaction of soil-structure is ignored and on the other one the interaction is considered.