Investigating the Displacement of a Structure Equipped with Rotational Friction Damper: Considering the Structure-soil Interaction Effect

In this research, the effect of soil and structure interaction is investigated in a structure equipped with rotational friction dampers, with several earthquake records and two types of soil. It was modeled in SAP 2000 software and analyzed under the nonlinear dynamic analysis of the time history with the records of the San Fernando, Northridge, and Imperial Valley earthquakes. The used soil was considered relatively "hard" and relatively "soft" soil based on two types of two and three soil groups based on the 2800 regulation. In this research, the soil and structure complex was subjected to the effect of three earthquake records, and after the vibration, the parameter, and the lateral displacement on the desired structure were investigated. Based on the obtained results, it can be said that the displacements in the structure with the damper have been significantly reduced and also the soil interaction effect is minor in type two or hard soils, while the analysis with the interaction effect in a soft soil It has a significant effect on the displacement of the structure, also the rotational friction dampers were able to reduce the displacement of floors and drift in both types of soil. For this reason, the structure was analyzed in two different soil types with damper and with interaction effect, with damper and without interaction effect, without damper and with interaction effect and without damper and interaction effect, in general, it can be said in soft soil. Damping of the soil has a significant role in reducing the forces and deformations of the frame. The effect of the interaction between the soil and the structure in the structures whose underlying soil is soft should be subjected to nonlinear dynamic analysis.