International Institute of Earthquake Engineering and Seismology Journal of Seismology and Earthquake Engineering 1735-1669 Articles in Press 2024 08 28 Investigating the effect of steel ring damper on the seismic performance of concrete frames by numerical method 715379 10.48303/jsee.2024.2018297.1084 EN Kambiz Cheraghi kermanshaDepartment of Civil Engineering, Razi University, Kermanshah, Iran. Hamed Mahdiani Department of Civil Engineering, Islamic Azad University, Kermanshah, Iran. Omid Rezaeichaghabalaki Department of Civil Engineering, Razi University, Kermanshah, Iran. Mohammad Hadi Tavana Department of Civil Engineering, Islamic Azad University, Kermanshah, Iran. Journal Article 2023 12 20 Steel ring dampers are a type of yielding dampers that have a good energy dissipation capability. In this research, parametric studies were conducted to investigate the influence of the radius and thickness of the steel ring damper (SRD) on the seismic behavior of the RC frame. The numerical model was first calibrated with two experimental samples, then the impact of the damper on the concrete frame was investigated by performing pushover analysis. Simplified two-line curves were then obtained to calculate the seismic parameters of the frame, including stiffness, strength, ductility, and energy dissipation parameters. To estimate the elastic stiffness and ultimate strength of the concrete frame equipped with SRD, approximate equations were presented that were in good agreement with the numerical results. Finally, the most influential variables on the results were also identified. The results showed that reducing the radius of the damper and increasing its thickness increases the stiffness and strength of the frame. Also, increasing the thickness of the damper increases the energy dissipation and reduces the ductility of the frame. It was also observed that if the stiffness ratio of the damper to the bare frame is set to 4.1, the energy dissipation and ductility of the RC frame will be 2 times that of the bare frame.