Effect of Friction Pendulum System Isolators with Different Radius of Curvature and Friction Coefficient on Building Earthquake Performance

This study analyzes the effect of base isolation with single concave friction pendulum systems (FPS) on the seismic response of a five-story reinforced concrete building. It aims to methodically understand how different isolation parameter values (radius of curvature at 2 m, 3 m, and 4 m) and coefficients of friction (0.03, 0.055, and 0.096) affect structural response in each of five configurations. In terms of the Turkish Building Earthquake Code (TBDY, 2019), five structural models were created, and each was analyzed using nonlinear time history analysis for two major earthquakes: Northridge Earthquake (1994, Mw 6.7) and 2023 Kahramanmaraş-Pazarcık (Mw 7.7). Relevant response criteria were evaluated, including structural response parameters such

as base shear, maximum peak displacement, peak floor acceleration, force-displacement hysteresis, and natural vibration periods. The reduction of seismic response of delta frame structures isolated with FPS is more than 55% in base shear, 69% in peak displacement, and 35% in floor acceleration. Additionally, the use of isolators increased the fundamental period of the structure by approximately 40%, which reflects their ability to improve the earthquake resistance of the structure.

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