A COMPARATIVE STUDY ON SEISMIC BEHAVIOR OF TWOADAPTIVE SLIDING ISOLATORS

The seismic response of conventional friction pendulum isolators (FPS) can lead to resonancephenomenon due to their constant isolation frequency. Recent studies have explored the incorporationof passive adaptability to mitigate this issue. Two types of adaptive sliding isolators, VariableCurvature Friction Pendulum System (VCFPS) and Variable Friction Pendulum System (VFPS) fromthe variable-curvature and variable-friction isolator groups with passive adaptability, respectively,were numerically simulated and compared in this study. The study utilized a velocity-dependentcoefficient of friction and modified viscoplasticity model to simulate the non-linear friction force ofthe isolators in a ۲-DOF idealized shear building. The results show that VCFPS effectively controlstransmitted acceleration to the superstructure and mitigates resonance in frequency response. On theother hand, VFPS is successful in reducing base displacement but does not perform well in controllingsuper-structural acceleration and mitigating resonance. Overall, VCFPS demonstrates betterperformance than VFPS.

Keywords:

Variable Curvature , Variable Frequency , Variable Friction , Friction Pendulum System