The friction pendulum system(FPS) is a kind of seismic isolation devices for isolating structures from an earthquake. To analyze the effect of friction materials used in the friction pendulum system, fragility analysis of LNG tank with seismic isolation system was conducted. In this study, titanium dioxide(TiO2) nanoparticles were incorporated into polyvinylidene fluoride(PVDF) matrix to produce friction materials attached to the FPS. The base moment of the concrete outer tank and the acceleration of the structure were evaluated from different mixing ratios of constituents for the friction materials. The seismic fragility curves were developed based on two types of limit state. It is confirmed that evaluation of combined fragility curves with several limit states can be applied to select the optimum friction material satisfying the required performance of the FPS for various infrastructure.

• 문지훈(연세대학교 토목환경공학과) | Ji-Hoon Moon (Department of Civil & Environmental Engineering, Yonsei University, Seoul, 03722, Korea)
• 김지수(연세대학교 토목환경공학과) | Ji-Su Kim (Department of Civil & Environmental Engineering, Yonsei University, Seoul, 03722, Korea)
• 이태형(건국대학교 인프라시스템공학과) | Tae-Hyung Lee (Department of Civil Engineering, Konkuk University, Seoul, 05029, Korea)
• 한동석(연세대학교 토목환경공학과) | Tong-Seok Han (Department of Civil & Environmental Engineering, Yonsei University, Seoul, 03722, Korea) Corresponding author