非定型 構造物의 비틀림 저감을 위한 摩擦振子시스템의 適用

The purpose of this study is to investigate the applicability of Friction Pendulum System (FPS) to reduce the torsional behavior of asymmetric structures subjected to earthquake loading. To achieve this goal, an one bay-three story shear building was selected. The distribution of floor masses was varied to obtain different eccentricities between mass center and rigidity center of the shear building. The analytical study shows that during earthquake loading, the twisting deformation of the irregular structures can be minimized by applying seismic isolators, especially FPS, regardless of the mass eccentricity ratio of the structure. To investigate the possibility of application of the FPS to the real irregular structures, an irregular shaped residential-commercial building was selected and an earthquake analysis was conducted. FPS was located either between commercial area and footings or between residential area and transfer girders. Analytical results show that because the rigidity center of the FPS is automatically coincident with the mass center, the good structural performance can be expected by using FPS for torsionally vulnerable structures.