既損傷円形鋼製橋脚の補修に関する研究

Abstract

This paper describes about experiment and numerical analysis to investigate an elasto-plastic behavior and to evaluate for repaired circular steel piers. Hyogoken-nanbu earthquake in 1995, many studies about strength and ductility of circular steel piers has been conducted. However, the repair method of damaged circular steel piers which have buckling and/or crack, is not standardized. It is not also specifically how much the reaction force has remained for damaged circular steel piers. In this study, the repair method is proposed that is early retrofit for damaged circular steel pier after several earthquakes. And five test pieces which have elephant foot bulge damage in the bottom of columns are repaired. Additionally, cyclic loading tests are performed which is same as previous tests. Moreover, it is important to evaluate exact remain reaction force for a circular steel pier, in order to investigate the damage levels and the necessity of repair. Therefore, remain reaction force is evaluated using FEM analysis. It is shown that, the fimdamental data about the repair method of the circular steel pier.