島田 侑子

In the field of energy-based seismic design, it is necessary to evaluate the plastic energy dissipation capacity of steel members. The material characteristics, structural details and loading history are the three principal factors that affect the plastic deformation capacity of members. Among them, loading history is known as the most definitive factor, which is the main objective of this research. The load-deformation relation of steel members under cyclic loading can be divided into three parts: skeleton curve, Bauschinger part and elastic unloading part. Plastic energy dissipation derived from the skeleton part is commonly used to evaluate the energy dissipation capacity of steel member. Cyclic loading tests of steel beam-to-column connections were performed; different loading histories including incremental, decremental and constant amplitude loading were applied in order to clarify the influence of loading history on the plastic energy dissipation capacity of steel members.