Abstract
In this study response of local strain at the end of the beam is obtained by dynamic analysis of multi-storied frames, and the following conclusions are obtained. 1) When standard mechanical properties for SS-41 steel is used, 32, 26 and 24 as a maximum strain ductility factor are obtained for 4, 8 and 12-storied frames. And it is possible that maximum strain ductility factor become much larger, when κ is greater than 0.35. 2) Damage Factor for low cycle fatigue for a severe earthquake is obtained based on eqs. (1) and (2), which is less than design standard value 0.5 proposed by Dr. Kanata et. al. But, safety of the beam end against a severe earthquake should be judged after enough information about low cycle fatigue characteristics is accumulated. 3) A method of predicting strain ductility factor at the end of the beam from design story ductility factor is proposed.
