EXTREMELY LOW CYCLE FATIGUE EXTREMELY LOW CYCLE FATIGUE CANTILEVER STEEL COLUMNS

摘要

This paper presents the results of un-stiffened cantilever column subjected to incremental or constantnamplitude cyclic loading. The objectives of this study are to investigate the extremely low cycle fatigue lifenof the column and verify the proposed strain based approach. During the test, fatigue cracks initiated fromnthe weld toe at the corner and propagated along the weld toe. Finally, the column ruptured without a localnbuckling. The failure of low cycle fatigue induced by large cyclic deformation has been elucidated. In anfurther step, the crack initiation life was estimated based on the local strain by proposed simple approach. Itnis indicated that correlation between the test result and the estimated life was good enough.