초록 close

This paper presents the results of three phases of fatigue tests for the fatigue strength of in-plane welded gusset joints which are most common details inevitably existed in the region of high stress range. Totally fifty seven fatigue specimens with various thickness and strengths were made and the tensile fatigue tests were performed. One full scale beam fatigue tests was also carried out. The validity of the fatigue strengths of those details in specification was proved and the effects of thickness of flanges and welded attachments, length of attachments and the strength of applied steel were examined. The characteristics of crack initiation and propagation were also observed. The test results are evaluated by comparing with other test data and the fatigue criteria of other countries. In order to find out the degree of stress concentration in the weld toe depending on geometric configuration such as the attachment length and transition radius, analytical works were also carried out. Comparing with present specification, analytical results indicate that there are need of revising and subdividing the detail categories.