780N/mm^2級鋼の溶接接合部の疲労強度に関する実験的研究

概要

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In recent years,taller buildings and greater spans have led to an increasing number of fatigue problems from wind load. It is difficult to estimate fatigue life. In this study, 3-point bending fatigue tests of beam-column butt-welded joints were carried out employing 780N/mm^2,and 490N/mm^2 class steels in order to investigate about crack initiation spot and crack growth direction. Two experiments were carried out as follow; 1) the invariable reversed fatigue test, 2) the invariable reversed two step amplitude fatigue test.Main results obtained are summarized as follow; 1) For predicting more exact fatigue life, it is desirabel that fatigue life curves are divided according to their fracture shapes. 2) In case of two step amplitude loading, variable amplitude influences crack propagation rate. The stress concentration factor of welded decreased, and it showed long fatigue life to invariable amplitude loading.
一般社団法人日本建築学会の論文
1995-03-20