FATIGUE CRACK PROPAGATION AND STRENGTH OF WEB-GUSSET WELDED JOINTS UNDER VARIED PRINCIPAL STRESS DIRECTION
FATIGUE CRACK PROPAGATION AND STRENGTH OF WEB-GUSSET WELDED JOINTS UNDER VARIED PRINCIPAL STRESS DIRECTION
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DOI：
10.2208/journalofjsce.3.1_128
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
T. Mori;S. Hirayama
中科院分区：
文献类型：
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作者：
T. Mori;S. Hirayama
钢梁桥主梁腹板与腹板焊接接头的主应力方向发生瞬时变化，当车辆从主梁腹板上方通过时，剪应力方向发生反转。众所周知，疲劳裂纹沿与主应力方向垂直的方向萌生和扩展，但疲劳裂纹扩展行为和疲劳强度随主应力方向变化的研究尚不多见。为了确定主应力方向变化的应力场中的疲劳扩展行为和疲劳强度，进行了主梁试件的疲劳试验和疲劳裂纹扩展分析。
The direction of the principal stress on web-gusset welded joint connected to a main girder web of steel girder bridges changes instantaneously so that the direction of shear stress reverses when a vehicle passes right above there. It is well known that the fatigue crack initiates and propagates in the direction perpendicular to the principal stress one, but fatigue crack propagation behavior and fatigue strength when the direction of principal stress changes have not been studied yet. In this study, to determine the propagation behavior and the fatigue strength in the stress field where the direction of the principal stress changes, fatigue tests on girder specimens and fatigue crack propagation analyses have been performed.