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首页> 外文期刊>Journal of Constructional Steel Research >Fatigue life evaluation of welded joints in steel bridge considering residual stress
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Fatigue life evaluation of welded joints in steel bridge considering residual stress

机译：考虑残余应力的钢桥焊接接头疲劳寿命评估

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摘要

Welded joints are widely used to connect structural components in steel truss bridges. Weld residual stresses (WRS) and weld residual stresses relaxation (WRSR) have notable influences on fatigue crack propagation in welded joints, and therefore affect the fatigue life of welded joints. Failing to properly consider the effect of WRS and WRSR in fatigue evaluation may lead to inaccurate results. This study presents a fatigue life prediction model based on the elastic fracture mechanics, with consideration of the WRS and WRSR. The solution for stress intensity factor caused by cyclic loading and WRS is derived. The WRS-induced stress intensity factor is calculated using a weight function technique. Fatigue tests of eight welded joint specimens are implemented, and the fatigue failure analysis of specimens is conducted. The proposed fatigue life prediction model is validated against fatigue test results of welded joints. By considering both WRS and WRSR, the model provides a prediction of fatigue life with a maximum error of 14%. Finally, the validated model is employed to investigate the fatigue life of a real bridge. The fatigue life is underestimated by 17% by considering WRS but not considering WRSR; the fatigue life is overestimated by 49% by neglecting WRS and WRSR. (C) 2018 Elsevier Ltd. All rights reserved.
机译：焊接接头广泛用于连接钢桁架桥梁中的结构部件。焊接残余应力（WRS）和焊接残余应力松弛（WRSR）对焊接接头的疲劳裂纹扩展有显着影响，因此影响焊接接头的疲劳寿命。在疲劳评估中未能正确考虑WRS和WRSR的影响可能会导致结果不准确。这项研究提出了一种基于弹性断裂力学的疲劳寿命预测模型，其中考虑了WRS和WRSR。推导了循环荷载和WRS引起的应力强度因子的解。使用权重函数技术计算WRS引起的应力强度因子。对八个焊接接头试样进行疲劳测试，并对试样进行疲劳破坏分析。针对焊接接头的疲劳测试结果验证了所提出的疲劳寿命预测模型。通过同时考虑WRS和WRSR，该模型可以预测疲劳寿命，最大误差为14％。最后，使用经过验证的模型来研究真实桥梁的疲劳寿命。考虑WRS但不考虑WRSR，疲劳寿命被低估了17％；忽略WRS和WRSR，疲劳寿命被高估了49％。 （C）2018 Elsevier Ltd.保留所有权利。

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