低温环境的Q500qENH耐候钢桥面板易损焊接节点疲劳寿命预测

张栋元; 兰涛; 张晓巍; 秦广冲; 李然; 刘鑫; 李茂贝

doi:10.3724/j.gyjzG25061801

低温环境的Q500qENH耐候钢桥面板易损焊接节点疲劳寿命预测

doi: 10.3724/j.gyjzG25061801

张栋元¹,
兰涛^1,2, ,,
张晓巍²,
秦广冲²,
李然²,
刘鑫²,
李茂贝³

1. 西南交通大学土木工程学院, 成都 610031;
2. 中国船舶集团国际工程有限公司, 北京 100121;
3. 中国能源建设集团陕西省电力设计院有限公司, 西安 710054

基金项目:

“十四五”国家重点研发计划（2022YFB3706400）。

详细信息

作者简介:
张栋元，硕士研究生，主要从事钢结构研究。

通讯作者:
兰涛，博士，研究员，主要从事钢结构研究，qd_lantao@163.com。

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- 被引次数: 0
出版历程
- 收稿日期: 2025-06-18
- 网络出版日期: 2025-11-05

Fatigue Life Prediction of Vulnerable Welded Joints in Q500qENH Weathering Steel Bridge Deck in Low-Temperature Environment

1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. CSSC International Engineering Co., Ltd., Beijing 100121, China;
3. China Energy Egnineering Group Shaanxi Electric Power Design Institute, Xi'an 710054, China

摘要

摘要: 为准确评估低温环境、车载多因素耦合作用下耐候钢桥面板焊接节点的疲劳性能，对Q500qENH耐候钢试件进行多温度工况下的拉伸试验和疲劳裂纹扩展试验，并结合有限元模拟对试件裂纹扩展行为进行验证。通过构建正交异性钢桥面板有限元模型，对易损焊接节点多恒定温度工况下疲劳裂纹扩展行为进行对比分析，并基于该模型进行易损焊接节点变温工况疲劳寿命预测。结果表明：Q500qENH耐候钢低温下屈服强度和抗拉强度显著提高，疲劳裂纹扩展速率显著减小；疲劳试验和仿真结果吻合良好，验证了模型的有效性；易损焊接节点寿命均随温度升高而降低，顶板焊趾节点的疲劳性能较差，纵肋对接节点的疲劳寿命更长；低平均温度可有效延缓桥面板顶板焊趾裂纹扩展，提升疲劳寿命。
- 正交异性桥面板 /
- 疲劳裂纹扩展 /
- 环境温度 /
- 疲劳寿命预测
Abstract: To accurately evaluate the fatigue performance of welded joints in weathering steel bridge decks under the coupling effect of low-temperature environment and multiple vehicle-borne factors， this paper conducted tensile tests and fatigue crack propagation tests on Q500qENH weathering steel specimens under multi-temperature conditions. To verify the test results， corresponding finite element simulations of fatigue crack propagation in the specimens were performed. An orthotropic steel bridge deck finite element model was established to conduct a comparative analysis of the fatigue crack propagation behavior of vulnerable welded joints under multiple constant temperature conditions. Based on this model， the fatigue life prediction of vulnerable welded joints under variable temperature conditions was carried out. The results showed that： the yield strength and tensile strength of Q500qENH weathering steel significantly increased at low temperatures， while the fatigue crack propagation rate significantly decreased； the fatigue life test result fit well with the simulation result， indicating the effectiveness of the test data； the life of vulnerable welded joints decreased with the increase of temperature， the fatigue performance of the top plate weld toe joints was poor， and the longitudinal rib butt joints had a longer fatigue life； low average temperature can effectively delay the crack propagation of the top plate weld toe of the bridge deck and improve the fatigue life.
- orthotropic bridge deck /
- fatigue crack propagation /
- ambient temperature /
- fatigue life prediction

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参考文献(13)

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