| 纵肋与顶板新型双面焊构造细节的疲劳强度问题 |
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| 引用本文： | 张清华,笪乐天,李俊,王康臣,袁道云,崔闯,卜一之.纵肋与顶板新型双面焊构造细节的疲劳强度问题[J].中国公路学报,2022,35(8):162-174. |
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| 作者姓名： | 张清华 笪乐天 李俊 王康臣 袁道云 崔闯 卜一之 |
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| 作者单位： | 1. 西南交通大学 桥梁工程系, 四川 成都 610031;2. 广东省公路建设有限公司, 广东 广州 510600 |
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| 基金项目： | 广东省重点领域研发计划项目(2019B111106002);国家自然科学基金项目(51878561,51978579);桥梁结构健康与安全国家重点实验室开放课题重点项目(BHSKL19-06-KF) |
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| 摘 要： | 钢桥面板的疲劳问题是制约钢结构桥梁可持续发展的关键难题,纵肋与顶板传统单面焊构造细节是控制钢桥面板疲劳性能、疲劳开裂危害最为严重的易损构造细节。以中国自主研发的纵肋与顶板新型双面焊构造细节为研究对象,研发了钢桥面板纵肋与顶板构造细节疲劳试验装置,参照近期中国典型重大工程的钢桥面板结构设计参数,在系统对比分析研究的基础上,设计12个构造细节疲劳试验模型和5个节段疲劳试验模型,通过疲劳破坏试验确定了纵肋与顶板新型双面焊构造细节的主导疲劳开裂模式和疲劳强度,探究了影响其疲劳性能的关键因素。研究结果表明:纵肋与顶板新型双面焊构造细节的疲劳强度显著高于纵肋与顶板传统单面焊构造细节,等效结构应力适用于纵肋与顶板新型双面焊构造细节的疲劳性能评估;实际熔透率不低于75%时多种焊接工艺条件下纵肋与顶板新型双面焊构造细节的主导疲劳开裂模式均为疲劳裂纹在顶板焊趾产生,并沿顶板板厚方向扩展,其名义应力疲劳强度高于90 MPa,等效结构应力疲劳强度高于100 MPa;制造缺欠是影响纵肋与顶板新型双面焊构造细节疲劳性能的关键因素;所研发的试验装置可通过构造细节模型实现对实际钢桥面板中纵肋与顶板焊接构造细节的准确模拟,准确获得纵肋与顶板构造细节疲劳性能。研究成果可为该长寿命新型构造细节的抗疲劳设计和工程实践提供依据。
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| 关 键 词： | 桥梁工程 正交异性钢桥面板 模型试验 纵肋与顶板新型双面焊构造细节 疲劳性能 |
| 收稿时间： | 2020-12-31 |
Fatigue Resistance of an Innovative Rib-to-deck Both-sides Welded Joint in Orthotropic Steel Bridge Deck |
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| ZHANG Qing-hua,DA Le-tian,LI Jun,WANG Kang-chen,YUAN Dao-yun,CUI Chuang,BU Yi-zhi.Fatigue Resistance of an Innovative Rib-to-deck Both-sides Welded Joint in Orthotropic Steel Bridge Deck[J].China Journal of Highway and Transport,2022,35(8):162-174. |
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| Authors: | ZHANG Qing-hua DA Le-tian LI Jun WANG Kang-chen YUAN Dao-yun CUI Chuang BU Yi-zhi |
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| Affiliation: | 1. Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China;2. Guangdong Highway Construction Co. Ltd., Guangzhou 510600, Guangdong, China |
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| Abstract: | The poor fatigue details of orthotropic steel bridge decks restrict the sustainable development of steel bridges.The rib-to-deck traditional single-side welded joints are the most vulnerable structural details that control the fatigue performance of orthotropic steel bridge decks,and the fatigue disease is the most serious.Focusing on a rib-to-deck innovative both-sides welded joint,a fatigue test device was developed by China and applied in a systematic comparative analysis.Twelve structural detail models and five segment models were designed according to the design parameters of major domestic projects and fatigue tested to determine the fatigue cracking patterns and fatigue resistances of rib-to-deck innovative both-sides welded joint.The critical factors influencing the observed fatigue resistances were then investigated.The results show that the fatigue strength of the rib-to-deck innovative both-sides welded joints is significantly higher than that of the rib-to-deck traditional single-side welded joints,and the equivalent structural stress is applicable to the fatigue resistance assessment of the rib-to-deck innovative both-sides welded joint.Under the condition that the actual weld penetration rate is not less than 75%,the dominant fatigue cracking mode of the rib-to-deck innovative both-sides welded joint when fabricated using various welding processes is that the fatigue crack initiates from the weld toe at the bottom surface of deck and then propagates along the deck plate.The nominal stress fatigue resistance is higher than 90 MPa and the equivalent stress fatigue resistance is higher than 100 MPa.Furthermore,the presence of initial manufacturing defects are key factors affecting the fatigue resistance of the rib-to-deck innovative both-sides welded joint.Thus,the use of structural detail models can effectively and accurately simulate the fatigue behavior of the rib-to-deck innovative both-sides welded joint in an orthotropic steel bridge,and accurately obtain fatigue resistance of the rib-to-deck innovative both-sides welded joint.The results of this research can provide a basis for design and engineering implementation of the rib-to-deck innovative both-sides welded joint. |
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| Keywords: | bridge engineering orthotropic steel bridge deck model test rib-to-deck innovative both-sides welded joint fatigue resistance |
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