| 高疲劳抗力钢桥面板的疲劳问题Ⅱ：结构体系抗力 |
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| 引用本文： | 张清华,袁道云,李俊,吴亚坤,崔闯.高疲劳抗力钢桥面板的疲劳问题Ⅱ：结构体系抗力[J].中国公路学报,2021,34(11):104-115. |
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| 作者姓名： | 张清华 袁道云 李俊 吴亚坤 崔闯 |
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| 作者单位： | 西南交通 大学桥梁工程系, 四川 成都 610031 |
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| 基金项目： | 国家自然科学基金项目（51878561，51978579，51778533，51578455）；广东省重点领域研发计划项目（2019B111106002） |
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| 摘 要： | 为了深刻认识高疲劳抗力钢桥面板的疲劳特性，准确评估其结构体系的疲劳抗力，基于等效结构应力建立了考虑焊接微裂纹对钢桥面板疲劳性能劣化效应的结构体系疲劳抗力评估方法，并通过疲劳试验对所建立的评估方法进行了验证。在此基础上采用所建立的结构体系疲劳抗力评估方法对高疲劳抗力钢桥面板的疲劳开裂模式、疲劳抗力及其影响因素等相关关键问题进行系统研究。研究结果表明：焊接微裂纹的存在会显著降低钢桥面板的疲劳性能，导致主导疲劳开裂模式发生迁移；结构体系设计参数对纵肋与顶板双面焊构造细节和纵肋与横隔板新型交叉构造细节疲劳性能的影响有显著区别，其中纵肋与顶板双面焊构造细节的疲劳性能主要对顶板厚度的变化较为敏感，其疲劳性能随着顶板厚度的增加而显著提升，而纵肋与横隔板新型交叉构造细节的疲劳性能同时受多个参数的影响，其疲劳性能随着顶板厚度、横隔板厚度和纵肋高度的增大而提升，随着横隔板间距和纵肋底板与横隔板之间焊缝长度的增大而降低；传统钢桥面板的主导疲劳开裂模式为纵肋腹板与横隔板交叉构造细节围焊焊趾开裂，高疲劳抗力钢桥面板的主导疲劳开裂模式为纵肋底板与横隔板交叉构造细节纵肋焊趾开裂；相对于传统正交异性钢桥面板，高疲劳抗力钢桥面板结构实现了主导疲劳开裂模式的迁移，疲劳性能显著提高。
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| 关 键 词： | 桥梁工程 正交异性钢桥面板 结构体系疲劳抗力 等效结构应力 主导疲劳开裂模式 |
| 收稿时间： | 2020-04-17 |
Fatigue Performance of High Fatigue Resistance Orthotropic Steel Bridge Deck Ⅱ: Fatigue Resistance of Structural System |
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| ZHANG Qing-hua,YUAN Dao-yun,LI Jun,WU Ya-kun,CUI Chuang.Fatigue Performance of High Fatigue Resistance Orthotropic Steel Bridge Deck Ⅱ: Fatigue Resistance of Structural System[J].China Journal of Highway and Transport,2021,34(11):104-115. |
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| Authors: | ZHANG Qing-hua YUAN Dao-yun LI Jun WU Ya-kun CUI Chuang |
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| Affiliation: | Department of Bridge Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China |
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| Abstract: | To explore the fatigue characteristics of an innovative high-fatigue resistant orthotropic steel bridge deck (OSD) and accurately evaluate its fatigue resistance, an evaluation method was proposed considering the deterioration effect of welding microcracks on the fatigue performance of an OSD, which is based on equivalent structural stress. The applicability of the evaluation method was further demonstrated by relevant fatigue test results. The fatigue cracking patterns, fatigue resistance, and corresponding key influencing factors of the innovative high fatigue resistant OSD were systematically studied using the above evaluation method. The results indicate that the fatigue resistance of the OSD was reduced and the dominant fatigue cracking patterns were transferred owing to the initial welding microcracks. The effect of design parameters on the fatigue performance of an innovative both-side welded rib-to-deck joint and an innovative rib-to-diaphragm welded joint are significantly different. The fatigue performance of the rib-to-deck welded joint is sensitive to the deck thickness, and its fatigue resistance is improved significantly with an increase in the deck thickness. The fatigue performance of the innovative rib-to-diaphragm welded joint is affected by multiple parameters, and its fatigue resistance is improved with an increase in the deck thickness, diaphragm thickness, and height of the U-rib, and decreases with the increase in the distance between the diaphragms and the length of the weld between the bottom plate of the rib and the diaphragm. The predominant crack pattern of a traditional OSD is crack initiation from the weld toe of the rib-to-diaphragm welded joint and propagation through the web of the rib. The predominant crack pattern of the innovative high fatigue resistance OSD is crack initiation from the bottom weld toe of the rib and propagation through the bottom plate of the rib. Compared with the traditional OSD, the predominant crack pattern of innovative high fatigue resistant OSD is transferred, and the fatigue resistance is improved. |
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| Keywords: | bridge engineering orthotropic steel bridge deck fatigue resistance of structural system equivalent structural stress predominant fatigue crack pattern |
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