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铁路正交异性桥面加劲肋-横隔板局部疲劳受力特性研究 预览

RESEARCH ON FATIGUE PERFORMANCE OF RIB-TO-DIAPHRAGM JOINT IN RAILWAY ORTHOTROPIC STEEL DECKS
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摘要 正交异性钢桥面因整体性好、承载力强等优势在铁路大跨度桁梁及箱梁斜拉桥、拱桥等桥型中应用越来越广泛,其疲劳特性与公路桥面具有显著的差异。针对铁路正交异性钢桥面加劲肋与横隔板连接处的疲劳敏感区,通过弹性支撑梁理论及闭口薄壁杆件理论分析其局部受力特征,提出了加劲肋疲劳敏感部位面内疲劳应力的解析公式,分析了解析公式中各疲劳影响因素的影响程度及作用机理。基于甬江特大桥——大跨度铁路斜拉桥的钢箱梁正交异性桥面设计了包含2个U肋及2个V肋的正交异性桥面疲劳试验模型,并进行了560万次疲劳加载。研究结果表明:解析公式与有限元分析、试验测试结果相符良好;试验模型测试结果能准确反映疲劳敏感点的应力情况,解析理论则能够反映疲劳敏感点应力的影响因素与规律;在铁路荷载下,加劲肋与横隔板的焊缝长度和加劲肋腹板倾角的增大能够有效降低加劲肋的疲劳应力幅;在铁路正交异性钢桥面板中面积相近、抗弯刚度相等的V肋比U肋具有更好的抗疲劳工作性能。 Orthotropic steel decks have been widely used in long-span truss girder and box girder cable-stayed bridges and arch bridges duo to their good integrity and high bearing capacity,while the fatigue characteristics of railway orthotropic steel deck are significantly different from those of highway bridges.According to the fatigue-prone details in rib-to-diaphragm joints of a railway steel bridge,the local stress properties were investigated by using elastic support beam theory and closed thin-walled bar theory.Furthermore,the analytic formula for calculating the fatigue stress of fatigue-prone details in the stiffener was presented.Then the influence degree and action mechanism of various fatigue factors included in analytic formula were also analyzed.Based on the orthotropic steel deck in Yongjiang Great Bridge,a large span railway cable-stayed bridge with steel box girders,a full-scale fatigue test model including 2 U-ribs and 2 V-ribs was designed,and 5.6 million cycles of fatigue test were performed.The results revealed that the analytic formula is in good agreement with finite element analysis and test results.The experiment model could accurately simulate the stress of the fatigue sensitive point in a practical structure,and analytic theory can reflect the influence factors and rules.The weld length of rib-to-diaphragm connections and the inclination of rib plate can effectively reduce the fatigue stress of a rib when exposed to train load.The V-rib has better anti-fatigue performance than the U-rib in a railway orthotropic steel deck when the area and the bending stiffness of two types of rib scheme keep the same.
作者 施洲 张勇 杨仕力 蒲黔辉 SHI Zhou;ZHANG Yong;YANG Shi-li;PU Qian-hui(Department of Bridge Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China)
出处 《工程力学》 EI CSCD 北大核心 2019年第2期124-133,共10页 Engineering Mechanics
基金 中国铁路总公司科技开发计划重大项目(2017G006-A).
关键词 大跨度铁路桥 正交异性钢桥面板 U/V形加劲肋 横隔板 疲劳试验 long span railway bridge orthotropic steel deck U/V-rib diaphragm fatigue tests
作者简介 通讯作者:施洲(1979―),男,江苏人,副教授,博士,主要从事桥梁试验及桥梁性能评定研究(E-mail:zshi1979@swjtu.edu.cn);张勇(1991―),男,山东人,硕士生,主要从事钢结构桥梁疲劳评估研究(E-mail:422714507@qq.com);杨仕力(1991―),男,四川人,博士生,主要从事桥梁结构动力学研究(E-mail:yangshiliswjtu@163.com);蒲黔辉(1965―),男,四川人,教授,博士,主要从事大跨度预应力混凝土桥结构行为的研究(E-mail:qhpu@vip.163.com).
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