正交异性钢桥面板纵肋与横隔板的主导开裂模式研究  

Study on Dominant Cracking Mode of Longitudinal Rib and Diaphragm of Orthotropic Steel Deck

作　　者：徐军[1,2] 朱金柱[3] 陈焕勇 XU Jun;ZHU Jinzhu;CHEN Huanyong(College of Civil Engineering,Tongji University,Shanghai 200092,China;CCCC Highway Consultants Co.,Ltd.,Beijing 100010,China;CCCC Second Harbor Engineering Co.,Ltd.,Wuhan 430040,China;Shenzhen-Zhongshan Link Administration Center,Zhongshan 528451,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]中交公路规划设计院有限公司,北京100010 [3]中交第二航务工程局有限公司,湖北武汉430040 [4]深中通道管理中心,广东中山528451

出　　处：《桥梁建设》2023年第6期55-62,共8页Bridge Construction

基　　金：广东省重点领域研发计划项目(2019B111106002)。

摘　　要：为给正交异性钢桥面板纵肋与横隔板交叉构造细节的正交异性抗疲劳设计提供理论依据,以某大桥正交异性钢桥面板设计方案为背景,建立包含纵肋与横隔板交叉构造细节的正交异性钢桥面板有限元模型,分析关键结构设计参数对该构造细节各开裂模式应力幅的影响,以及该构造细节主导开裂模式的迁移机制。结果表明:纵肋与横隔板交叉构造细节各开裂模式的纵向应力影响线主要分布在关注部位相邻跨范围内,横向应力影响线主要分布在关注部位相邻2个纵肋范围内;顶板厚度对各开裂模式应力幅影响较小,不会使主导开裂模式迁移;横隔板厚度和间距对各开裂模式应力幅影响程度的差异显著,随着横隔板厚度和间距的增加,该构造细节的主导开裂模式发生迁移。The design scheme of the steel deck of a bridge is used for a case study to present theoretical basis for the fatigue details design of rib-to-diaphragm welded joints in orthotropic steel deck.A finite element model entailing the rib-to-diaphragm welded joints was established to analyze the influences of key structural design parameters on the stress ranges of different cracking modes of the fatigue details as well as to figure out the transition mechanism of the dominant cracking modes of rib-to-diaphragm welded joints.It is shown that the longitudinal stress influential lines of different cracking modes are mainly distributed within the adjacent spans of the key concerned locations,while the transverse stress influential lines are mainly distributed within the two adjacent longitudinal ribs of the key concerned locations.Increasing the thickness of top plates merely leads to minor reduction of the stress range,which would not cause the transition of dominant cracking mode.The influence of thickness and spacing of the diaphragms on stress ranges of different cracking modes are varying,as the thickness and spacing increase,the dominant cracking modes of rib-to-diaphragm welded joints show sign of transition.

关 键 词：正交异性钢桥面板 纵肋与横隔板交叉构造细节 主导开裂模式 应力 有限元法 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]