钢-STC轻型组合桥面结构多参数分析  

Multi-parametric Analysis on Steel-STC Lightweight Composite Bridge Deck

作　　者：詹健 邵旭东[1] 曲宛桐[1,3] 曹君辉 ZHAN Jian1,2, SHAO Xu-dongl, QU Wan-tong1,3, CAO Jun-hui1(1. College of Civil Engineering, Hunan University, Changsha Hunan 410082, China; 2. College of Civil and Transportation Engineering, Hohai University, Nanjing Jiangsu 210098, China; 3. Guangdong Provincial Transport Planning ＆ Design Institute Co. , Ltd. , Guangzhou Guangdong 510507, Chin)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]河海大学土木与交通学院,江苏南京210098 [3]广东省交通规划设计研究院股份有限公司,广东广州510507

出　　处：《公路交通科技》2018年第5期73-81,90,共10页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51178177;51378194);交通运输部重大科技专项项目(2011318494160)

摘　　要：为综合研究STC层厚度、隔板厚度、栓钉间距对轻型组合桥面结构疲劳性能的影响,分析各参数间的协作性,得到基于该3种参数下轻型组合桥面结构的综合优化设计参数。以某大桥为工程背景,建立ANSYS局部有限元模型,对不同STC厚度、隔板厚度、栓钉间距情形下,钢桥面典型易疲劳开裂细节进行应力幅计算,并采用名义应力法对计算结果进行评估。基于有限元分析结果,得出以下结论:轻型组合桥面结构可以大幅提高钢桥面板的局部刚度,但对于整体刚度的贡献有限。各设计参数下的轻型组合桥面结构,对面板与U肋连接细节应力幅的改善作用均很大,而对其他细节改善作用则相对较小,U肋与隔板交叉处隔板裂纹细节为轻型组合桥面结构的开裂控制细节;STC层厚度由45 mm增加到60 mm可进一步降低钢桥面各疲劳细节应力幅;隔板变厚对U肋与横隔板交叉处隔板裂纹细节、U肋下缘对接焊缝细节应力幅改善较大,降幅为20%~29%;栓钉变密对U肋与横隔板交叉部位、弧形切口处细节改善作用明显,应力幅降低22.01%~27.96%;模拟的12种轻型组合桥面结构方案中,有7种方案的典型疲劳细节均满足疲劳强度设计要求,有一种方案理论上基本不会疲劳开裂。To comprehensively study the influences of thickness of STC layer,thickness of diaphragms and spacing of stud shear connectors on the fatigue property of lightweight composite bridge deck,the cooperation among the 3 parameters is analyzed and the comprehensive optimum design parameters of lightweight composite bridge deck under the 3 design parameters are obtained. Based on a bridge,the ANSYS local FE model is built to calculate the fatigue stress amplitude of the typical fatigue-prone cracking details of steel bridge deck under different values of the 3 parameters,and the calculation result is evaluated by the nominal stress method. Based on the result of FE analysis,it is concluded that（ 1） the lightweight composite bridge deck structure could strongly enhance the local stiffness of the steel bridge deck, but it has limited contribution to the global stiffness of the bridge deck;（ 2） the lightweight composite bridge deck structure under different design parameters has more influence on the stress amplitude of U-rib-to-deck connection details than that on other details,and the diaphragm cracking details at the U-rib-to-diaphragm weld joints are the cracking control details of the structure;（ 3） increasing the thickness of the STC layer from 45 mm to 60 mm could further reduce the fatigue stress amplitude of fatigue-prone details in the steel deck;（ 4）increasing the thickness of the floor beams could better improve the details of cracking at the U-rib-todiaphragm connection and butt weld at U-rib lower edge,and the stress amplitude reduction is about 20%-29%;（ 5） reducing the spacing of the stud shear connectors could obviously decrease the stress amplitude of the U-rib-diaphragm weld joints and the arc cutouts in floor beams,and the stress amplitude reductions ranged from 22. 01% to 27. 96%;（ 6） According to the simulation,7 of the 12 lightweight composite bridge deck schemes could satisfy the fatigue strength design requirements and one scheme would never crack theoretically.

关 键 词：桥梁工程 参数分析 名义应力法 轻型组合桥面 疲劳性能 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]