钢-混凝土结合梁悬索桥剪力钉滑移效应  

Slip Effect of Shear Studs in Steel-concrete Composite Beam Suspension Bridge

作　　者：陈楚龙[1] 高荣雄[1] 吴巧云[2] 江飞[3] 朱宏平[1] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]武汉工程大学环境与城市建设学院,湖北武汉430073 [3]中南电力设计院,湖北武汉430071

出　　处：《公路交通科技》2014年第1期71-76,共6页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51178203)

摘　　要：钢-混凝土结合梁由钢梁、混凝土板和剪力连接件组合而成,这三者在结合梁受力过程中分别存在不同程度的剪切变形,导致钢梁和混凝土板界面之间的相对滑移效应。本文基于ANSYS有限元技术,对世界上首座3塔4跨地锚式悬索桥——武汉鹦鹉洲长江大桥建立三维空间有限元全桥模型,通过有限元模型拼接技术将标准节段的精细化模型嵌入鱼刺梁式的杆系模型中,研究最不利工况状态下标准节段中预制桥面板与钢主梁之间剪力键的滑移效应。计算结果表明:在设计的移动荷载下,鹦鹉洲大桥最大的单钉剪力值为20.6 kN,仅为其设计承载强度的34.3%,最大滑移量值为0.086 mm;在1.5倍设计移动荷载下,最大的单钉剪力值为27 kN,为其设计承载强度的44.9%,最大滑移量值为0.163 mm。鹦鹉洲大桥现有剪力连接栓钉工作性能良好,承载富余较大。Steel-concrete composite beam is combined by steel girder, concrete slab and stud connectors, there are different degrees of shearing deformation in the 3 components of the composite beam during stress process, which cause the relative slip effect between the interface of concrete slab and steel girder. Based on the ANSYS finite element method （ FEM）, a 3D finite element model of the world＇s first 3-pylon 4-span suspension bridge （Wuhan Yingwuzhou Yangtze River Bridge ） is built. By the splicing technique of FE models, the refined model of the standard segment is embedded into the fishbone beam truss model, and the slip effect of the shear connector between the steel girder and the precast concrete slab under the most unfavorable condition is studied. The calculation result shows that （1） under the design moving load, the peak value of the single stud connector＇s shearing force of Yingwuzhou bridge is 20.6 kN, which is only 34.3% of its design bearing strength, the maximum value of the relative slipping is 0. 086 mm; （2） under 1.5 times the design moving load, the peak value of the single stud connector＇s shearing force is 27 kN, which reaches 44. 9% of its design bearing strength, and the maximum value of the relative slipping is 0. 163 ram. These data indicate that the working performance of the existing stud connectors used in Yingwuzhou bridge is excellent, and the bearing capacity is surplus.

关 键 词：桥梁工程 钢-混凝土结合梁 滑移效应 有限元模型拼接 栓钉连接件 

分 类 号：U441[建筑科学—桥梁与隧道工程]