钢箱梁面板-纵隔板构造细节轮载应力响应特征分析  

Characteristic stress response of connection detail of inner box-girder web-to-deck plate under wheel loading

作　　者：欧阳洋[1,2] 祝志文 OUYANG Yang;ZHU Zhiwen(Hunan urban construction college,Xiangtan 411100,China;School of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南城建职业技术学院,湖南湘潭411100 [2]湖南大学土木工程学院,湖南长沙410082

出　　处：《铁道科学与工程学报》2018年第7期1762-1769,共8页Journal of Railway Science and Engineering

基　　金：国家重点基础研究发展计划("973"计划)资助项目(2015CB057701);湖南省交通科技资助项目(201522)

摘　　要：为研究车辆通行下正交异性钢箱梁面板-纵隔板构造细节轮载应力特征,建立带纵隔板的正交异性钢桥面板有限元分析模型,计算并对比轮载沿不同横桥向位置在纵桥向移动工况,面板-纵隔板构造细节及横桥向两侧疲劳敏感构造细节的应力响应。研究结果表明:纵肋-面板和纵隔板-面板构造细节均可分辨轴组中的单轴,因此,在疲劳荷载模型三规定的车辆通行下,每个构造细节将产生4个应力循环;应力峰值均发生在顺桥向两联轴的其中一个轮轴作用应力监测位置的正上方;当横桥向轮载中心位于纵隔板正上方时,纵肋-面板构造细节将在面板侧产生比其他横桥向轮载工况下更大的应力响应和应力幅;当桥面轮载从纵隔板一侧移动到另外一侧,或货车变道,或货车蛇行,均将导致纵隔板-面板构造细节的纵隔板侧产生较大的拉压应力幅。在设计带纵隔板的正交异性钢桥面板时,纵隔板不应布置在车道轮迹线正下方或紧靠车道轮迹线,而应远离车道轮迹线布置。且桥梁管理单位宜在桥面设置明显的标识,禁止桥面货车变道。In order to reveal the characteristics of wheel load stress response at connection details of inner box-girder web-to-deck plate under wheel loading, finite element model for orthotropic steel bridge with inner box-girder web was established. The stress response at connection details of inner box-girder web-to-deck plate and its fatigue sensitive position on both sides in transverse direction were calculated and compared with the wheel load along the different transverse locations and longitudinal motion loading case. It was found that the individual axle of axle-group could be identified by the connection details of rib-to-deck and inner box-girder web-to-deck plate, so four stress cycles produced in each connection details under vehicle traffic of the fatigue load model three. The peak stress occurred at monitoring position with one axle of a dual-wheel impacted in axial direction of the bridge. When the wheel load center was located in the inner box-girder web in transverse direction, larger stress response and stress range would be produced by the deck side connection details of rib-to-deck in comparison with the other wheel loads in transverse direction. The inner box-girder web side of connection details of inner box-girder web-to-deck plate produced larger tension and compression stress amplitude at the condition that wheel load on deck shifting from one side of the inner box-girder web to the other side, truck changing lanes, or truck snaking. It was concluded that inner box-girder web should be far away from the lane line of the wheel track instead of in the line of the wheel track lanes below or close to it in the design of orthotropic steel bridge deck with inner box-girder web. Also, obvious symbol of no changing lanes by truck should be installed on the bridge deck by the management department.

关 键 词：正交异性钢箱梁 有限元模型 纵隔板 应力响应 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]