钢结构旋转活动桥受载研究

Research on Loading of Steel Structure Rotating Movable Bridges

摘要:

为提升强台风地区钢结构旋转活动桥的设计水平与安全性能，解决河道通航与陆地交通的矛盾，保障桥梁运行效率，以国内同类型承载吨位最大的配重式双旋转钢结构活动桥为对象，采用MIDAS Civil 2019建立空间有限元模型，针对悬臂和简支两种工作状态，分析结构自重、车辆活载、风载等多工况组合下的支反力、应力及变形情况。结果显示，桥梁纵梁、主桁、纵肋等各部位的正应力、剪应力均符合允许值要求，最大竖向变形量远低于设计限值，整体结构具备充足安全裕量，可为同类型桥梁设计提供规范指导与技术借鉴。

Abstract:

To enhance the design level and safety performance of steel structure rotating movable bridges in strong typhoon areas, resolve conflicts between river navigation and land transportation, and ensure bridge operation efficiency, and taking the largest load-bearing tonnage of the same type of domestic counterweight double-rotating steel structure movable bridge as the object, a spatial finite element model is established using MIDAS Civil 2019. For the two working states of cantilever and simply supported, the reaction force, stress and deformation conditions under multiple working conditions such as the self-weight of the structure, live load of the vehicle and wind load are analyzed. The results show that the normal stress and shear stress of components such as longitudinal beams, main trusses and longitudinal ribs of the bridge all meet allowable value requirements. The maximum vertical deformation is far below the design limit, and the overall structure has sufficient safety margin, providing standardized guidance and technical reference for the design of similar bridges.