东北寒区大跨度自锚式悬索桥主缆力学效应研究  

Winter Construction Techniques for Bottom Sealing Concrete of Steel Sheet Pile Cofferdam Cofferdams of Songpu Bridge

作　　者：姚天宇 

机构地区：[1]哈尔滨市市政工程设计院,哈尔滨市150000

出　　处：《北方交通》2015年第12期20-24,共5页Northern Communications

摘　　要：结合大跨自锚式悬索桥空间缆索结构,引入桥位所处的东北寒区大温差分布模式,运用空间有限元分析方法,探讨了主缆在典型荷载工况及特殊的大温差模式下的受力变形特性。研究结果表明:主缆在空缆状态向成桥状态转变过程中,其横向与竖向均发生较大位移,其几何非线性主要发生于施工阶段;主缆弯曲次应力幅值较小,理论上不控制设计;寒区大温差效应对主缆的影响不容忽略,温差越大对主缆变形与内力影响越大,大温差模式下,主缆轴力跨中的最大变化值为73.4k N,主缆跨中垂度由于温度影响最大变化约为3.0cm。Combined with large span self anchored suspension bridge with spatial cable structure,the introduction of a bridge with large temperature difference distribution pattern of the northeast cold area. Using finite element analysis method,the stress deformation characteristics of the main cable under typical load cases and special large temperature difference mode are discussed. Research results show that： In the process of changing the state of the main cable to the state of the bridge into the bridge,there are large displacement on horizontal and vertica. Its geometric nonlinearity mainly occurs in the construction stage. Main cable bending stress amplitude is small,theoretically no control design. Effect of cold and large temperature difference effect on the main cable can not be ignored. The greater the temperature difference,the larger effect on main cable deformation and internal force. Under large temperature difference mode,the maximum variation Axial force of the main cable cross is 73.4k N,The maximum variation of the main cable cross span is about 3. 0cm.

关 键 词：桥梁工程 自锚式悬索桥 主缆 有限元分析 大温差模式 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]