大型斜拉索管桥在平面外的横向位移分析

Analysis on Out-Of-Plane Lateral Displacement of Cable-stayed Pipeline Bridge

管道建设中常遇到河流、湖泊、沼泽、山谷、冲沟等自然障碍物或人工构筑物,为在工程技术上克服这些困难,需采取穿跨越方式通过,大型斜拉索管桥就是一种常用的跨越型式。通过计算方法研究,提出了一种新的简明计算斜拉索管桥平面外的横向位移分析方法,推导了斜拉索对承重管的横向约束刚度公式。以西乡-汉中、汉中-安康输气管道工程石泉汉江斜拉索管桥为例,通过对横向风荷载、横向约束刚度的分析,详细计算了管桥的横向位移,讨论了该方法的精度问题。该方法对今后斜拉索跨越管桥的初步分析与方案比选提供了参考意义。

Such natural obstacles as rivers,lakes,swamps,valleys and gullies or artificial structures often exist in pipeline construction,under or overhead crossing ways are adopted to cross such obstacles and large cable-stayed pipeline bridge is one of common overhead crossing ways.Such examples include the completed South Guang River overhead crossing project,Chishui River overhead crossing project,Yangtze River overhead crossing project in Fuling,Chongqing and Hanjiang River overhead crossing project in Xiangfan,Huhan Province,etc.,the large cable-stayed pipeline bridges operate properly always since completion.Studied are calculation methods,proposed is a new analysis method for calculating out-of-plane lateral displacement of cable-stayed pipeline bridge and derived is a transverse restraint stiffness formula of the pipeline bridge to the bearing cable pipes.Analyzed are horizontal wind load and lateral restraint stiffness of cable-stayed pipeline bridge over Shiquan Hanjiang River in Hanzhong-Ankang Gas Pipeline Project,calculated is the lateral displacement of the bridge and analyzed is the accuracy of this method and results show that this method has reference value for preliminary analysis and scheme comparison in future cable-stayed pipeline bridge construction.