山区峡谷大跨度管道桥风致响应  

Wind induced response of long-span pipeline bridge in mountainous valley

作　　者：王凯[1] 廖海黎[1] 李明水[1] 马存明[1] 左雷斌[2] 

机构地区：[1]西南交通大学风工程试验研究中心,四川成都610031 [2]中国石油天然气管道局,河北廊坊065000

出　　处：《石油学报》2014年第3期564-569,共6页Acta Petrolei Sinica

基　　金：国家自然科学基金项目(No.51278435)资助

摘　　要：山区气象条件非常复杂,气流对跨越山区峡谷的管道桥将产生非常不利的影响,大跨度管道桥的抗风问题已成为管道桥设计中重要的考虑因素。针对山区峡谷大跨悬索和斜拉管道桥两种类型的跨越结构,总结山区峡谷管道桥设计风参数的选取方法,得到了两座管道桥桥面高度处设计风速。通过节段模型风洞试验,获取了两种类型管道桥主梁的气动力系数,为桥梁的抗风设计提供了重要参数。基于全桥气弹模型风洞试验,总结了管道桥气弹模型的相似关系,给出了管道桥主梁、大缆、拉索、桥塔和桥墩各构件模型的设计和制作方法,特别是主梁模型设计中用到的"U"型弹簧设计方法,试验最后得出了这两类管道桥的风致响应特征。研究结果表明,跨度300m以下桁架管道桥具有很好的抗风安全性,为以后类似的管道桥设计提供参考和依据。In mountainous areas,meteorological conditions is complex.Airflow makes very adverse effects on pipeline bridges that span mountainous valley.Wind-resistant performance of long-span pipeline bridges has thus become one of the critical issues concerned in the design of pipeline bridges.This study summarizes the method for determining design wind parameters and proposes the design wind speeds at deck levels of two types of span structures,a long-span suspension bridge and a cable-stayed bridge in mountainous valley.Aerodynamic parameters of the girder are obtained for the two types of pipeline bridges via section model wind testing,which provide important parameters for wind-resistant design of the bridge.Full-bridge aeroelastic model testing is conducted to summarize the similarity relation of aeroelastic model and provide the model design and manufacture details of main beam,main cable or stayed-cables,pylons,and piers of the bridges.In particular,a U-shaped string is used to simulate the stiffness of girders.Wind induced response characteristics of the two types of pipeline bridges are finally obtained through wind tunnel testing.Results show that truss pipeline bridge with a span less than 300 m has high safety quality of wind resistance.This work provides a reference and lays a foundation for future design of similar bridges in mountainous valley region.

关 键 词：山区峡谷桥梁 管道桥 “U”型弹簧 气弹模型 风洞试验 

分 类 号：TE973.4[石油与天然气工程—石油机械设备]