考虑脉动风速的悬索跨越管桥涡激振动响应及疲劳分析  

Vibration and fatigue life analysis for wind-induced vibration of large span pipeline bridges under fluctuating wind load

作　　者：高建 王德国 何仁洋[2] 林树青[2] 

机构地区：[1]中国石油大学机械学院,北京102249 [2]中国特种设备检测研究院,北京100013

出　　处：《中南大学学报（自然科学版）》2011年第3期780-784,共5页Journal of Central South University:Science and Technology

基　　金：国家科技支撑计划项目(2006BAK02B01)

摘　　要：对悬索跨越管桥涡激振动响应及疲劳进行分析。考虑风速的脉动特性,利用Morison方程推导涡激耦合力,将动力载荷传递到管桥节点对结构动力响应进行分析;依据Miner理论对不同工况下管道和钢丝绳疲劳寿命进行计算。研究结果表明:考虑脉动风速时,随风速变化而变频变幅的涡激载荷力对结构振动的影响有限,并起到抑振的效果;结构的振动响应在4.0,8.0,9.5和11.5 m/s时出现峰值,最大竖向和横向振动幅值分别发生在风向攻角为0o和90o时;管道结构的疲劳寿命随风速的增加明显缩短。Vibration and fatigue life for wind-induced vibration of large span pipeline bridges were analyzed.Considering the pulse characteristic of wind speed,morison equation was used to deduce vortex-induced force,and the load was applied for dynamic analysis of bridge structures.The fatigue life of the pipe and wire rope was analyzed by Miner＇s theory.The results show that the fluctuating wind speed has the damping effect on vortex-induced vibration.Response peak value occurs when the wind speeds are 4.0,8.0,9.5 and 11.5 m/s.Vertical and transverse displacements are big separately in wind attack angle of 0o and 90o.With the increase of the wind speed,the fatigue life of pipeline reduces significantly.

关 键 词：悬跨管桥 风载荷 涡激振动 疲劳寿命 

分 类 号：TE873[石油与天然气工程—油气储运工程]