拱桥吊杆涡激风振疲劳寿命评估  

Assessment on Fatigue Life of Arch Bridge Hangers Caused by Vortex-induced Vibration

作　　者：王祥真 芦杰 WANG Xiang-zhen1 , LU Jie2(Traffic Engineering Quality and Safety Supervision Station of Shaoxing City, Shaoxing 312000, Zhejiang, Chin)

机构地区：[1]浙江省绍兴市交通工程质量安全监督站,浙江绍兴312000

出　　处：《筑路机械与施工机械化》2018年第4期122-126,共5页Road Machinery & Construction Mechanization

摘　　要：为便于桥梁运营管理单位开展桥梁维护与检修,对易于发生涡激风振的圆形截面刚性吊杆的可承受应力循环次数进行估算,以明确吊杆的合理使用年限。借助经典涡振起振临界风速、涡激力计算模型及钢结构疲劳寿命计算理论,对某钢管混凝土拱桥的所有圆形吊杆的动力特性、内力及对应的涡振风速范围进行计算,并结合桥梁所在地风速分布统计数据,对该桥吊杆的涡振疲劳寿命进行评估。研究结果表明,该桥吊杆的疲劳寿命在当地风速条件下满足使用要求,计算过程可为同类桥梁吊杆涡振疲劳寿命评估提供参考。In order to facilitate the maintenance and repair of bridges by operators,the number of acceptable stress cycles of circular cross-section rigid hangers prone to vortex-induced vibration was estimated to determine the reasonable service life of the hangers.The dynamic characteristics of all circular hangers of a concrete-filled steel tubular arch bridge,the internal forces of hangers,and the corresponding speed range of vortex-induced wind were calculated by means of the classic critical speed of vortex-induced wind,calculation model for vortex-induced force,and the theory about fatigue life calculation of steel structure.Combined with the statistical data of the wind speed distribution at the bridge site,the fatigue life of the bridge hangers caused by vortexinduced vibration was evaluated.The results indicate that the fatigue life of the bridge hangers meets the requirements of use under local wind speed conditions,and the calculation process provides a reference to the assessment of fatigue life caused by vortex-induced vibration.

关 键 词：钢管混凝土拱桥 寿命评估 吊杆 涡激风振 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]