随机风速下桥上汽车行车安全可靠性分析  

Analysis of vehicle safety and reliability on the bridge exposed to stochastic winds

作　　者：向圆芳 王方立 韩艳 胡朋 蔡春声 XIANG Yuanfang;WANG Fangli;HAN Yan;HU Peng;CAI Chunsheng(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China;China Road&Bridge Corporation,Beijing 100011,China;Louisiana State University,Baton,LA70803,Louisiana,USA)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114 [2]中国路桥工程有限责任公司,北京100011 [3]美国路易斯安那州立大学美国路易斯安那州,巴吞鲁日LA70803

出　　处：《铁道科学与工程学报》2020年第12期3126-3134,共9页Journal of Railway Science and Engineering

基　　金：国家自然科学基金优秀青年基金资助项目(51822803);湖南省杰出青年基金资助项目(2018JJ1027);湖南省教育厅优秀青年基金资助项目(16B011)。

摘　　要：为了探讨风速的随机性对桥上行车安全可靠性的影响,首先通过CFD数值模拟获得了桥上车辆的气动力系数;基于提出的移动点脉动风速谱,随机生成移动车辆的脉动风速;基于风-车-桥系统耦合振动分析,考虑风速的随机性,建立了一种求解系统失效概率的极限状态函数模型,采用响应面方法对桥上汽车行车安全进行了可靠性评估。计算结果表明:桥上车辆横风失效概率随风速和车速的增大而增大;车速越高,车辆安全行驶对风速的敏感程度越高;基于可靠性理论模拟的概率特征风速曲线能够较合理地评估随机风速下桥上车辆的行车安全性。This study investigated the effect of the randomness of wind speed on the reliability of the driving safety of vehicles on the bridge.Firstly,the aerodynamic coefficients of vehicles on the bridge were obtained by CFD numerical simulation.The fluctuating wind speed of a moving vehicle was generated randomly based on the proposed fluctuating wind speed spectrum of a moving vehicle.Based on the coupled vibration analysis of the wind-vehicle-bridge system,considering the randomness of wind speed,a limit state function model was established to solve the failure probability,and the response surface method was used to evaluate the reliability of vehicle driving safety on the bridge.The results show that the probability of failure increases with the increase of wind or vehicle speed under crosswinds.Vehicle safety is more sensitive to wind speed as vehicle speed increases.The characteristic wind speed curve based on the reliability theory can reasonably evaluate the vehicle safety under random wind speed.

关 键 词：风−车−桥系统 CFD数值模拟 随机风速 行车安全 可靠性分析 

分 类 号：U447[建筑科学—桥梁与隧道工程]