大跨度桥梁近距离拉索风载作用的数值模拟  

Numerical Simulation of Wind Load on Close-range Cables of Long-span Bridges

作　　者：孙亭亭[1,2] 杨吉新[2] 黎建华 史言稳 SUN Tingting;YANG Jixin;LI Jianhua;SHI Yanwen(Department of Architecture and Civil Engineering,Anqing Vocational & Technical College,Anqing 246003,China;School of Transportation,Wuhan University of Technology,Wuhan 430063,China;CCCC Second Harbor Consultants Co.,Ltd.,Wuhan 430060,China;Jiangsu Huarui Heavy Machinery Co.,Ltd.,Changzhou 213179,China)

机构地区：[1]安庆职业技术学院建筑工程系,安徽安庆246003 [2]武汉理工大学交通学院,湖北武汉430063 [3]中交第二航务工程勘察设计院有限公司,湖北武汉430060 [4]江苏华瑞重工机械有限公司,江苏常州213179

出　　处：《济南大学学报（自然科学版）》2019年第2期95-100,共6页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(51378406);安徽省高校自然科学研究项目(KJ2016A448;KJ2017A787)

摘　　要：为了研究大跨度桥梁中近距离并列拉索在脉动风场下的响应,建立桥梁并列拉索三维实体数值模型,采用MATLAB软件模拟随机脉动风场并导入流体力学计算软件Fluent中,选择计算精度较高的重整化群组理论(RNG)k-ε湍流模型作为计算模型,对近距离并列拉索的3种不同高度处风压分布和风速分布进行数值分析。结果表明:风压力随着高度的增加而增大,在上游拉索前端正压力最大,两侧负压力最大;最大风速出现在两索之间,在下游拉索后端不断减小,随着高度的不同,风速变化呈现规律性;在上游拉索和下游拉索之间区域的风速出现紊乱现象,主要原因是拉索距离较近,两索之间相互影响效应比较明显。To study the response of close-range cables in parallel under a fluctuating wind field in a long-span bridge,a three-dimensional physical model of a bridge parallel cable was established.Using MATLAB software to simulate the stochastic fluctuating wind field and importing it into fluid mechanics software Fluent,the re-normalization group(RNG)k-ε turbulence model with high calculation accuracy was selected as the calculation model,the close-range cables in para-llel under the wind pressure distribution and the wind speed distribution at three heights were numerically analyzed.The results show that the wind pressure increases with height.In the upstream cable,the maximum positive pressure is at the front of the advanced cable and the maximum negative pressure is at both sides.The maximum wind speed occurs between the two cables,and at the back end of the downstream cable decreases continuously.The variation of wind speed is regular with the change of height.The disturbance of the wind speed occurs in the area between the upstream cable and the downstream cable,the main reason is the close distance of the cables and the obvious mutual influence between the two cables.

关 键 词：大跨度桥梁 涡流 数值计算 并列拉索 重整化群组理论k-ε湍流模型 

分 类 号：O368[理学—流体力学] U441.2[理学—力学] TU312.1[建筑科学—桥梁与隧道工程]