大跨度铁路桥梁海、陆风场差异性研究  

A Comparative Study of Wind Effects on Long-span Railway Bridges in Oceanic and Land-based Environments

作　　者：房忱 胡锐[1,2] Fang Chen;Hu Rui(Key Laboratory of Railway Industry on Disaster Prevention and Mitigation for Railways in Special and Complex Mountains,Southwest Jiaotong University,Sichuan,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Sichuan,Chengdu 610031,China)

机构地区：[1]西南交通大学复杂艰险山区铁路防灾减灾铁路行业重点实验室,四川成都610031 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《铁道技术标准（中英文）》2023年第6期17-25,共9页Railway Technical Standard(Chinese & English)

基　　金：国家自然科学基金(52208504);中央高校基本科研业务费(A0920502052301-224)。

摘　　要：为研究桥址区海、陆风场的差异及其对铁路桥梁的影响,开展桥址区海、陆风场数值模拟和桥梁风荷载数值计算研究。考虑海面粗糙度、海气交换等因素影响,从风剖面、风谱、相干函数3个角度进行海洋风场与陆地风场的对比,进而实现海、陆风场的数值模拟和风荷载计算。结果表明:海、陆风场紊流特性和空间相干性差异显著,内陆铁路桥梁较海洋铁路桥梁风荷载的阻力、升力和力矩分别增加6.1%、5.5%和5.9%,但由于海洋风谱的能量高于陆地风谱,海洋铁路桥梁所受的抖振力高于内陆铁路桥梁。To study the difference between ocean and land wind fields in bridge site and its influence on railway bridge,the numerical simulation of ocean and land wind fields and numerical calculation of bridge wind load at bridge site were carried out.Considering the influence of ocean surface roughness,air-ocean exchange and other factors,the comparison of ocean wind field and land wind field was carried out in terms of wind profile,wind spectrum and coherence function,so as to realize the numerical simulation and wind load calculation of ocean and land wind fields.The results show that the turbulence characteristics and spatial coherence of ocean and land wind fields are significantly different.The drag force,lift force and torsion of inland railway bridges increase by 6.1%,5.5% and 5.9%,respectively,compared with that of ocean railway bridges.However,because the energy of ocean wind spectrum is higher than that of land wind spectrum,the buffeting force suffered by ocean railway bridges is higher than that suffered by inland railway bridges.

关 键 词：海陆风场 风谱 风剖面 铁路桥梁 风荷载 

分 类 号：U24[交通运输工程—道路与铁道工程]