跨海大桥桥塔区风环境数值风洞模拟  

STUDY ON THE CROSSWIND ENVIRONMENT AROUND THE TOWER AND DECK OF SEA-CROSSING BRIDGE BY CFD

作　　者：艾辉林[1] 陈艾荣[1] 

机构地区：[1]同济大学桥梁工程系,上海200092

出　　处：《工程力学》2010年第A01期196-199,204,共5页Engineering Mechanics

基　　金："十一五"国家科技支撑计划项目(2006BAG04B01)

摘　　要：跨海大桥桥面风环境决定了车辆的行驶安全性和舒适性,特别对于实桥的桥塔区域,由于桥塔绕流的影响,导致该区域附近的流场分布更加复杂。该文采用数值风洞技术,利用大涡模型来模拟湍流效应,数值模拟了桥面无附属结构、桥面仅布置栏杆及桥面布置栏杆风障三种工况下桥塔区域的风环境。模拟结果显示,桥塔的存在对桥面风速分布有明显的折减效应,使得车辆通过桥塔区域时可能产生较明显的侧向滑移。仅在桥面布置栏杆无法保障离桥面较高区域有合理的风速分布,但通过合理布置风障结构,桥塔区整个区域折减效果较理想,风速脉动变化更平缓,从而有利于车辆行驶的安全性。The crosswind environment of a Sea-Crossing Bridge＇s deck can influence the safety and comfort of vehicles.Especially around the tower,the crosswind environment above the deck is more complex and turbulent.By using the numerical wind technology and large eddy simulation to solve turbulence,the crosswind environment around the tower is simulated under three cases,which are the deck without subsidiary structures,the deck with railings only,and the deck with railings and wind barriers.The results of simulation reveal that the distribution of wind velocity has significant discount around the tower,which may make a vehicle produce more significant side-slip when it runs through the bridge tower.Only with the railings,the distribution of wind velocity may be not very reasonable around the region higher from the deck.But through the rational layout of wind barriers,the discount of wind velocity around the tower is more comfortable,the turbulent wind is more slowly,and the safety of vehicle is more benefited.

关 键 词：跨海大桥 风环境 数值风洞 大涡模拟 风障 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]