并列双钝体箱梁气动力的干扰机理研究  

THE AERODYNAMIC INTERFERENCE MECHANISM OF BOX GIRDERS WITH PARALLEL DOUBLE BLUFF BODIES

作　　者：刘慧杰 陈帅 刘小兵 LIU Hui-jie;CHEN Shuai;LIU Xiao-bing(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Wind Engineering Research Center,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043 [2]石家庄铁道大学风工程研究中心,石家庄050043 [3]河北省风工程和风能利用工程技术创新中心,石家庄050043

出　　处：《工程力学》2020年第S01期224-228,共5页Engineering Mechanics

基　　金：河北省自然科学基金项目(E2018210105);河北省高等学校科学技术研究项目(ZD2019118);河北省大型基础设施防灾减灾协同创新中心资助项目。

摘　　要：为了研究并列双钝体箱梁气动力的干扰机理,进行了双钝体箱梁在不同间距比下的数值计算,并与风洞试验结果进行对比。研究表明:数值计算所得的气动力系数变化规律与风洞试验结果基本一致,数值计算得到的可视化流场分布可以解释气动力的干扰机理;并列双箱梁之间存在明显的漩涡,这是上游箱梁阻力系数减小、下游箱梁阻力系数为负的主要原因;下游箱梁的顶板受到的风吸作用明显减弱,这是下游箱梁升力显著减小的主要原因。To study the mechanism of aerodynamic interference of box girders with parallel double bluff bodies,the numerical calculation of double bluff box girders under winds of different spacing ratios was carried out.By comparing the calculation results with wind tunnel test data,it is shown that the variation law of the aerodynamic coefficients obtained by the numerical calculation is basically consistent with the wind tunnel test results.Therefore,the visual flow field distribution obtained by the numerical calculation can explain the aerodynamic interference mechanism.There are obvious whirlpools between the double bluff body box girders.This is the main reason why the drag coefficient of the upstream box girder decreases and that of the downstream box girder is negative.The wind suction effect of the roof of the downstream box girder is obviously weakened.This is the main reason why the lift of the downstream box girder decreases remarkably.

关 键 词：并列双钝体箱梁 干扰机理 数值计算 风洞试验 气动力系数 

分 类 号：U441[建筑科学—桥梁与隧道工程] TU312.1[交通运输工程—道路与铁道工程]