气动干扰对分离双扁平箱梁三分力系数的影响  

Influences of Aerodynamic Interference on Three-Component Coefficients of Separated Twin Flat Box Girders

作　　者：刘小兵 李少杰[3] 杨群 刘庆宽 

机构地区：[1]石家庄铁道大学大型结构健康诊断与控制研究所,河北石家庄050043 [2]河北省大型结构健康诊断与控制重点实验室,河北石家庄050043 [3]石家庄铁道大学土木工程学院,河北石家庄050043

出　　处：《桥梁建设》2017年第5期53-58,共6页Bridge Construction

基　　金：国家自然科学基金项目(51308359);河北省高等学校科学技术研究基金项目(QN20131169;QN2015213)~~

摘　　要：为研究分离双主梁间距及风攻角对分离双扁平箱梁三分力系数气动干扰效应的影响,制作缩尺比为1∶50的分离双扁平箱梁节段模型,进行风洞试验。测试-10°~10°风攻角范围内分离双扁平箱梁在15个不同间距(双箱梁的净间距D与单幅箱梁宽B之比的变化范围为0.025~6)下的三分力系数,并与单幅扁平箱梁的三分力系数进行对比。结果表明:气动干扰对分离双扁平箱梁三分力系数的影响主要表现为对下游箱梁的影响。对阻力系数而言,这种影响主要体现在D/B≤1的间距范围,且表现为减小效应;对升力系数而言,这种影响主要体现在负向风攻角,且表现为减小效应;对扭矩系数而言,这种影响主要体现在大风攻角,在正向和负向大风攻角时分别表现为放大效应和减小效应。To investigate the influences of the spacing and wind attack angles of the separated twin main girders on the aerodynamic interference effect of the three-component coefficients of the separated twin flat box girders,the sectional model for the flat box girders on the scale of 1∶50 was prepared and the wind tunnel tests for the model were carried out.The three-component coefficients of the girders of the 15 different spacing（the variation range of the net spacing D of the twin box girders to the width Bof the single box girder being 0.025~6）at the wind attack angles ranging from-10°to 10°were tested and the test coefficients were compared to the three-component coefficients of the single flat box girder.The results demonstrate that the influences of the aerodynamic interference on the three-component coefficients of the separated twin flat box girders mainly manifest themselves in the influences on the box girder on the downstream side.For the drag coefficients,the influences are mainly presented in the spacing range of the D/B≤1 and are presented as the reduced effect,for the lift coefficients,the influences are mainly presented in the negative wind attack angles and are presented as the reduced effect and for the torque coefficients,the influences are mainly presented in the large wind attack angles and are respectively presented as the amplified and reduced effects at the positive and negative large wind attack angles.

关 键 词：双扁平箱梁 三分力系数 气动干扰 双主梁间距 风攻角 节段模型 风洞试验 

分 类 号：U443.35[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]