并列双幅变截面箱梁阻力系数的干扰效应研究  

Study on interference effect on drag coefficient of twin parallel box girders with variable cross section

作　　者：刘小兵[1,2,3] 吴倩云 路起凡 刘慧杰 杨群 LIU Xiaobing;WU Qianyun;LU Qifan;LIU Huijie;YANG Qun(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,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;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学,省部共建交通工程结构力学行为与系统安全国家重点实验室,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 [4]石家庄铁道大学土木工程学院,石家庄050043

出　　处：《振动与冲击》2020年第10期148-153,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51308359);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项目。

摘　　要：基于节段模型风洞试验,对比研究了4种不同高宽比的并列双幅箱梁在不同风攻角和不同间距时的阻力系数与单箱梁阻力系数的差异。给出了阻力系数干扰因子(定义为双箱梁上游(或下游)箱梁阻力系数与单箱梁阻力系数的比值)随风攻角和间距变化规律。结果表明:上游箱梁阻力系数的干扰效应主要体现在D/B≤1的间距范围。高宽比对上游箱梁阻力系数干扰效应的影响不大。当0.025≤D/B≤1,风攻角为-10°~10°时,上游箱梁阻力系数干扰因子的变化范围为0.8~1.3左右;下游箱梁阻力系数的干扰效应表现为显著的减小效应。这种减小效应随着间距的减小和高宽比的增大愈发明显,与负向风攻角时相比,这种减小效应在正向风攻角时更明显。Wind tunnel tests of sectional models of twin parallel box girders with four different aspect ratios were performed. Drag coefficients of twin box girders in different spacings under different wind attacking angles were measured and compared with that of single box girder. Variation of interference factor which is defined as ratio of drag coefficients of twin box girders to that of single box girder with wind attacking angle and spacing were shown. The results show that interference effect on drag coefficient of forward box girder is noticeable only when D/B≤1 and is slightly affected by aspect ratio. Interference effect on drag coefficient of leeward box girder is obvious and shown as reducing effect. The reducing effect is more notable in small spacing and large aspect ratio. The reducing effect under positive wind attacking angles is more remarkable than that under negative wind attacking angles.

关 键 词：双幅变截面箱梁 风洞试验 阻力系数 干扰因子 间距 风攻角 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]