倾斜角对独柱式变截面钢桥塔气动特性的影响  

Effect of Inclination Angle on Aerodynamic Characteristics of Single Column Steel Bridge Tower with Variable Cross-Section

作　　者：刘小兵[1,2,3] 姜会民 于文文 郑怡彤 LIU Xiaobing;JIANG Huimin;YU Wenwen;ZHENG Yitong(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,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]河北省风工程和风能利用工程技术创新中心,石家庄050043 [3]石家庄铁道大学土木工程学院,石家庄050043

出　　处：《振动．测试与诊断》2023年第6期1152-1157,1245,1246,共8页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(52078313,52008273);河北省自然科学基金资助项目(E2020210083);河北省高等学校科学技术研究资助项目(ZD2019118);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自主课题资助项目(ZZ2020-14)。

摘　　要：与竖直等截面桥塔相比,倾斜变截面桥塔在风的作用下往往表现出更为复杂的三维效应。以国内一座拟建的独柱式变梯形截面倾斜钢桥塔为工程背景,通过全桥塔刚性模型测压风洞试验,测试了该桥塔在不同风向角α和倾斜角β下的气动力系数和斯托罗哈数,研究了倾斜角对其气动特性的影响。研究结果表明:当α=0°(顺桥塔倾斜方向来流)和α=30°左右时,倾斜使桥塔上部截面的气动力减小,下部截面的气动力增大;当α=140°和α=180°(逆桥塔倾斜方向来流)左右时,规律与之相反。倾斜角的增大会使桥塔的旋涡脱落变得不明显。Compared with the vertical bridge tower with constant cross-section,the three-dimensional effect of inclined one with variable cross-section is more complex.Taking a single column inclined steel bridge tower as the engineering background,the aerodynamic force coefficients and Strouhal numbers of the bridge tower at dif-ferent incidence anglesαand inclination anglesβare measured by wind tunnel test of the rigid model of the en-tire bridge tower.The effect of the inclination angle on the aerodynamic characteristics of the pylon is analyzed.The results show that at approximatelyα=0°(inclined direction of the bridge tower flow)andα=30°,the incli-nation weakens the aerodynamic force on the upper sections of the bridge and enhances it on the lower sections.At approximatelyα=140°andα=180°(opposite inclined direction of the bridge tower flow),the opposite rule is observed.The increase of inclination angle makes the vortex shedding of the bridge tower gradually become in-conspicuous.

关 键 词：钢桥塔 风洞试验 倾斜角 气动力系数 斯托罗哈数 三维效应 

分 类 号：U441.2[建筑科学—桥梁与隧道工程] TH138[交通运输工程—道路与铁道工程]