护栏位置对流线型箱梁涡激振动的影响及作用机理  

Effect on vortex induced vibration of the guardrails’locations of a streamline box girder and the driving mechanism

作　　者：李震 刘庆宽 靖洪淼[1,2,3] 孙一飞 王仰雪 LI Zhen;LIU Qingkuan;JING Hongmiao;SUN Yifei;WANG Yangxue(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,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]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

出　　处：《振动与冲击》2023年第6期1-7,15,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51778381);河北省自然科学基金(E2018210044);河北省高端人才(冀办[2019]63号);河北省青年科学基金(E2021210063);石家庄铁道大学研究生创新资助项目(YC2021018)。

摘　　要：涡激振动(vortex induced vibration,VIV)是大跨度桥梁常发生的一种振动,易造成结构疲劳破坏,掌握主梁外形对涡激振动的影响十分必要。为了研究不同位置桥侧护栏对闭口流线型箱梁涡激振动特性的影响及作用机理,通过节段模型风洞试验,分别研究了桥侧护栏位置下主梁的涡激振动响应、风压分布、升力系数、气动力相位差及涡激振动贡献系数。研究结果表明,迎风侧护栏内移有利于抑制竖弯涡激振动,但背风侧护栏内移会略微增大涡激振动响应。迎风侧护栏内移会降低主梁升力绝对值,增加气动力相位差的离散性,也降低各位置的涡激振动贡献系数,这被认为是涡激振动被抑制的原因。Vortex induced vibration(VIV)is easy to occur in long-span bridges,resulting in structural fatigue damage.It is necessary to grasp the influence of the girder shape on VIV.To investigate the influence of the guardrail at different locations on VIV characteristics of a streamline box girder and its mechanism,the vortex induced vibration response,wind pressure distribution,lift coefficient,aerodynamic phase difference and vortex induced vibration contribution coefficient of the bridge side railing at five locations were studied through segmental model wind tunnel tests.The experimental results show that the inward movement of the railing on the windward side is beneficial to suppress the vertical bending VIV,while the inward movement of the railing on the leeward side will slightly increase the VIV response.The inward movement of the railing on the windward side will reduce the absolute value of the lift of the main beam,increase the dispersion of aerodynamic phase difference,and also reduce the contribution coefficient of vortex induced vibration at each position,which is considered to be the reason of the suppression of VIV.

关 键 词：涡激振动(VIV) 桥梁护栏位置 风洞试验 气动力相位差 涡激振动贡献系数 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]