摘要
为了研究扁平流线型箱梁涡激振动及气动力特性受附属构件的影响,选取某准流线型桥梁主梁为研究对象,通过增减模型的附属构件来模拟裸梁和非裸梁2种断面,进行了不同风攻角下的风洞测压和测振试验。结果表明:扁平流线型箱梁的涡激振动特性受模型附属构件的影响较大,栏杆断面在正攻角下更易发生涡激振动;在相同攻角和风速情况下,栏杆断面存在更为明显的卓越频率,说明模型附属构件会对扁平流线型箱梁的旋涡脱落产生较大影响;扁平流线型箱梁平均风压系数受模型断面的影响较大,但脉动风压系数受模型断面和风攻角的共同影响;不同模型断面会对扁平流线型箱梁的平均三分力系数造成影响,但其变化趋势主要与风攻角有关。
In order to find out the influence of the attached components on the vortex induced vibration and aerody-namic characteristics of flat streamlined box girder,the main girder of a quasi streamlined bridge is selected as the research object.By increasing or decreasing the attached components of the model to simulate the bare beam and non bare beam sections,the wind tunnel pressure and vibration tests are carried out under different wind attack an-gles.The results show that the vortex induced vibration characteristics of the flat streamlined box girder are greatly affected by the auxiliary components of the model,and the railing section is more prone to vortex induced vibration at the positive angle of attack.At the same angle of attack and wind speed,there is a more obvious predominant fre-quency of the railing section,which indicates that the attached components of the model will have a greater impact on the vortex shedding of the flat streamlined box girder.The average wind pressure coefficient of flat streamlined box girder is greatly affected by the model section,but the fluctuating wind pressure coefficient is affected by the model section and wind attack angle.Different model sections will affect the average three component force coeffi-cient of flat streamlined box girder,but its variation trend is mainly related to the wind attack angle.
作者
任若松
刘庆宽
李震
孙一飞
靖洪淼
REN Ruosong;LIU Qingkuan;LI Zhen;SUN Yifei;JING Hongmiao(Hebei Branch of China Nuclear Power Engineering Co.,Ltd.Shijiazhuang,050051,China;School of Civil Engineering,Shijiazhuang Tiedao University Shijiazhuang,050043,China;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)
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2023年第3期572-577,624,共7页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(51778381)
河北省自然科学基金资助项目(E2022210078)
河北省高端人才资助项目(冀办[2019]63号)。
关键词
风洞试验
准流线型桥梁断面
涡激振动
压力系数
三分力系数
wind tunnel test
quasi-streamline box girder
vortex induced vibration
pressure coefficient
aero-dynamic force coefficient
