大跨人行悬索桥纵横主梁涡振性能研究  

Study on Vortex Vibration Performance of Vertical and Horizontal Girder of Large-Span Pedestrian Suspension Bridge

作　　者：李玉学 马草原[1] 李海云 Li Yuxue;Ma Caoyuan;Li Haiyun(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;Key Laboratory of Roads and Railway Engineering Safety Control of China Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]河北省风工程与风能利用工程技术创新中心,河北石家庄050043 [3]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043

出　　处：《石家庄铁道大学学报（自然科学版）》2023年第2期7-13,共7页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金(51278314);河北省自然科学基金(E2019210031);中央引导地方科技发展资金项目(206Z5401G);北京交通大学“结构风工程与城市风环境北京市重点实验室”开放课题(2023-1)。

摘　　要：为掌握大跨人行悬索桥纵横主梁涡振性能,以国内拟建的一座宽跨比为0.0284的人行悬索桥为工程背景,对其涡振响应特性及发生机理进行了研究。采用数值方法分析了该主梁涡振响应、流场涡脱演化、风压分布以及涡激振动贡献系数在-3°、0°和3°风攻角下的特性。结果表明,随着风攻角由正转负,主梁竖弯涡振性能变差,其风速锁定区间向低风速区偏移,最大竖弯涡振幅值增大,最不利扭转涡振出现在0°风攻角下。由于主梁下表面多个工字钢纵梁的阻挡作用,导致主梁下部气流旋涡运动状态复杂,其对涡振响应影响显著。脉动风压系数随风攻角的变化规律复杂,主梁上、下表面脉动风压系数极值分别出现在-3°和3°风攻角下。不同风攻角下,主梁上、下表面的涡激振动正贡献系数极值均出现在尾流端且作用范围较大,此为结构竖弯涡振响应的主要贡献区域。In order to grasp the vortex-induced vibration performance of the vertical and horizontal girder of the large-span ratio pedestrian suspension bridge,the vortex-induced vibration response and its occurrence mechanism of the width-span ratio of 0.0284 bridge were studied.The vortex-induced vibration response,flow field vortex evolution,wind pressure distribution and vortex-induced vibration contribution coefficient at-3°,0°and 3°wind attach angles were analyzed.The results show that with the wind attach angles changing from positive to negative,the vertical bending vortex-induced vibration performance deteriorates,the lock-in region of wind speed shifts to the low wind speed region,the maximum vertical bending vortex-induced vibration amplitude increases,and the most unfavorable torsional vortex-induced vibration occurs at 0°.The complex airflow vortex motion has a significant effect on the vortex vibration response in the lower part of the girder by the blockage of I-beam.The fluctuating wind pressure coefficient changes complexly with wind attack angle,the extreme values appear at-3°and 3°respectively.Under different wind attack angles,the extreme values of vortex-induced vibration positive contribution coefficient appears at the wake end and have a large range of action on the upper and lower surfaces,which is the main contribution area of the structure.

关 键 词：人行悬索桥 纵横主梁 涡振响应 涡振机理 流场演化 

分 类 号：U448.11[建筑科学—桥梁与隧道工程] U448.25[交通运输工程—道路与铁道工程]