高陡山区大跨度钢箱梁悬索桥风致振动试验和气动外形优化  

Wind-induced vibration test and aerodynamic optimization of a long-span suspension bridge with steel box girder located in cliffy mountainous areas

作　　者：陈应高[1,2] 康佳 唐浩俊[1,3] 郑凯锋 李永乐[1,3] CHEN Yinggao;KANG Jia;TANG Haojun;ZHENG Kaifeng;LI Yongle(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Guizhou Provincial Traffic Planning,Survey and Design Institute Co.,Ltd.,Guiyang 550081;Wind Engineering Key Laboratory of Sichuan Province,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]贵州省交通规划勘察设计研究院股份有限公司,贵阳550081 [3]风工程四川省重点实验室,成都610031

出　　处：《振动与冲击》2023年第18期241-249,共9页Journal of Vibration and Shock

基　　金：四川省自然科学基金(2022NSFSC0004)。

摘　　要：为了掌握高陡山区大跨度钢箱梁悬索桥的抗风性能,以实际工程为背景,建立了桥梁的三维有限元模型并识别其模态特性;据此设计了节段模型并开展风洞试验,测试了桥梁在不同风攻角下的颤振性能;基于不同目标对钢箱梁的气动外形进行了优化设计,结合颤振临界风速和涡振性能对优化措施进行了评价。研究结果表明:较高的防撞护栏使该桥在正攻角来流下的颤振稳定性较差;在桥面中央设置竖向稳定板或在风嘴上设置导流板均能提高桥梁的颤振临界风速,但两种措施对桥梁的涡振有不同影响;设置稳定板后桥梁在正、负攻角下均存在发生涡振的可能,而设置导流板后桥梁仅在正攻角下存在发生涡振的可能,考虑到桥址区以负攻角来流为主,因此后者更具优势。In order to understand the wind-resistant performance of a long-span suspension bridge with steel box girder located in cliffy mountainous areas,a practical engineering project was taken as the analysis example.The three-dimensional finite element model of the bridge was established to extract the modal characteristics,and the sectional wind tunnel test was designed accordingly to test the flutter performance of the bridge at different angle of attack.The aerodynamic shape of the steel box girder was optimized in accordance with different aims,and the effectiveness of the countermeasures was evaluated based on the critical flutter wind speed and the vortex-induced vibration(VIV)performance.The results show that the bridge with higher crash barrier is of worse flutter stability at positive angles of attack.Setting the central vertical stabilizer on the bridge deck or the guide plate on the wind fairings could improve the critical flutter wind speed of the bridge.However,the two countermeasures have different effects on the VIV of the bridge.The set of the stabilizer makes the bridge have the possibility to produce VIV at both positive and negative angles of attack,while the set of the guide plate makes the bridge have the possibility to produce of VIV at positive angles of attack only.Considering that negative angles of attack are dominant for the bridge site,the latter countermeasure shows more advantages.

关 键 词：钢箱梁悬索桥 颤振性能 涡振性能 风洞试验 大风攻角 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]