悬挑人行道对π型叠合梁涡振的影响及气动措施优化风洞试验研究  

Influence of Cantilever Sidewalk on Vortex-Induced Vibrations ofπ-Shaped Composite Deck and Wind Tunnel Tests for Aerodynamic Performance Optimization

作　　者：黄钰婵 陈强草 陈富军 李高鹏 温青[3,4] HUANG Yuchan;CHEN Qiangcao;CHEN Fujun;LI Gaopeng;WEN Qing(Shenzhen Expressway Co.,Ltd.,Shenzhen 518057,China;Guizhou Guishen Investment Development Co.,Ltd.,Longli 551200,China;College of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]深圳高速公路集团股份有限公司,广东深圳518057 [2]贵州贵深投资发展有限公司,贵州龙里551200 [3]湖南科技大学土木工程学院,湖南湘潭411201 [4]湖南大学土木工程学院,湖南长沙410082

出　　处：《世界桥梁》2025年第2期66-72,共7页World Bridges

基　　金：国家自然科学基金项目(52378511)。

摘　　要：为研究悬挑人行道对π型断面钢-混叠合梁(简称π型叠合梁)涡振性能的影响、优化悬挑人行道布置位置和气动措施,以某大跨π型叠合梁斜拉桥为背景,开展无悬挑人行道和3种带悬挑人行道的π型叠合梁节段模型风洞试验,对比分析悬挑人行道对主梁涡振性能的影响,对下稳定板抑振气动措施进行优化。结果表明:π型叠合梁极易发生竖向涡振,在主梁两侧增加悬挑人行道可以有效减小π型叠合梁的涡振振幅;随着悬挑人行道板和桥面板之间的高差增大,主梁涡振振幅随之减小,悬挑人行道越靠近主纵梁中部,抑振效果越好;下稳定板气动措施可以有效抑制带悬挑人行道π型叠合梁的竖向涡振,两侧稳定板气动措施的抑振效果优于中央稳定板,可使涡振几乎消失。This study investigates the effects of cantilever sidewalk on the vortex-induced vibrations(VIVs)of the composite deck composed ofπ-shaped steel girder and concrete slabs(π-shaped composite deck hereafter),and suggestions for effective location of the cantilever sidewalks and aerodynamic measures are given.With the prototype of a long-span cable-stayed bridge withπ-shaped composite deck,wind tunnel tests were carried out on the sectional model in four scenarios of cantilever sidewalk arrangement,including the scenario without cantilever sidewalks and three scenarios of cantilever sidewalks at different locations,based on which,the effects of cantilever sidewalks on the VIVs of the deck were compared and analyzed,and the plan of using lower stabilizers to suppress VIVs was optimized.It is concluded that theπ-shaped composite deck is vulnerable to vertical VIVs,adding cantilever sidewalks to the deck can effectively mitigate the amplitude of vertical VIVs.The higher the location of the cantilever sidewalk against the deck,the lower the amplitude of the VIVs of the deck.When the cantilever sidewalk is installed close to the mid-depth of the stringer of theπ-shaped steel girder,the suppression effect of VIVs in the deck is the best.Adding lower stabilizers can effectively suppress the VIVs ofπ-shaped composite deck with cantilever sidewalks,and the suppression effect of adding stabilizers on both sides of the composite deck is better than adding central stabilizer,which can even lead to almost the total suppression of VIVs in the deck.

关 键 词：斜拉桥 π型叠合梁 涡振 悬挑人行道 下稳定板 风洞试验 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U448.216[交通运输工程—道路与铁道工程] U441.3