不同抗风索措施对大跨度三主桁钢桁拱桥最大单悬臂施工状态抖振响应的影响  

Effect of Different Wind-resistance Cables'Measures on the Buffeting Response of the Longest Cantilever of Three Truss Steel Arch Bridge with Long Span during Construction

作　　者：唐煜[1] 田野[1] 景聪 陶庆东[2] TANG Yu;TIAN Ye;JING Cong;TAO Qing-dong(School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu 610000, China;Department of Architectural Engineering, Mianyang Polytechnic, Mianyang 621000, China)

机构地区：[1]西南石油大学土木工程与测绘学院,成都610000 [2]绵阳职业技术学院建筑工程系,绵阳621000

出　　处：《科学技术与工程》2022年第8期3285-3293,共9页Science Technology and Engineering

基　　金：国家自然科学基金(51808470);湖南省教育厅科学研究项目(18K012)。

摘　　要：为保证施工人员以及桥梁结构的安全,将施工期大跨度钢桁拱桥的抖振位移降低至工程可以接受的范围内,以一座处于沿海强风区的施工期大跨度三主桁钢桁拱拱桥为工程背景,依据大桥施工期面临的不利条件选取最大单悬臂施工状态作为抗风研究工况,通过谐波合成法生成三维脉动风场,基于ANSYS建立最大单悬臂施工状态的桥梁结构有限元模型。开展三维抖振分析,并考查不同方式布置的抗风索对施工期桥梁抖振的影响。研究结果表明:大桥的竖向振动位移的均方根值和峰值显著高于横向振动位移的均方根值和峰值;在大桥双侧拱肋悬臂端之间上下交错布设6根抗风索时,大桥的竖向抖振位移显著降低,其中大桥拱肋悬臂端的竖向位移均方根值相比未采用抗风索措施时降低了65.35%,抖振控制效果十分明显,可作为推荐方案。可见研究结果可为类似钢桁拱桥施工过程中的抗风措施选取提供一定的参考依据。In order to ensure the safety of construction teams and bridge structures during construction and ensure that the buffeting displacement of the long-span steel truss arch bridge during construction can be reduced to an acceptable range.Taking a long-span three truss steel arch bridge in coastal strong wind area as the engineering background,according to the adverse conditions faced by the bridge during construction,the maximum single cantilever construction state was selected as the wind resistance research condition.Three-dimensional numerical simulation of the wind field by harmonic synthesis,the finite element model based on ANSYS and three-dimensional buffeting analysis were used to investigate the effect of different setting-up of wind-resistance cables on the buffeting of bridge during construction.The results show that the root mean square and peak level of the vertical displacement of the bridge stand significantly higher than that laterally.When six interwoven wind-resistance cables are set up to connect both sides of the cantilever,the vertical displacement of the bridge reduces markedly,representing 65.35%compared with cable-free situation.It could be observed that wind-resistance cables work very well in terms of the control of buffeting displacement.Therefore,the research results provide some reference for wind resistance measures of similar steel arch bridges.

关 键 词：大跨度钢桁拱桥 抖振 抗风措施 抗风索 

分 类 号：TU997[建筑科学—市政工程]