非均匀风下大跨分离式钢箱梁斜拉桥抖振分析  

Buffeting analysis of large-span cable-stayed bridge with separated steel box girder under non-uniform wind

作　　者：徐昕宇 李龙[3] XU Xinyu;LI Long(School of Energy and Power Engineering,Xihua University,Chengdu 610039,China;Key Laboratory of Fluid and Power Machinery of Ministry of Education,Xihua University,Chengdu 610039,China;Anhui Transport Consulting&Design Institute Co.,Ltd.,Hefei 230088,China)

机构地区：[1]西华大学能源与动力工程学院,四川成都610039 [2]西华大学流体及动力机械教育部重点实验室,四川成都610039 [3]安徽省交通规划设计研究总院股份有限公司,安徽合肥230088

出　　处：《交通科学与工程》2025年第2期63-69,共7页Journal of Transport Science and Engineering

基　　金：西华大学引进人才项目(Z241014)。

摘　　要：【目的目的】开展非均匀风下桥梁抖振响应的精细化分析,指导复杂地形区大跨度桥梁运维。【方法方法】为深入探讨非均匀风分布对大跨度桥梁抖振响应的影响规律,以大跨度分离式钢箱梁斜拉桥为研究对象,采用有限元方法建立全桥结构模型,开展不同分布形式下桥梁抖振响应时域分析,并与风速均匀分布情况进行对比。【结果结果】与全桥风速均值的均匀分布情况相比,当主梁风速分布为抛物线形式时,非均匀分布显著增加了桥梁的横桥向位移、竖桥向位移和扭转角响应均方根值,均匀分布的分析结果会在较大程度上低估桥梁的实际响应,主跨跨中响应受主跨范围内风速分布的影响较大,在不同抛物线分布下,竖桥向响应差异最显著;当主梁风速分布为线性形式时,竖桥向位移和扭转角响应有所增大,由于一侧风速大,边跨扭转角明显增大,其值与跨中扭转角接近,均匀分布的结果会低估线性分布时桥梁的实际响应。【结论结论】在复杂地形区进行桥梁抖振响应研究时,应重点关注大桥关键位置的风速和非均匀风的分布形式。[PurposesPurposes]The paper aims to conduct a detailed analysis regarding the buffeting responses of a bridge under non-uniform wind,and guide the operation and maintenance of long-span bridges in complex terrain areas.[MethodsMethods]To investigate the effect of non-uniform wind distribution on the buffeting responses of long-span bridges,this study took a long-span cable-stayed bridge with a separated steel box girder as the research object and established a bridge structural model by using the finite element method.A time-domain analysis of buffeting responses of the bridge was conducted under different non-uniform distribution forms,and the results were compared with those under the scenario of uniform wind speed distribution.[FindingsFindings]Compared to uniform distribution of average wind speed along the bridge,the parabolic wind speed distribution along the bridge significantly increases the root mean square values of lateral displacement,vertical displacement,and torsion angle of the bridge.The results under uniform distribution would greatly underestimate the actual responses of the bridge.The responses at the mid-span are greatly influenced by wind speed distribution within the main span range,and the differences in vertical response are most significant under different parabolic distributions.When the wind speed distribution along the bridge is linear,both vertical displacement and torsion angle responses increase.Due to the high wind speed on one side,the torsion angle at side span increases significantly,which is close to that at the mid-span.The results obtained under uniform wind speed distribution underestimate the actual responses of the bridge under linear distribution.[ConclusionsConclusions]The wind speeds at important positions of the bridges and the distribution forms of non-uniform wind should be focused on when buffeting responses of bridges in complex terrains are studied.

关 键 词：斜拉桥 分离式钢箱梁 抖振 非均匀风 风速分布 时域分析 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]