不同风嘴形式的大跨度分体箱梁桥梁颤振性能  

Flutter performance of long-span twin-box girder bridges with different wind fairing forms

作　　者：杨詠昕[1] 周锐[1] 李渊[1] 葛耀君[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《振动工程学报》2015年第5期673-682,共10页Journal of Vibration Engineering

基　　金：科技部国家重点基础研究计划(973计划)(2013CB036300);国家自然科学基金资助项目(51078276;91015013);交通行业重点实验室自主课题(KLWRBMT-04);国家重点实验室自主课题(SLDRCE10-B-05)

摘　　要：分体箱梁可以有效地改善整体式钢箱梁断面的气动稳定性能,但不同的风嘴类型对分体箱梁的颤振稳定性能改善程度不同。通过节段模型风洞试验对两种风嘴形式的分体箱梁的颤振性能随槽宽演化规律进行了研究,将其与Larsen,Sato和作者前期的研究结果进行了对比,并从结构动力特性参数和气动外形两个关键方面解释了研究结果差异的原因。结果表明,不对称风嘴形式分体箱梁的颤振稳定性能对槽宽比的变化比较敏感,存在一个"最优槽宽比";对称风嘴形式分体箱梁对槽宽比的变化相对不太敏感,特别是当槽宽比较大时。与Larsen研究结果的差异主要是由结构及动力特性参数的改变造成的,其中质量惯矩的增大和扭弯比的减小起到了重要作用;与Sato研究所得结论的差异则主要源于气动外形的不同,特别是高宽比的改变。Twin box girder could effectively improve the aerodynamic stability of the cross sections of integral steel box girders.However,different wind fairing forms make various contributions to the flutter stability of the twin box girder.In this study,the relation between the flutter characteristics and the slot width of the twin box girder for two fairing forms is investigated through wind tunnel tests using the section models.Then the experimental results are compared with the research results of Larsen′s,Sato′s and the former ones of the author′s.The reasons for the discrepancy among these results are analyzed from two critical aspects of the structural dynamic characteristic parameters and the aerodynamic configurations.Results show that the flutter characteristics of the twin box girder with the asymmetric wind fairing is sensitive to the slot-width ratio which is opposite to the twin box girder with the symmetric wind fairing,especially for the case of relative large slot-width ratio.The discrepancy of these study results between this paper and Larsen′s is attributed to the structural dynamic parameters,where the increase of the mass moment of inertia and the decrease of the torsion-bending moment ratio play an important role.The discrepancy between the results of this paper and Sato′s is attributed to the aerodynamic configurations,especially the change of depth-width ratio.

关 键 词：桥梁 分体箱梁 颤振性能 风嘴形式 动力特性参数 

分 类 号：U442.54[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]