不同风嘴形式的大跨度分体箱梁桥梁颤振性能

发布时间：2018-04-12 16:12

本文选题：桥梁 + 分体箱梁　；参考：《振动工程学报》2015年05期

【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。
[Abstract]:Split box girder can effectively improve the aerodynamic stability of integral steel box girder section, but the flutter stability performance of separated box girder is improved by different types of wind nozzles.In this paper, the flutter performance of two kinds of wind nozzles with split box girders with slot width is studied by wind tunnel test with segmental model, and the results are compared with those of Larsen Sato and the previous research results of the authors.The reasons for the difference of the results are explained from two key aspects: the structural dynamic characteristic parameters and the aerodynamic shape.The results show that the flutter stability of the split box girder with asymmetric wind nozzles is sensitive to the variation of the slotted width ratio, and there exists an "optimal slotted width ratio", while the split box girder with the symmetrical wind nozzles is less sensitive to the variation of the slotted width ratio.Especially when the slot width is large.The difference between the results of Larsen and that of Larsen is mainly caused by the change of structure and dynamic characteristic parameters, in which the increase of mass moment of inertia and the decrease of torsional bending ratio play an important role, and the difference with the conclusion of Sato study is mainly due to the difference of aerodynamic shape.In particular, the aspect ratio changes.
【作者单位】：同济大学土木工程防灾国家重点实验室;
【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)
【分类号】：U441.3

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