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Vortex-induced vertical vibrations on twin box sections

机译:涡流在双箱形截面上引起的垂直振动

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Vortex shedding from bridge decks can lead to significant aerodynamic excitation of the structure.rnThis is a limited amplitude phenomenon, which however can be critical to the serviceability of thernbridge or lead to fatigue damage. For structures sensitive to vortex shedding an adequately realisticrnassessment of the problem is required.rnA particularly challenging case is presented by twin boxes, where wake effects form the upstreamrnsection can affect or even cause vortex-induced oscillations. The upper steel arch bridge ofrnAlconétar (2006, Cáceres, Spain, 220 m main span) has suffered from such excitation phenomena.rnNumerical simulations of the fluid flow provide a further method for modelling the physicalrnproblem. Such methods are gaining popularity in the field of civil engineering because of theirrngrowing reliability provided by the implementation of new computational methods and thernavailability of more powerful computational resources.rnThis paper presents computational fluid dynamics simulations of the vortex-induced verticalrnvibrations of twin sections using the Vortex Particle Method. Different excitation mechanisms arerndescribed and the case of the Alconétar Bridge is studied.
机译:桥面板上的涡流脱落会导致结构产生明显的空气动力学激励。这是一个有限的振幅现象,但是这对桥梁的可维修性至关重要或导致疲劳损坏。对于对涡旋脱落敏感的结构,需要对问题进行足够现实的评估。双箱提出了一种特别具有挑战性的情况,其中上游截面的尾流效应会影响甚至引起涡旋诱发的振荡。阿尔科内塔尔(Alconétar)的上部钢拱桥(2006年,西班牙卡塞雷斯,主跨220 m)遭受了这种激励现象。流体流动的数值模拟提供了进一步建模物理问题的方法。由于通过新的计算方法的实现以及日益强大的计算资源的可用性,这种方法在可靠性方面日益增长,因此在土木工程领域越来越受欢迎。本文介绍了利用涡旋对双截面涡流引起的垂直振动的计算流体动力学模拟。粒子法。描述了不同的激励机制,并研究了Alconétar桥的情况。

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