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首页> 外文会议>Canadian Society for Civil Engineering annual conference >AERODYNAMIC BEHAVIOUR OF A SPLIT BRIDGE DECK SECTION FOR LONG SPAN BRIDGES
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AERODYNAMIC BEHAVIOUR OF A SPLIT BRIDGE DECK SECTION FOR LONG SPAN BRIDGES

机译：大跨度桥梁桥面断面的气动特性

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With the increase of the span of suspension bridges, aerodynamics plays an ever-increasingimportance in the selection of a deck profile. Functionality requirements of a suspension bridge dictatethat it must not only span lengths of over 2000m, but also must be able to facilitate multiple uses, such asrail and vehicular traffic.A new shape of split bridge deck consisting of multiple sections, which would confer a better stabilityagainst wind induced vibrations, was aerodynamically investigated. The deck consists of two traffic laneson the exterior sections and two railways on the middle sections, separated by three gaps. Airflowsimulations were performed on a reduced scale model at a Reynolds number of 8×105 for angles ofattack -5°, 0°, and 5°. The airflow around the multiple-gap deck section was more complicated, with theflow passing through the gaps, shifting from the top of the deck to the bottom and vice versa. The effect ofturbulence was modelled by 2D Reynolds Stress model. A triangular mesh with a no-slip boundarycondition for the bridge deck was used.With the increase in the number of gaps along the width of the proposed bridge deck, a more unstablepressure distribution on both upper and lower sections of the bridge decks was observed (CP = -0.8 to1.0) when compared with the standard split bridge deck. A significant reduction of aerodynamic lift force,which is responsible for inducing vibrations, was registered. The most unfavourable combination ofaerodynamic drag and lift forces was registered for angle of attack of 5°, for both types of deck sections.The proposed split deck outperformed the standard split deck when tested under same wind flowconditions, providing better stability in terms of reduced lift coefficients along with the reduction in thedrag coefficients.
机译：随着悬索桥跨度的增加，空气动力学起着越来越大的作用。 在选择甲板轮廓时的重要性。吊桥的功能要求决定了 它不仅必须跨度超过2000m，而且还必须能够促进多种用途，例如 铁路和车辆交通。 一种新型的分体式桥面甲板，由多个部分组成，具有更好的稳定性 对风引起的振动进行了空气动力学研究。甲板由两条行车道组成 在外部部分和两条铁路在中间部分，由三个间隙分开。空气流动 在雷诺数为8×105的缩小比例模型上进行了模拟，角度为 攻击-5°，0°和5°。多间隙甲板部分周围的气流更加复杂， 穿过缝隙的气流从甲板的顶部转移到底部，反之亦然。的效果 湍流通过2D雷诺应力模型建模。具有防滑边界的三角形网格 使用了桥面的条件。 随着沿提议的桥面板宽度方向上的缝隙数量的增加，更加不稳定 在桥面板的上部和下部均观察到压力分布（CP = -0.8至 1.0）与标准分体式桥面甲板相比。大大降低了气动升力， 负责引起振动的传感器已注册。最不利的组合 两种类型的甲板截面的气动阻力和升力均记录为5°的迎角。 在相同风速下进行测试时，建议的拼合板性能优于标准拼合板 在降低升力系数的同时，还提供了更好的稳定性。 阻力系数。

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