Abstract The construction of the viaduct of the Nouvelle Route du Littoral, connecting Saint-Denis to La Grande Chaloupe in La Réunion, is particularly challenging in terms of the wind environment. In addition to being built in a cyclonic region, the 5.4 km long viaduct is being built in open sea, 100–150 m from the coast. The gust wind speed can reach up to 64 m/s at deck level during a cyclonic event. The height (10 m) and length (270 m) of the double truss launching girder make it particularly sensitive to turbulent wind and induce significant additional wind load on the viaduct and the cantilever under construction during a cyclonic event. The 120 m span and relatively large width (28 m) of the deck also play an important part in the dynamic response of the whole structure. This paper presents how the local wind conditions and the aerodynamic properties of the deck and the launching girder were determined. The methodology used to perform the time history simulations of the viaduct during the construction phase are then described, as well as the main results for the studied configurations.

中文翻译：

---

在气旋区域建造带有发射梁的高架桥

摘要 连接圣丹尼斯和留尼汪岛的 La Grande Chaloupe 的 Nouvelle Route du Littoral 高架桥的建设在风环境方面尤其具有挑战性。除了建在气旋区域外，这条 5.4 公里长的高架桥还在公海建造，距离海岸 100-150 m。在气旋事件期间，甲板层的阵风风速可高达 64 m/s。双桁架发射梁的高度 (10 m) 和长度 (270 m) 使其对湍流风特别敏感，并在气旋事件期间对正在建造的高架桥和悬臂产生显着的额外风荷载。120 m 的跨度和较大的桥面宽度（28 m）也对整个结构的动力响应起到了重要作用。本文介绍了如何确定局部风况以及甲板和发射梁的空气动力学特性。然后描述了用于在施工阶段执行高架桥时程模拟的方法，以及研究配置的主要结果。