【摘要】 研究目的：高海拔深切峡谷山区地形复杂多变，其风场具有明显的三维空间分布特征，给大跨悬索桥施工带来巨大的安全风险。本文基于典型深大峡谷山区风非均匀特性，提出加劲梁上线性变化的等效静阵风风速分布模型，然后以高海拔山区深切峡谷中某千米级主跨铁路悬索桥加劲梁吊装施工为工程背景，建立空间有限元模型进行大节段加劲梁吊装架设阶段的倒拆分析，对合理成桥状态和施工过程中非均匀风载对关键构件的受力和变形的影响进行对比分析。研究结论：（1）非均匀分布的峡谷风对大节段钢桁梁吊装施工过程中悬索桥结构受力和变形的影响很小；（2）梁段间临时连接方式主要受竖向力控制，非均匀风载不影响临时铰处下弦杆开口间隙变化和刚接时机；（3）与相应均匀风工况相比，非均匀风荷载下临时铰轴力增大10%，剪力增大1倍，需要在设计中关注；（4）本研究成果可为非均匀分布的峡谷风对大节段吊装施工过程中结构的影响分析提供参考。更多还原

【Abstract】 Research purposes: The random variability of mountainous deep-cutting gorge terrain causes a 3D wind profile at bridge sites, and the complicated wind characteristics result in considerable risk to the construction of large-span suspension bridges. Based on the non-uniform wind characteristics in typical deep-cutting gorges, a linearly varying distribution model of equivalent static gust wind speed was firstly proposed for the stiffening girders. The erection of stiffening girders was then analyzed for the construction of a kilometer-span railway suspension bridge located in the deep gorges of a high-altitude region at the Sichuan-Tibet border. A spatial finite element model of the suspension bridge was also established to conduct reverse analysis during the erection stage of large-segment stiffening girders. A comparative analysis was conducted on the impact of non-uniform wind loads on the stress and deformation of key structural components, both in the reasonable completed bridge state and during the construction process.Research conclusions:(1) The non-uniform wind loads have slight influence on the structural response of the suspension bridge during the large-segment erection process.(2) As the temporary connections between girder segments are primarily governed by vertical force control during large-segment erection, the non-uniform wind load has no effect on the the gap at the lower chord of the temporary hinges or the timing of achieving rigid connections.(3) However, compared to the uniform wind load scenario, the non-uniform wind load results in a 10% increase in axial forces and a double increase of shear forces at the temporary hinges, which necessitates careful consideration in the design of temporary hinges.(4) This research provides a reference for analyzing the impact of non-uniform gorge wind on structures during large-segment erection construction.更多还原