- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
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| Citation: | LI Yongle, YAN Tingyuan, ZHANG Mingjin, Ti Zilong, Yu Chuanjin, Wang Bin. Classification of Bridge Site Characteristics and Wind Field Characteristics of Large-Span Mountainous Bridges[J]. Journal of Southwest Jiaotong University, 2026, 61(3): 1031-1043. doi: 10.3969/j.issn.0258-2724.20260078
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In view of the diverse terrain types and highly variable spatial distributions of wind fields at bridge sites in complex mountainous terrain, engineering-identifiable terrain elements were taken as the main thread, and combined with research results such as field measurements and numerical simulations, a progressive classification framework based on “canyon cross-sectional morphology, canyon channel orientation, and special topography and geomorphology” was constructed. The influence laws of eight typical mountainous bridge site terrains (V-shaped/U-shaped/L-shaped cross-sections, Y-shaped/S-shaped orientations, and funnel-shaped contraction/reservoir-dam area/thermally driven wind) on relevant wind fields were clarified, and a comparative analysis was conducted combined with typical cases. The results indicate that the cross-sectional types determine lateral confinement and spatial non-uniformity; V-shaped deep-cut canyons have stronger near-surface boundary effects on sidewalls; the wind field in U-shaped deep and large canyons is more obviously constrained by channels; L-shaped canyons result in a non-uniform spatial distribution of the wind field under the influence of asymmetric terrains. Channel turning and confluence easily form acceleration and over-mountain transport; Y-shaped channels form a downstream acceleration zone accompanied by drastic variations in the vertical angle of attack; S-shaped sharp bends lead to wind speed enhancement after turning and reconstruction of the horizontal angle of attack. Among special geomorphologies, funnel-shaped contraction induces convergent strong winds; water level variation in reservoir-dam areas can cause large-angle-of-attack climbing in the near-dam area, while weakening the squeeze acceleration and smoothing the approach flow in the far field; thermally driven winds form clear diurnal cycle characteristics; the temperature difference over the underlying surface of snow mountains can enhance the convergence toward the valley floor. The constructed framework can support the rapid discrimination of wind environments and the identification of adverse working conditions at mountainous bridge sites and provides a reference for the wind-resistant design of mountainous bridges.
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