铁道标准设计2026，Vol.70Issue(8)：73-81,9.DOI:10.13238/j.issn.1004-2954.202411290001
公铁双层矮塔斜拉桥塔区遮蔽效应研究
Study on Shielding Effect in Tower Region of a Double-Deck Rail-Cum-Road Cable-Stayed Bridge with Low Towers
摘要
Abstract
[Objective]This study aims to study the shielding effect of the bridge tower in a double-deck rail-cum-road cable-stayed bridge with low towers.[Methods]Computational fluid dynamics(CFD)was utilized to simulate the wind environment in the tower region.Two critical parameters,namely the wind speed coefficient and the instantaneous wind speed fluctuation rate,were introduced to analyze the wind environment in the tower region under the tower-beam consolidation system and to examine the influence of various bridge tower cross-sections on the wind environment.The results revealed significant differences in the wind environments between the highway and railway tower regions.[Results]The wind environment in the highway tower region was more stable than that in the railway tower region,and the instantaneous wind speed fluctuation rates in both regions exhibited relatively small changes with height.The shielding effect of the bridge tower on the highway bridge deck intensified with increasing height,with lane 3 being the most adversely affected.The wind speed coefficient on the railway bridge deck did not vary significantly with height,and the downline was most impacted by the shielding effect in the tower region,which had a significant impact on driving safety.[Conclusion]In the highway wind environment,rounded bridge towers can mitigate abrupt changes in the wind speed coefficient in the tower region.In the railway wind environment,both rounded and chamfered bridge towers can effectively reduce such abrupt changes in the wind speed coefficient within the tower region.关键词
公铁两用桥梁/桥塔遮蔽效应/气动特性/数值计算/风速系数Key words
rail-cum-road bridge/shielding effect of bridge tower/aerodynamic characterist-ics/numerical simulation/wind speed coefficient分类
交通工程引用本文复制引用
周亮亮,周宪东,刘芝东,马存明,陈天瑀..公铁双层矮塔斜拉桥塔区遮蔽效应研究[J].铁道标准设计,2026,70(8):73-81,9.基金项目
国家自然科学基金项目(52078438) （52078438）
国家重点研发计划课题(2022YFC30053001) （2022YFC30053001）
