山区Y形河口附近桥址区地形风特性数值模拟研究

李永乐; 遆子龙; 汪斌; 廖海黎

doi:10.3969/j.issn.0258-2724.2016.02.013

山区Y形河口附近桥址区地形风特性数值模拟研究

doi: 10.3969/j.issn.0258-2724.2016.02.013

基金项目:

国家自然科学基金资助项目(U1334201,90915006)

交通运输部建设科技计划资助项目(2014318800240)

四川省青年科技创新研究团队项目资助(2015TD0004)

详细信息

作者简介:
李永乐(1972-),教授,博士,博士生导师,1998年起至今任职于在西南交通大学土木工程学院,现任桥梁工程系副主任.E-mail:lele@swjtu.edu.cn;遆子龙(1989-),2014级博士研究生.研究方向为大跨桥梁的空气动力学,海洋桥梁的波浪动力学.Email:swjtutzl@126.com

李永乐(1972-),教授,博士,博士生导师,1998年起至今任职于在西南交通大学土木工程学院,现任桥梁工程系副主任.E-mail:lele@swjtu.edu.cn;遆子龙(1989-),2014级博士研究生.研究方向为大跨桥梁的空气动力学,海洋桥梁的波浪动力学.Email:swjtutzl@126.com

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出版历程
- 收稿日期: 2015-11-30
- 刊出日期: 2016-04-25

Numerical Simulation of Wind Characteristics over Bridge Site Near Y-shaped River Junction in Mountainous Area

摘要

摘要: 为研究在山区Y形河口影响下桥址区的桥梁风载特性,以山区峡谷大跨度悬索桥桥址区真实地形为工程背景,应用CFD(computational fluid dynamics)的方法,建立了桥址区复杂地形区域风场数值模型.通过36个工况的分组对比分析,探讨了山区Y形河口对主梁的平均风速、风攻角、风剖面以及风速放大系数在不同来流方向下的影响规律,并分析了河口处河道的导流与山体的绕流作用.研究结果表明:不同于普通深切峡谷地形风特性,在Y形河口影响下,桥址区附近的平均风速最大增幅达24 m/s,平均风攻角主要表现为负攻角,出现了最高达1.13的风速放大系数,且河道的导流及山体的绕流作用会导致主梁风速分布不均匀.
- Y形河口 /
- 地形影响 /
- 峡谷 /
- 桥梁 /
- 风工程
Abstract: To study the wind field characteristics in bridge site under the influence of Y-shaped river junction in mountainous areas, a long-span suspension bridge built over a deep-cutting gorge near a Y-shaped river junction is regarded as a typical example and a numerical model for the wind field distribution of the bridge site with complex terrain is established by computation fluid dynamics (CFD) method. According to comparative analysis of 36 cases in different groups, the influence laws of Y-shaped river junction on the average wind velocity, wind attack angle, wind profile, and wind velocity amplification factor along the bridge deck in different flow directions are discussed, and the effect of river diversion and flow around mountains at the junction are analyzed. The results show that unlike the wind characteristics in ordinary deep gorges, influenced by Y-shaped river junction, the maximum increase in the average wind velocities is up to 24m/s, the wind attack angles are mainly negative, and a large velocity amplification factor up to 1.13 occurs. The effect of river diversion and flow around mountains at the junction can lead to a large wind velocity difference on beam.
- Y-shaped river junction /
- terrain influences /
- gorge /
- bridge /
- wind engineering

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参考文献(13)

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文章访问数: 651
HTML全文浏览量: 76
PDF下载量: 359
被引次数: 0

山区Y形河口附近桥址区地形风特性数值模拟研究

doi: 10.3969/j.issn.0258-2724.2016.02.013

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出版历程

Numerical Simulation of Wind Characteristics over Bridge Site Near Y-shaped River Junction in Mountainous Area

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出版历程

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