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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第9卷    第2期    总第46期    2012年4月

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文章编号:1672-7029(2012)02-0018-06
大跨度平屋盖结构风致破坏过程模拟
田玉基,杨娜,杨阳

(北京交通大学土木建筑工程学院,北京100044)

摘 要: 利用计算流体动力学( CFD) 软件CFX11.0,采用基于雷诺平均( RANS) 方法的SST k-ω 湍流模型对大跨度平屋盖风致破坏过程进行了二维数值模拟,研究风致连续破坏过程中屋盖开口附近风压系数的变化规律。结果表明,大跨度屋盖边缘等几何外形突变的部位是屋盖的薄弱环节,屋盖的风致破坏往往由这些部位开始。屋盖破坏过程中破坏开口边缘处风压发生较大变化,这是屋盖风致连续破坏的主要原因。此外,结构前后入口的大小也对破坏开口外表面风压系数分布规律有较大影响。本文定性地对屋盖结构风致破坏过程进行了数值模拟分析,可为大跨度屋盖局部抗风设计提供参考。

 

关键字: 大跨度屋盖; 风致连续破坏; 风压系数; 计算流体动力学; 数值模拟

Analysis on wind-induced continuous damage of the long-span roof structures
TIAN Yu-ji,YANG Na,YANG Yang

School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China

Abstract:Using the SST k-ω turbulence model,the numerical simulation of wind-induced continuous damage of a 2D long-span roof structure was conducted by CFX11.0 to investigate the external and internal wind pressure coefficients near the opening hole.It is demonstrated that the protuberant components,such as the eaves and the corners of a long-span roof,are the weakly-resisted wind locations and that the damage of the roof arises from these parts.During the damage processes,the wind pressure coefficients near the opening hole change dramatically,which is the main cause of the wind-induced continuous damage of the roof.In addition,the size of the entrance also influences wind pressure coefficients on the upper surface of the roof.This research provides a qualitative reference of wind-resistant design for the cladding loads of a long-span structure.

 

Key words: long-span roof; wind-induced continuous damage; mean pressure coefficient; computational fluid dynamics; numerical simulation

ISSN 1672-7029
CN 43-1423/U

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