横风作用下高速铁路桥梁全封闭声屏障气动特性的风洞试验研究
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摘要
为研究高速铁路桥梁全封闭声屏障的横风气动特性,通过节段模型风洞试验对全封闭声屏障的三分力和表面风压进行了测试,分析了风速、雷诺数效应、风攻角、侧视断面位置对全封闭声屏障气动特性的影响。结果表明:在不同风速下测力和测压结果的规律相似;雷诺数效应对全封闭声屏障的横风气动特性和顶部的风压分布影响较大;风攻角对全封闭声屏障的阻力系数有较大影响;不同断面的风压分布曲线具有相似的规律,本文给出了设计用的近似风压曲线。
In order to investigate the aerodynamic characteristics of closed noise barriers on high speed railway bridges under crosswinds,the three-component force and surface wind pressure of closed noise barriers were tested by wind tunnel tests with section models,and the inf luences of wind speed,Reynolds number effect,wind attack angle and section position on the aerodynamic characteristics of closed noise barriers were analyzed.The results show that the aerodynamic force and pressure distribution have a similar law at different wind speeds.Reynolds number effect has a great inf luence on crosswind aerodynamic characteristics and wind pressure distribution at the top of closed noise barriers.The wind attack angle has an obvious effect on the drag coeff icients of closed noise barriers.The wind pressure distribution curves of different sections have similar laws,and the approximate wind pressure curves for design were given.
In order to investigate the aerodynamic characteristics of closed noise barriers on high speed railway bridges under crosswinds,the three-component force and surface wind pressure of closed noise barriers were tested by wind tunnel tests with section models,and the inf luences of wind speed,Reynolds number effect,wind attack angle and section position on the aerodynamic characteristics of closed noise barriers were analyzed.The results show that the aerodynamic force and pressure distribution have a similar law at different wind speeds.Reynolds number effect has a great inf luence on crosswind aerodynamic characteristics and wind pressure distribution at the top of closed noise barriers.The wind attack angle has an obvious effect on the drag coeff icients of closed noise barriers.The wind pressure distribution curves of different sections have similar laws,and the approximate wind pressure curves for design were given.
引文
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[2]辜小安,李耀增,刘兰华,等.我国高速铁路声屏障应用及效果[J].铁道运输与经济,2012,34(9):54-58.
[3]韦勇.新型高速铁路声屏障的应用[J].中国铁路,2010(10):71-72.
[4]国家铁路局.高速铁路设计规范:TB 10621—2014[S].北京:中国铁道出版社,2014.
[5]栗健.城际铁路单侧高层建筑物声屏障形式设计研究[J].铁道标准设计,2014,58(7):153-157.
[6]邓跞,施洲,刘兆丰.高速铁路声屏障动力特性研究[J].铁道建筑,2009,49(11):101-104.
[7]HONDA A,ITO M,KIMURA H. Aerodynamic Instability of Prestressed Concrete Cable-stayed Bridge with Noise Barrier[J].Journal of Wind Engineering and Industrial Aerodynamics,1992,41-44:1169-1180.
[8]HOLMES J D.Wind Loading of Parallel Free-standing Walls on Bridges,Cliffs,Embankments and Ridges[J]. Journal of Wind Engineering and Industrial Aerodynamics,2001,89:1397-1407.
[9]郑史雄,王林明.铁路声屏障风荷载体型系数研究[J].中国铁道科学,2009,30(4):46-50.
[10]XIANG H Y,LI Y L,WANG B. Aerodynamic Interaction Between Static Vehicles and Wind Barriers on Railway Bridges Exposed to Crosswinds[J]. Wind and Structures,2015,20(2):237-247.
[11]向活跃.高速铁路风屏障防风效果及其自身风荷载研究[D].成都:西南交通大学,2013.
[12]拉有玉,李永乐,何向东.兰新铁路第二双线防风技术及工程设计[J].石家庄铁道大学学报(自然科学版),2010,23(4):104-108.
[13]王争鸣.兰新高铁穿越大风区线路选线及防风措施设计[J].铁道工程学报,2015,32(1):1-6,60.
[14]郭春,王明年.兰新第二双线铁路防风明洞实验段风荷载数值模拟研究[J].防灾减灾工程学报,2014,34(1):7-12.
[15]向活跃,李永乐,胡喆,等.铁路风屏障对轨道上方风压分布影响的风洞试验研究[J].实验流体力学,2012,12(6):19-23.
[16]中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局.建筑结构荷载规范:GB 50009—2012[S].北京:中国建筑工业出版社,2012.
[17]熊俊涛,乔志德.基于响应面法的跨声速翼型气动优化设计[J].实验流体力学,2005,5(1):104-108.