第33卷第6期 2016年11月
土木工程与管理学报 Journal of Civil Engineering and Management
Vol. 33 No. 6 Nov.2016
罩棚结构对低矮建筑局部风载影响规律试验
戴益民，高阳，许灵波，蒋荣正，彭
（湖南科技大学土木工程学院，湖南湘潭411201）
摘要：采用缩尺比为1：20风洞试验刚性模型，以风向角及屋面坡角为变量，针对单体低矮建筑及罩棚与低矮建筑组合而成的罩棚式低矮建筑屋面局部风载展开风洞试验研究，采用风压系数差深入探讨B类地貌下罩棚结构对配套低矮建筑屋面迎风屋沿、屋脊及屋面角部等局部测点风压影响变化规律。结果表明：不同风向下罩棚对低矮建筑迎风屋沿处风压的影响随着屋面坡角的增大而减小，对背风屋面各分区的影响较小。随着风向角的改变，迎风屋面靠山墙边缘及角部区域受罩棚影响呈增大趋势。45°斜风向下，平屋面（β=0°）迎风屋沿测点6风压系数变化最大，风压系数差为-2.01。当来流平行于屋沿方向时，罩棚结构对迎风屋沿、屋脊、屋面角部等易损区的风压系数随坡角的变化影响最小，
关键词：低矮建筑；罩棚；局部风载；风洞试验；风压系数
中图分类号：TU312+.1
文献标识码：A
文章编号：2095-0985(2016)06-0001-05
Experimental on Local Wind Load of Low-rise Building Affected by Canopy
DAIYi-min，GAOYang，XU Ling-bo,JIANG Rong-zheng，PENGWang
(School of Civil Engineering,Hunan University of Science and Technology, Xiangtan 411201, China) Abstract : Adopting the rigid model of wind tunnel test at a scale of 1 :20, the roof local wind load of isolate low-rise building and composite structure of canopy and low rise building were studied at different wind azimuths and roof pitchs. The wind pressure change law of the measuring points which were affected by canopy on the windward eaves , ridge and roof corner of the low-rise building under B landscape were further discussed by using wind pressure coefficients differences in the wind tunnel. The results indicate that the influence of canopy on windward eaves of low-rise building decreases with the increase of the slope pitch, and there has a little influence on the leeward eaves at different wind azimuths. The influence of canopy on the edge of windward gable wall and corner increases with the wind direction changed. The wind pressure coefficient of tap 6 on windward eaves of flat roof (β = 0°) varies widely at wind azimuth of 45°, and the wind pressure coefficients differences is -2.01. When the wind azimuth is 9o°, the canopy has a little influence on the vulnerable zone of low-rise building with the slope pitch changed.
Key words: low-rise building; canopy; local wind load; wind tunnel test; wind pressure coefficient
加油站一般由大跨罩棚结构与配套用低矮建筑组合而成，而历次风灾调查研究表明，低矮房屋的损毁主要表现为迎风屋面转角、边缘和屋脊等易损部位（简称易损区）先损毁并进而引发建筑的整体倒塌。国内外针对罩棚结构对配套低
收稿日期：2016-03-04修回日期：2016-05-12
矮建筑影响的研究不多，所以开展罩棚结构对配套低矮建筑屋面易损区风载特性研究具有重要的现实意义。刘帅等风洞试验研究了矩形及圆形罩棚屋面结构表面风压特性，提出了两类罩棚结构风载体型系数，并分析了模型尺寸变化对风
作者简介：戴益民（1972-），男，湖南娄底人，教投，博土，研究方向为建筑结构抗风（Emaildymzzy@163.com）
通讯作者：高阳（1990-），男，山东济宁人，硕士研究生，研究方向为建筑结构抗风（Email：gaoyang3566@163.com）基金项勇-丹鞍据然科学基金（51578237）：湖南科技大学研究生创新基金（S140008）