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罩棚影响低矮建筑局部极值风压试验研究*
戴益民,高阳,许灵波,彭望,蒋荣正
摘 要

(湖南科技大学土木工程学院, 湘潭 411201)

[摘要]采用缩尺比为1∶20风洞试验刚性模型,以风向角和屋面坡角为变量,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的屋面局部极值风压展开风洞试验研究,深入探讨罩棚结构对与之配套的低矮建筑屋面迎风屋檐、屋脊及角部局部测点极值风压系数差的影响。结果表明:在垂直屋脊来流风向(风向角0°)下罩棚对低矮建筑迎风屋檐处测点极小值风压系数差的影响随着屋面坡角的增大而减小;随着风向角的改变,迎风屋面靠山墙边缘及角部区域测点极大值、极小值风压系数差受罩棚的影响增大,且45°风向角下达到最大;当来流风向平行于屋檐方向(风向角90°)时,随着屋面坡角的变化,罩棚结构对低矮房屋迎风屋檐、屋脊、角部等局部易损区测点极大值、极小值风压系数差的影响最小。屋面坡角为45°时,随着风向角的改变,屋面局部测点极小值风压系数差受罩棚的影响较其他屋面坡角的小。

[关键词]低矮建筑; 罩棚; 极值风压; 坡角; 风洞试验

中图分类号:TU312+.1文献标识码:A文章编号:1002-848X(2018)06-0104-05

 

Experimental study on local extreme wind pressure of low-rise building affected by canopy

Dai Yimin, Gao Yang, Xu Lingbo, Peng Wang, Jiang Rongzheng

(School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201,  China)

Abstract:The rigid model of wind tunnel test at a scale of 1∶20 was adopted with the wind azimuth and slope angle as variables to study roof local extreme pressure of single low-rise building and composite building composed of canopy and low-rise building. The impact of canopy structure on extreme wind pressure coefficient difference of the measuring points on the windward eaves, ridge and corner of the low-rise building roof was investigated in detail. The results indicate that the influence of canopy on windward eaves of low-rise building decreases with the increase of the slope angle at wind azimuth of 0°. The influence of canopy on  extreme maxmum and minimum wind pressure coefficient difference  of the measuring poinos on the edge of windward gable wall and corner increases with the wind direction change and reach maximum at wind azimuth of 45°. When the wind azimuth is 90°, the canopy has a little influence on  extreme maxmum and minimum wind pressure coefficient difference  of the measuring poinos on  the vulnerable zone of windward eaves, ridge and corner  of low-rise building with the slope angle change. And the canopy has a little influence on the extreme minimum wind pressure coefficient difference  of local taps when the slope angle is 45° with change of wind azimuth.

Keywords:low-rise building; canopy; extreme wind pressure; slope angle; wind tunnel test

 

* 国家自然科学基金面上项目(51578237),湖南科技大学研究生创新基金(S140008)。

 

作者简介:戴益民,博士,教授,Email:dymzzy@163.com。

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