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（湖南科技大學(xué)土木工程學(xué)院， 湘潭 411201）

［摘要］采用縮尺比為1∶20風(fēng)洞試驗(yàn)剛性模型，以風(fēng)向角和屋面坡角為變量，針對(duì)單體低矮建筑及罩棚與低矮建筑組合而成的罩棚式低矮建筑的屋面局部極值風(fēng)壓展開風(fēng)洞試驗(yàn)研究，深入探討罩棚結(jié)構(gòu)對(duì)與之配套的低矮建筑屋面迎風(fēng)屋檐、屋脊及角部局部測點(diǎn)極值風(fēng)壓系數(shù)差的影響。結(jié)果表明：在垂直屋脊來流風(fēng)向（風(fēng)向角0°）下罩棚對(duì)低矮建筑迎風(fēng)屋檐處測點(diǎn)極小值風(fēng)壓系數(shù)差的影響隨著屋面坡角的增大而減??；隨著風(fēng)向角的改變，迎風(fēng)屋面靠山墻邊緣及角部區(qū)域測點(diǎn)極大值、極小值風(fēng)壓系數(shù)差受罩棚的影響增大，且45°風(fēng)向角下達(dá)到最大；當(dāng)來流風(fēng)向平行于屋檐方向（風(fēng)向角90°）時(shí)，隨著屋面坡角的變化，罩棚結(jié)構(gòu)對(duì)低矮房屋迎風(fēng)屋檐、屋脊、角部等局部易損區(qū)測點(diǎn)極大值、極小值風(fēng)壓系數(shù)差的影響最小。屋面坡角為45°時(shí)，隨著風(fēng)向角的改變，屋面局部測點(diǎn)極小值風(fēng)壓系數(shù)差受罩棚的影響較其他屋面坡角的小。

［關(guān)鍵詞］低矮建筑； 罩棚； 極值風(fēng)壓； 坡角； 風(fēng)洞試驗(yàn)

中圖分類號(hào)：TU312+.1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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

* 國家自然科學(xué)基金面上項(xiàng)目(51578237),湖南科技大學(xué)研究生創(chuàng)新基金(S140008)。

作者簡介：戴益民，博士，教授，Email：dymzzy@163.com。