884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

(1 湖南科技大學(xué)土木工程學(xué)院，湘潭 411201； 2 湖南大學(xué)土木工程學(xué)院，長沙  410082)

［摘要］基于尺寸比為1.5∶1∶1(長∶寬∶高)的低矮房屋的風(fēng)洞試驗數(shù)據(jù)，分析了9類不同坡角的低矮房屋在5個不同風(fēng)向的風(fēng)場環(huán)境下，迎風(fēng)屋面屋檐、屋脊等局部區(qū)域測點的平均、脈動及峰值風(fēng)壓系數(shù)。通過對比低矮房屋在不同坡角、不同風(fēng)向作用下屋面的風(fēng)壓變化規(guī)律，總結(jié)了坡角及風(fēng)向?qū)Φ桶课菸菝婢植匡L(fēng)壓的影響規(guī)律。結(jié)果表明，低矮房屋在45°風(fēng)向(坡角為0°)時，迎風(fēng)屋面屋檐測點的風(fēng)壓最大，而背風(fēng)屋面靠近屋脊的局部區(qū)域的風(fēng)壓隨坡角的增大而增加。為今后改進低矮房屋的設(shè)計提供了依據(jù)。

［關(guān)鍵詞］低矮房屋；局部風(fēng)壓；風(fēng)壓系數(shù)；風(fēng)洞試驗

中圖分類號：TU375.4文獻標識碼：A文章編號：1002-848X(2011)06-0103-07

Wind pressures around the windward roof edges on low-rise buildings

Dai Yimin^{1, 2}, Li Qiusheng²(1 College of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;2 College of Civil Engineering, Hunan University, Changsha 410082, China)

Abstract:Based on the wind tunnel test of 9 kinds of low-rise buildings with different roof pitch model at a geometric scale of 1.5∶1∶1(L∶B∶H),  the characteristics of mean, fluctuating and peak pressures coefficients of the eaves and the ridge of  the windward roof  at  5 wind azimuths were investigated, and the area-averaged pressure coefficients were summarized. Through comparison with the available wind tunnel test data, it is found that the high wind pressure zones occurred around the windward roof edges at a wind azimuth of 45°, and wind pressure along the roof corner just behind the roof ridge at the windward end of the roof raised with the increase of the slope pitch. It is expected that the results should be references for wind-resistance design of low-rise buildings.

Keywords:low-rise building; local wind pressure; wind pressure coefficient; wind tunnel test

*湖南省優(yōu)秀青年骨干教師資金資助（湘教通（2009）391號）。

作者簡介：戴益民，博士，副教授，Email:dymzzy@163.com。

參考文獻

［1］  SPARKS P R, SCHI S D, REINHOLD T A. Wind damage to envelopes of houses and consequent insurance losses ［J］. Journal of Wind Engineering and Industrial Aerodynamics,1994，53(9):145-155.

［2］  MINOR J E, MEHTAOOK K C. Wind damage observations and imlications ［J］. Journal of Structural Division，ASCE, 1979,41(11)：2279-2291.

［3］  MEHTA K C. Wind induced damage observations and their implications for design practice ［J］. Journal of Structural Engineering，ASCE，1990,33(6)：242-247.

［4］  UEMATSU Y, MIYOSHI T. Wind damage to cladding of residential houses due to typhoon in the Tohoku District, Japan, Tohoku［J］. Journal of Natural Disaster Sci.，1998, 42(7)：32-34.

［5］  UEMATSU Y, ISYUMOV N. Wind pressures acting on low rise buildings［J］. Journal of Wind Engineering and Industrial Aerodynamics，1999, 82(5)：1-25.

［6］  MEHTA K C, LEVITAN M L. Roof corner pressures measured in the field on a low building［J］. Journal of Wind Engineering and Industrial Aerodynamics，1992，41-44(10)：181-192.

［7］  戴益民,李秋勝,李正農(nóng). 低矮房屋屋面風(fēng)壓的實測研究［J］. 土木工程學(xué)報, 2008, 41(6):9-15.

［8］  戴益民,李正農(nóng),李秋勝. 低矮房屋的風(fēng)載特性——近地風(fēng)剖面變化規(guī)律的研究 ［J］. 土木工程學(xué)報, 2009, 3(42):44-51.

［9］  李秋勝,戴益民,李正農(nóng). 強臺風(fēng)“黑格比”登陸過程的近地風(fēng)場特性［J］. 建筑結(jié)構(gòu)學(xué)報,2010,31(4):55-62.

［10］  李秋勝,戴益民,李正農(nóng). 強臺風(fēng)“黑格比”作用下低矮房屋的風(fēng)壓特性［J］. 建筑結(jié)構(gòu)學(xué)報,2010,31(4): 62-69.

［11］  戴益民,李秋勝,李正農(nóng). 低矮房屋屋面風(fēng)壓的實測及分析［J］.建筑結(jié)構(gòu)，2009,39(7):88-91.