单坡光伏车棚风洞试验研究
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摘要
对屋面倾角10°、20°和30°的单坡光伏车棚进行缩尺刚性模型测压风洞试验,研究倾角和有无停车对屋面整体体型系数、平均风压系数、极值风压系数和局部块体型系数的影响规律,与当前国家规范取值进行比较。结果表明,单坡光伏车棚上半区屋面主要承受风吸力作用,下半区屋面主要承受风压作用,最不利整体风荷载试验值比规范取值小20%左右;屋面整体平均风荷载和屋面各分块承受的风荷载随屋面倾角的增大而增加,上屋檐角部分块为最不利风吸力发生位置,下屋檐角部分块为最不利风压发生位置;停车会增大上半区屋面风吸力约10%,减小下半区屋面的最不利风压作用约70%。
Wind tunnel tests for a solar parking shed with a mono-sloped roof with inclination angle of 10°, 20° and 30° were conducted with a reduced scale rigid model. The effect laws of inclination angle, parking cars and not parking cars on roof overall shape coefficient, mean wind pressure coefficient, peak wind pressure coefficient and roof's local block shape coefficient were studied, and these parameters were compared with those in current national codes. The results showed that the upper half roof suffers wind suction action, and the lower half roof suffers wind pressure action; the test values of the most unfavorable overall wing loads are 20% less than those in current national codes; the roof overall mean wind load and each block's wind load increase with increase in inclination angle, the most unfavorable wind suction occurs at upper eave corner block, and the most unfavorable wind pressure occurs at lower eave corner block; parking cars can increase wind suction on upper half roof by 10%, and decrease wind pressure on lower half roof by 70%.
Wind tunnel tests for a solar parking shed with a mono-sloped roof with inclination angle of 10°, 20° and 30° were conducted with a reduced scale rigid model. The effect laws of inclination angle, parking cars and not parking cars on roof overall shape coefficient, mean wind pressure coefficient, peak wind pressure coefficient and roof's local block shape coefficient were studied, and these parameters were compared with those in current national codes. The results showed that the upper half roof suffers wind suction action, and the lower half roof suffers wind pressure action; the test values of the most unfavorable overall wing loads are 20% less than those in current national codes; the roof overall mean wind load and each block's wind load increase with increase in inclination angle, the most unfavorable wind suction occurs at upper eave corner block, and the most unfavorable wind pressure occurs at lower eave corner block; parking cars can increase wind suction on upper half roof by 10%, and decrease wind pressure on lower half roof by 70%.
引文
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[2] CAO J,YOSHIDA A,SAHA P K,et al.Wind loading characteristics of solar arrays mounted on flat roofs[J].Journal of Wind Engineering & Industrial Aerodynamics,2013,123(4):214-225.
[3] 李寿科,李寿英,陈政清.太阳电池板风荷载试验研究[J].太阳能学报,2015,36(8):1884-1889.LI Shouke,LI Shouying,CHEN Zhengqing.Experimental investigation of wind loading of solar panels[J].Acta Energiae Solaris Sinica,2015,36(8):1884-1889.
[4] KOPP G A,FARQUHAR S,MORRISON M J.Aerodynamic mechanisms for wind loads on tilted,roof-mounted,solar arrays[J].Journal of Wind Engineering & Industrial Aerodynamics,2012,111(12):40-52.
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[7] 中华人民共和国建设部.建筑结构荷载规范50009—2012[M].北京:建筑结构出版社,2012:36-50.
[8] GUMLEY S J.A parametric study of extreme pressures for the static design of canopy structures[J].Journal of Wind Engineering & Industrial Aerodynamics,1984,16(16):43-56.
[9] UEMATSU Y,STATHOPOULOS T,IIZUMI E.Wind loads on free-standing canopy roofs:Part 1 local wind pressures[J].Journal of Wind Engineering & Industrial Aerodynamics,2008,96(6/7):1015-1028.
[10] UEMATSU Y,STATHOPOULOS T,IIZUMI E.Wind loads on free-standing canopy roofs:Part 2 overall wind forces[J].Journal of Wind Engineering & Industrial Aerodynamics,2008,96(6):1029-1042.
[11] 杨金焕.固定式光伏方阵最佳倾角的分析[J].太阳能学报,1993(4):344-347.YANG Jinhuan.Analysis of optimum tilted angle for fixed photovoltaic arrays[J].Acta Energiae Solaris Sinica,1993(4):344-347.