挑檐和出山对低矮房屋屋面平均风压的影响

Effect of eave and protruding gable wall on average wind pressure on low rise building roof

基于Fluent 6.3软件对4种屋面形式进行了数值模拟,采取对有挑檐、有出山屋面形式的数值模拟结果与风洞试验进行对比的方式,验证了本文数值模拟方法的可行性。在此基础上模拟了多种屋面形式,得到:挑檐影响屋面平均风压系数分布的作用显著,不同风向角时影响风压作用大小不同,挑檐能够使屋面体型系数减小,但随着长度的增加减小趋势会下降;出山能够改变屋面平均风压分布,对于抗风总体是有利的,当高度较大时不能忽略其不利影响。

Based on the software Fluent 6.3, four roof forms were conducted by numerical simulation. By taking on comparison of numerical simulation and wind tunnel test results, the feasibility was verified. Various roof forms were conducted. Get conclusions：the effect of cave on mean wind pressure coefficient distribution was obvious. The effect of wind pressure on the roof had difference at different wind angles. The cave could decrease the roof shape coefficient but with the overhang length increasing the decreasing trend would decline. The protruding gable wall could change distribution of mean wind pressure and it was generally favorable for roof wind resistance. The effect of protruding gable wall could not ignore when it was very high.