风特性参数对低矮房屋屋面局部风压影响的数值分析

Numerical study of effects of wind characteristic parameters on local wind pressures on low-rise buildings

为获取低矮房屋屋面局部风压的分布规律,对体型比为1.5∶1∶1的双坡低矮房屋屋面划分若干典型区域并进行数值模拟研究.数值结果与风洞试验结果对比表明:2种研究手段分析结果吻合较好,验证了数值模拟技术在分析低矮房屋表面风压方面的可靠性.基于数值模拟,研究了不同风特性参数对低矮房屋屋面局部区域体型系数分布规律的影响,分析结果表明:来流风向对屋面各区域体型系数的影响是整体性的,且表现出一定规律性;湍流度对屋面各局部区域体型系数的影响不一,对迎风屋面前缘区域影响较大;风速对屋面局部区域体型系数影响较小.本文结论可为我国沿海多发台风地区低矮房屋抗台风设计提供依据.

In order to obtain the distribution of local wind pressures on roof of a low -rise building,the numerical simulation of a gable roof low-rise building with a 1.5∶1∶1 body type was performed based on the roof dividing several typical zones,compared with wind tunnel tests,the results obtained from the simulation match well, the reliability of the numerical simulation in analysis wind pressures of a low ! rise building was verified.Based on numerical simulation,the distributions of local wind pressure on roof for different wind characteristics parameters were studied.Analysis results show that the wind direction has a whole effect on local wind pressure and show some regularity,Turbulence intensity has a different effect on local wind pressure,and has a great influence on areas of the windward roof;wind speed has a little effect on the local wind pressure.The research provides a foundation for the designing of low-rise building anti-typhoon in China＆#39;s coastal typhoon-prone regions.