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对体型比为1.5∶1∶1的双坡屋面低矮房屋表面风压进行了数值模拟,模拟结果与同体型比的低矮建筑风洞试验结果对比的表明:所提数值模拟方法能较好地反映低矮建筑表面风压的分布,由其得到的表面风压与风洞试验结果吻合较好。以风向角为变量,深入研究了墙面开洞面积及位置对低矮房屋屋面局部风压的影响规律。结果表明,房屋墙面开洞对屋面外风压影响较小;不同墙面开洞工况对屋面风压的影响与来流风向密切相关,迎风墙面存在单一洞口时,内压与外压联合作用会显著放大其屋面风荷载。我国荷载规范在规定存在洞口的低矮房屋抗风设计时,尚需考虑风致内压的影响。
The wind pressure on the surface of a low profile double-slope roof with low body building ratio of 1.5: 1:1 is numerically simulated. The comparison between the simulation results and the low-building wind tunnel test results shows that the proposed numerical simulation method is better Reflects the distribution of wind pressure on the low-rise building surface, and the surface wind pressure obtained by the wind tunnel test is in good agreement with the wind tunnel test results. Taking the wind direction angle as a variable, the influences of the area and location of the wall opening on the local wind pressure on the low-rise building roof are studied in depth. The results show that the opening of the house wall has little effect on the wind pressure outside the house. The influence of different wall opening conditions on the wind pressure is closely related to the flow of the incoming wind. When there is a single opening on the windward wall, the internal pressure and external pressure The combined effect significantly increases the wind load on the roof. China’s load norms in the provisions of the existence of low-cost housing wind-resistant design, still need to consider the impact of wind-induced internal pressure.