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为探究典型檐口形状对屋面风压分布规律的影响,基于日本东京工艺大学风洞试验数据,针对四坡低矮房屋采用ANSYS CFD计算流体力学软件的两种湍流模型展开研究,验证了RNGk-ε湍流模型对四坡低矮房屋表面风压研究的可靠性。利用此模型深入研究檐口不同外伸长度与出挑高度对四坡低矮房屋风压影响规律。结果表明:檐口的外伸长度及出挑高度对屋面风压影响明显,当外伸长度不变时,随出挑高度的增大,迎风面风吸力随之增大;当出挑高度不变(出挑高度分别为0.5,1.0m)时,随着外伸长度的增大,迎风面负风压减小;外伸长度为1.5m、出挑高度为1.0m为最有利于房屋表面抗风设计;随外伸长度增大,檐口各区域风压减小,但设置檐口形状2比檐口形状1较有利于房屋表面抗风设计,结论可为台风多发地区低矮民居设计提供建议。
In order to explore the effect of typical cornice shape on roof wind pressure distribution, based on the wind tunnel test data of Tokyo University of Technology in Japan, two turbulence models using ANSYS CFD computational fluid dynamics software were studied for low profile houses. The results show that RNGk-ε Reliability of Turbulence Model on Surface Wind Pressure Research on Four Slope Low Buildings. This model is used to study the influence of different overhanging length and overhanging height of cornices on the wind pressure of low slope house. The results show that the eave extension and ejection height have obvious influence on the roof wind pressure. When the extension length is constant, the windward suction force increases with the increase of the exit height. Respectively 0.5, 1.0m), the negative wind pressure on the windward side decreases with the increase of the extensional length. The extensional length of 1.5m and the height of 1.0m are the most conducive to wind-resistant design of the house surface. However, the shape of cornice 2 is more favorable for the design of wind-resistant design than the cornice shape. The conclusion can provide suggestions for the design of low-rise dwelling houses in typhoon-prone areas.