Numerical Simulation Of Wind Characteristic And Interferennce Effects On Low-rise Hip Roofed Buildings

The coastal regions of China are those areas that typhoon frequently visits. Typhoon's visit often cause severe damage or destroy to a mass of buildings especially the widely existing low-rise slope roofed single buildings or building complexes. Therefore it is highly necessary to make clear the distribution law of wind pressures on such kind of buildings and accordingly find the corresponding wind-resisting means.In this paper, the numerical simulation techniques are employed to study the wind-induced pressure distribution on the roof of low-rise hip roofed buildings as well as the airflow interference among a building complex composed of such kind of buildings. On the Basis of the existing research achievement, the fundamental equations and numerical discretization and solution approaches for turbulent wind flow based on the averaged Navier-Stokes equation and k-e turbulence model were established. As the first numerical example a low-rise hip roofed building model was considered. The obtained numerical results were compared with those of the wind tunnel test and the validity and accuracy of the numerical simulation were demonstrated. Through analysis of wind pressures for different pitches under different wind directions, the shape factors on the roof of the building were evaluated. Then practical formulae for determination of shape factors on the roof of such buildings were established. These practical formulae can be directly applicable to the wind resistance design of single hip roofed buildings.Secondly, the numerical simulation was performed to determine the wind pressure distributions and turbulence characteristics of two hip roofed buildings having the same geometrical shape but with different plan layout and distance in different wind directions. The interference factor curves and other wind characteristics (including the averaged wind pressure, velocity and the turbulence energy) at the central vertical section and the horizontal section at 2/3 total height were obtained and compared with those of single buildings.Finally, the wind flow around and wind-induced pressures on a building complex, which consists of six low-rise hip roofed houses were numerically predicted. The distribution trends of wind pressures on the surface of the building complex caused by the effect of multi-building interaction were analyzed. The results obtained in this paper can be applicable to wind-resisting design of hip roofed buildings.