Numerical Simulation And Analysis Of Wind Loads Characteristics On Surface Of Low-rise Hip Roof Building

In recent years, the wind damage of low-rise building which caused by the extreme wind climate was gradually increasing. Hurricane statistics shows that low-rise building wind disaster is mainly due to the roof of local storm damage caused overall damage. In our country, garden, pavilion, etc are low-rise hip-roof buildings, so research load characteristics of low-rise hipped roof buildings have practical significance.Based on Ansys Fluent software and the data of wind tunnel test, the wind pressure on a model building at a geometric size of 24m×16m×4m( L×B×H) and roof slope angle of 45 ° was computed with fluent standardk??、Realizablek??、RNGk??and SSTk??model. The distribution and change law of roof mean pressure of the building were summarized. The reliability of four turbulent models was proved, and the most appropriate turbulence model for following study can be selected by comparing the results.For hip-roofed low-rise building, regard the main building parameters such as roof pitch, wind angle as variables, analyses the effects of these parameters on the wind load characteristics of windward roof local areas, the measuring point peak pressures under different conditions are obtained. The results show that: the influence of wind angle on the wind pressure distribution is obvious, presenting regular changes; when slope angle α = 5 ° ~ 10 °, wind angle β = 0 °, A district suffers the maximum negative pressure, when α = 15 ° ~ 30 °, β = 45 °, C zone suffers relatively large pressure, and when α = 30 ° and 45 °, β = 0 °, A zone suffers the maximum positive pressure, when β = 10 ° and 20 °, the pressure of the roof corner areas reaches the maximum. In different slope conditions, the wind pressure of corner areas of D zone increases as the angle increases.A study is performed for wind load characteristics of hip-roofed low-rise b uilding with eaves, eaves structure parameters and shape as variables. The res ults show that the configuration cornice overhang length of 1.5m, 2.0m, the v ertical height of 1.0m, 1.5m, can play the absolute value of the average press ure lowering effect of the roof, and L = 1.5m, h = 1.0m is the most favorab le wind-resistant design; The increases of eaves overhanging length can reduce the absolute value of average roof wind pressure coefficient, it has the effectof reducing roof wind pressure, and set rone is more advantageous to wind re-sistance design.Finally, the different form of roof is simulated, by the contrastive analysis of the factors such as wind direction, slope angle, reveals the wind resistance characteristics of low-rise building with gable, flat, hip or conical roofs,it is revels that conical roof is more advantageous to wind resistance design. It is expected that the study result should be valuable for wind-resistance design of low-rise buildings.