Numerical Simulation Of Surface Wind Load And Wind Resistant Design For Low-rise Buildings In Southeast Coastal Areas

Typhoon’s visit often cause severe damage or destroy to a mass of buildings especially the widely existing low-rise buildings. 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. With the development of computational hardware technology and the theory of computational fluid dynamic, the numerical stimulation technique is playing an significant role in wind engineering by its unique superiority. Meanwhile, it provides an efficient way for the study of wind loads on low-rise buildings. In this paper, the CFD software FLUENT is applied to analyze the wind-induced pressure distribution on the roof of low-rise buildings and at the same time, it is discussed that the impact of the wind pressure on the roofs under different building geometry parameters. The main research works and results are presented as follow:1、The numerical stimulation of the Silsoe 6 meter model and low-rise gable roofed building with eaves. The flow fields under two typical wind directions,90° and 45°, are simulated. The obtained numerical results were compared with those of the field measurement and wind tunnel test,then the validity and accuracy of the numerical simulation were demonstrated.2、Numerical simulation techniques were conducted on 60 gabled roof low-rise buildings with 10 pitches,3 height-depth ratios and 3 width-depth ratios. According to the test results and the foreign load codes, the surface of the buildings was divided and the region shape coefficients which were used to calculate wind loads of main-wind-force resisting system were given. The effects of pitches, height-depth ratios and width-depth ratios on region shape coefficients were analyzed, and the region shape coefficients were fitted with pitches, height-depth ratios and width-depth ratios by least square method. The computed values using the fitted formulas were compared with load codes of different countries. The reliability of the fitted formulas was verified and many values in Chinese load code tend to be low.3、Then the region shape coefficients values, wind-resistance design method and simplification formula which were used to calculate wind loads of main wind-force resisting system in Chinese load code for the design of building structures were suggested in accordance with the test values and ASCE7-10 load codes. Finally,anti-typhoon construction configuations and reinforcement methods were concluded.