Study On Characteristics Of High-Rise Buildings Wind Load With Numerical Simulation Of Wind Tunnel

With rapid development of Chinese construction industry, more and more high-rise buildings were constructed in the country, and windload is one of the most important factors for high-rise buildingconstruction considerations.Due to randomness of the wind, and with altitude increasing in troposphere, the flow of stratospheric wind field become more complex, so it's often need to make a scale model wind tunnel tests forhigh-rise buildings designing to analyse the wind building in special circumstances. However, costs of wind tunnel testsare highas well asgetting experiments data is difficult, the test methods which using computer simulations of the wind tunnel have been developed, in orderto reduce the thresholds of testing and increase the reliability of engineering.This paper use popular computational fluid dynamics software Fluent to simulate numerical wind tunnel of high-rise buildings, the simulation results based on different methods of discrete will be compared. By analyzing the simulation results at different heights wind pressure and speed distribution of several methods to study the disadvantages and scope of applications. Then the simulation results will be compared with wind load results calculated by Chinese load codes, the main indicators of this analysis, including wind pressure height variables, wind load shape coefficients, base shears and overturning moments.The research get following conclusions: there are differences between the numerical simulation results and results from load code of wind load height variable upon 2/3h. Although with the height greater the wind speed greater, but at the top of the building air channel is relatively wider, so there will be some decreasing of the wind pressure. This featurecan be considered in the optimizing of engineering designing. At low altitudes, windward side pressure of the standard ?- ? model used second order discrete is larger than the results based on the first order discrete format, but there is a contrary results for the leeward side absolutely pressure. Base on the wind velocity vector can get the information that the error of pressure on the side of second order is large, and accuracy of the windward and leeward based on the first order discrete format is lower than second order discrete format. Base shear and overturning moment of numerical simulation results is less than which according to the load code, but the error is less than 5%, meeting project requirements.