Numerical Simulation Of Wind Loads On High-Rise Building

High-rise building structure is more sensitive to the wind action, thus, there is some extremely practical significance on the design of wind-resistant as determining of the wind loads distribution on the structure.Firstly, through wind tunnel test, this thesis studied the wind pressure distribution and the top acceleration of tower A in Chengdu Oriental hope Intertek. The analysis showed that the comfort degree of the building met the requirements. Then computational fluid dynamics software FLUENT was used to simulate the wind pressure distribution on the building under design wind speed in100year return period and terrain roughness category. A comparative analysis of calculation and wind tunnel test was conducted to verify the reliability and validity of the numerical simulation method, also to explain the respective advantages and disadvantages of the two methods.Secondly, the same method was used to simulate the closed building models under two conditions:the same width-thickness ratio and different Aspect Ratio as well as the same Aspect Ratio and different width-thickness ratio. Some useful conclusions were got through analysing the relationship between the wind load shape coefficients and the size of buildings, which providing reference for the selection of the wind load shape coefficients when conducting wind resistant design. Through contrasting Shape Coefficient of each surface of the buildings and Code, it showed that the latter failed to consider the impact of different aspect ratio or width-thickness ratio, and existed some certain irrationality。Finally, the FLUENT software was used to draw two-dimensional unsteady simulation on the main structure of section of hope Intertek Tower A and the different width-thickness ratio of building’s cross section above-mentioned, meanwhile to draw a long enough monitoring on the building surface lift as well as the cross-wind direction speed in wake area at different monitoring points. The dominant frequency of vortex shedding and the Strouhal number of each section were obtained by analyzing the obvious dominant frequency point choosing from the result of FFT transform on time history of the wind speed and lift in wake area. The paper is to provide some reference and suggestions for determining the critical wind speed.