Investigation Of Wind Effects On A Low-rise Building By Field Measurements And Wind Tunnel Tests

In this thesis, the wind loads on a low-rise building during typhoons were investigated through field measurements and wind tunnel tests. This study focuses on understanding near ground typhoon-generated wind characteristics and wind effects on a low-rise building under extreme wind conditions. The major content of this study are as follows:Firstly, The results of wind characteristics and pressure coefficients on the flat roof instrumented low-rise building were studied based on the field measurements of wind data and associated building surface pressures during Typhoon "Haima". The surface level wind turbulence characteristics such as gust factor, turbulence intensity, turbulence integral length scale and spectra were investigated for coastal terrain roughness regime. Moreover, detailed analysis of the mean, standard deviation and negative peak pressures measured on the building surfaces were conducted to investigate the pressure distribution characteristics during typhoon landfalling. The comprehensive analysis of the field measurement results provided useful validation for wind tunnel test results of the wind effect on the low-rise building.Secondly,1:10model scale test of the instrumented low-rise building was conducted to assess the wind loads on the experimental building for coastal terrain. The mean, negative peak and rms pressure coefficient distributions on the the building were presented and discussed. Large peak suction pressure coefficients were observed near the leading edge area of the roof for oblique wind directions. The model test results were compared to the field measurements to evaluate the accuracy of the wind tunnel simulations. Moreover, for the purpose of designing of low-rise buildings in typoon-prone regions, the effects of building shape and different terrain conditions on the wind pressures on the low-rise building were investigated. TThe output of the comprehensive study was expected to provide useful information and reference for the wind resistant design of low-rise buildings in typhoon-prone regions.