(1.School of Civil Engineering,Central South University,Changsha 410075,China; 2.High-speed Railway ConstructionTechnology National Engineering Laboratory,Central South University,Changsha 410075,China) 在知网中查找 在百度中查找 在本站中查找
To study the influence of surface roughness on wind loads and wind-induced responses of super-tall building,a rigid model synchronous pressure measurement wind tunnel test of a square building was carried out by selecting two types of surface roughness—rough strip and sandpaper.After the analysis on the characteristics of the wind pressure distribution of the model,the aerodynamic force coefficients,the aerodynamic power spectra,and the wind-induced responses were subsequently analyzed.The results show that the spacing and thickness of the rough strip have a certain influence on the surface wind pressure of the high-rise building,but the influence is not obvious when the prominent coefficient is less than 0.4%;Sandpaper can obviously reduce the intermediate layers-average wind pressures on the windward side and the absolute values on the lateral side and lee side,and the fluctuating pressures,but would increase the absolute values of the mean wind pressures on the top of building (the influence rates are all less than 25%);The surface roughness has less effect on the along-wind aerodynamic power spectra,however,it would decrease the frequency a little (less than 5%),and meanwhile reduce the amplitude of the vortex shedding.The prominent objects on building surface in certain thickness range can reduce the surface wind loads and wind-induced responses.The roughened processing for building surface is generally conducive to structural wind resistance.
