Experimental Study of Wind Pressure Correlation and Spectrum Characteristics on the Surface of Rectangular Roof Structure

Abstract

In order to study the wind pressure distribution characteristics of rectangular roof structure, the canopy gas station as the prototype manufacture of 1:20 scaled model, pressure test was carried out under the typical suburb wind field in wind tunnel.Rectangular roof was divided into different bands according to the flow characteristics. Firstly, qualitative analyse the distribution of the mean wind pressure on structure's surface.Secondly,choose different measuring points in bands,analyse power spectral density function in frequency domain and correlation coefficient in time domain of the wind pressure.The results show that the upper surface pressure distribution is mainly affected by the columnar vortex separation and lower surface wind pressure distribution is related to the interference of column,the surface net pressure distribution was affected by both columnar vortex separation and support column.Correlation of wind pressure is weakened in the windward front local region of the structure and the wake region of the support column. The wind pressure power spectrum of the structure surface is mainly related to the relative position of the flow,the support column increases the wind energy in the front and rear regions,which is harmful to the structure.

CFD Investigation of Aerodynamic Effects on Multi-span Low-rise Structures with Curved Canopy Roofs of Different Apex Height

“…[17] analysed factors such as angle of wind incidence and width of the passage affected the wind behaviour of cross-shaped high-rise buildings and to identify strategies for mitigating wind loads at reentrant corners. Works such as [18], [19] and [20] have also tried to investigate the impacts of different roof shapes such as pitched roofs, pyramidal roofs, flat roofs, circular roofs and rectangular roofs on wind load and structural behaviour of low-rise buildings.…”