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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. Introduction The shed-type gas station is a structural form with a large span in low-rise buildings. Under the strong winds of high turbulence, the surface of the structure is subjected to repeated wind loads to generate wind-induced vibration, which easily leads to fatigue damage of the structure and its accessory components. For this special structural form, the relevant wind load values have not been directly given in China's load code, so it is necessary to carry out relevant research. For the study of the wind load characteristics of the low-rise buildings with sheds, Shuai L[1]conducted a series of wind tunnel tests on circular and rectangular shed-type low-rise buildings, and gave detailed analysis of wind pressure coefficient, zonal shape coefficient and gust coefficient. Yuxue L[2] conducted a wind tunnel test on a dry coal shed, and analyzed the correlation of surface wind pressure in the time domain and the frequency domain. Natalini M B et al.[3]conducted a wind tunnel test on arched shed roof structures with different body ratios, and gave the recommended values for wind loads. Augusto Poitevin et al. [4] adopted wind tunnel test and numerical simulation to study the influence of the height of the parapet wall and the length of the cantilever on the wind pressure on the surface of the open shed structure. In this paper, a wind tunnel test is carried out for the rigid model of the gas station cover shed with a scale ratio of 1:20. The wind pressure coefficient distribution, the net wind pressure coefficient distribution and the net pulsating wind pressure spatial correlation of the upper and lower surfaces under different wind direction angles are studied. The characteristics of the net pulsating wind pressure spectrum explain the mechanism of the surrounding flow field around the structure, and provide theoretical support for further research on the wind-induced failure mechanism of the shed structure.

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