Research On Wind Pressure Extreme Value On Claddings Of Long-span Roof Structure Of Multiple Corridors Considering Wind Direction

Wind load is one of the control loads in the wind resistance design of large-span roof enclosure structure,and currently China’s " Load code for the design of building structures " GB5009-2012 does not consider the influence of wind direction on the wind load of enclosure structure,which may result in unreasonable enclosure structure load estimation results.To provide accurate and reasonable wind resistance design for large-span roof envelopes and to provide reference for the optimization of wind resistance design for other similar large-span roof envelopes in the future.In this paper,the wind pressure extremes of a large-span multi-limb roof envelope and its estimation method are studied after considering the wind direction using a roof wind tunnel test data and long-term wind speed and direction data from three regional meteorological stations.In this paper,the wind pressure extremes of a large-span multi-limb roof envelope and its estimation method are studied after considering the wind direction using a roof wind tunnel test data and long-term wind speed and direction data from three regional meteorological stations.1.A directional study of the extreme wind speeds at three international airports in Beijing,Shanghai and Guangzhou was conducted.Based on the daily extreme wind speed and direction data in the IEM database,and by applying and comparing three joint probability distribution models of wind speed and direction based on different wind speed extreme distribution,we obtained the optimal distribution models for the international airports in Beijing,Shanghai and Guangzhou.2.The directionality of the extreme values of wind pressure coefficients of a large-span multi-limb roof structure was investigated.The distribution patterns of the average and pulsating wind pressure coefficients and the non-Gaussian characteristics of the wind pressure coefficients of the wind tunnel test measurement points of this structural model were investigated.To address the limitations of the peak factor method,a modified Hermite moment model method(non-Gaussian solution method)is used to calculate more reasonable extreme values of wind pressure coefficients,and finally the extreme values of wind pressure coefficients under different wind directions are analyzed.3.The relationship between the annual equivalent wind speed and the equivalent wind speed of other time intervals in the Simiu method is derived,and three goodness-of-fit indexes are introduced to judge the effect of fitting the equivalent wind speed at different time periods in order to realize the regularity analysis of the Simiu method based on the measured wind speed and wind direction data of different time periods.The regularity analysis shows that: the daily equivalent wind speed series corresponding to the actual measured data of daily extreme wind speed and wind direction has a better fitting effect;when the annual equivalent wind speed distribution series is used to estimate the wind load of the enclosure structure,there is an underestimation of the extreme wind pressure of the enclosure structure.4.The wind loads of the enclosure structure obtained by fitting the equivalent wind speed based on different time periods are applied to the structural finite element model,The vertical displacements of some nodes of the roof structure under different wind loads of the envelope are analyzed for regularity.The results show that there is no significant correlation between the maximum values of nodal vertical displacements under wind loads of enclosure structures based on daily,monthly,seasonal and annual equivalent wind velocities fitted under wind environments in different regions and the variation of equivalent wind velocities.