| With the rapid development of China’s economy and the establishment of China’s aviation hub strategic positioning,China has become a veritable airport construction power,and there is a growing demand for construction and development trend.At the same time,under the influence of global warming,the phenomenon of wind disaster caused by special climate represented by typhoon has a tendency of increasing frequency and aggravating disaster degree in all parts of the world,which makes domestic and foreign scholars pay special attention to the damage caused by typhoon of large-span roof structure.Terminal roof structure is relatively low,body shape is more complex,in the atmospheric boundary layer shear wind speed change is big,area of turbulence degree is high,the surface flow around a blunt body and fluid-structure coupling effect is complex,cause instantaneous extremum wind load on the surface of the roof is too large,and the fluctuating wind pressure accompanies a non-stationary and non-gaussian characteristics,which can lead to partial or whole terminal roof structure damage.However,the existing researches on the wind resistance of long-span roof are mostly based on theoretical analysis and measured data,etc.,which have the problem of simplification of the theoretical system.It is difficult to truly reflect the specific wind profile and landing attenuation effect of mesoscale typhoon field,not to mention the nonlinear aerodynamic performance problem of large-span roof structure such as terminal building in the real typhoon field.In view of this,this paper first introduced the Weather Research and Forecast(WRF)model to conduct high-resolution simulation of super typhoon megi,and then obtained the boundary layer wind profile by nonlinear least square method after analyzing the typhoon field characteristics.Then,a proposed terminal in coastal areas as the research object,the two-way fluid-structure coupling simulation technology(Fluid Structure Interaction,FSI)of the different kinds of wind field and wind Angle and different model under the condition of nonlinear aerodynamic force of a systematic study,so as to reveal the typhoon wind field Structure of large-span mechanism of nonlinear aerodynamic performance,mainly in four aspects:1.Determination of medium/small scale nesting scheme: the mesoscale WRF model and small scale CFD numerical simulation are introduced respectively,and then the medium/small scale nesting scheme is determined according to the characteristics of the two simulation methods,and the computational domain encryption scheme and nesting process are given.2.Mesoscale typhoon field simulation and result analysis: based on WRF model,the refined simulation of "merandi" typhoon was conducted,and the information of simulation region selection,physical scheme selection,mode parameter setting and wind field results were introduced in detail.On this basis,the near-surface wind profile of typhoon is obtained by fitting,and the typhoon simulation path is compared with the real path to verify the correctness of typhoon simulation.3.Two-way fluid-solid coupling simulation of terminal buildings based on typhoon wind field: numerical simulation of typhoon field with different wind field types,wind direction angles and different terminal models is carried out by combining small scale FSI numerical simulation method.The response differences of roof under different working conditions were analyzed from the aspects of roof surface displacement,von-mises equivalent stress and von-mises equivalent strain.4.Nonlinear aerodynamic analysis of terminal roof: the flow field information around the terminal roof considering the roof vibration deformation is obtained by combining small scale FSI numerical simulation method.Based on this,the nonlinear aerodynamic performance of the terminal roof is analyzed in terms of the wind field around the roof,the average wind pressure on the roof surface,the pulsating wind pressure and turbulent kinetic energy,and the time-frequency domain characteristics of the nonlinear wind pressure.Finally,the main research results of this paper are summarized.The main results are as follows: "meranti" in this paper has a good simulation effect,and the fitting typhoon profile index is 0.113.Due to the influence of turbulence fluctuation,the maximum displacement probability is the highest.It indicates that the windward,corner and slope roof are prone to stress concentration.The time history of wind pressure in downslope roof and windward area of typhoon wind field is greatly affected by pulsating wind,while the time history of wind pressure on roof surface under good wind field is greatly affected by average wind. |
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