Wind Pressure Field Reconstruction And Prediction Of Large Span Roof Structure Based On POD

The large-span roof structure has been favored by structural engineers due to its large space capacity,beautiful architectural shape and good mechanical properties.Due to its light weight,small damping,low stiffness,low natural frequency and low frequency,such structures are located in the near-Earth region where the wind speed changes greatly and the turbulence intensity is high in the atmospheric boundary layer,and are sensitive to wind loads.Because the large-span roofs structure is complex,technical standard often fail to provide corresponding body shape coefficients in China,which are usually determined by wind tunnel tests.However,due to various factors of wind tunnel test,the number of wind pressure measuring points is very limited,which is not enough for the study of wind load of large-span roof structures.Therefore,this thesis reconstructs and predicts the wind pressure field of the roof of Ganzhou Golden Airport based on POD.The main work of this thesis is as follows:Briefly introduce the development status of the large-span roof structure and the characteristics of wind field in the atmospheric boundary layer,and describe the endangers caused by the wind disaster.The development status of wind engineering is introduced,and put forward the importance of wind pressure reconstruction because the wind pressure point is limited.Simulating class B atmospheric boundary layer turbulence,determining the flow field parameters of the experimental turbulent flow field,measure the surface pressure distribution of a 1:100 model of the Golden Airport in the turbulent flow field based on the pressure test.Based on wind tunnel pressure test results,using the top 10,20,40 proper mode achieve the wind-pressure field reconstruction based on POD,and investigate the validity of the data obtained by energy ratio,statistical characteristics,wind pressure program column,power spectrum and coherence function.Using the bilinear method,bicubic method,the nearest point method and the V4 interpolation method,adopt the top 40 proper mode directly predict and quadratic predict the surface wind pressure field of the model.The accuracy of the prediction results of the four methods in direct and quadratic prediction is discussed.This thesis is based on actual engineering research,and the conclusions obtained can be used as reference for reconstruction and prediction of other similar large-span roofs.