Study On Wind Resistance Of Long Span Conical Roof Structures

With the development of modern economy and science and technology,there are more and more large-span roof structures,and the types of structures are more and more complex.Wind load is often one of the main control loads of these complex structures.Although there are many studies on the wind resistance of long-span roof structures at present,the accidents of wind load destruction of long-span roof structures are still common,which shows that the theory of wind resistance design of long-span roof structures is not mature enough.In this context,based on CFD numerical simulation platform,the wind resistance performance of long-span single-cone roof structure,long-span continuous two-cone roof structure and long-span continuous three-cone roof structure at different wind direction angles and roof slope angles is studied.This paper mainly studies the following aspects:(1)On the basis of reviewing the main research results of predecessors,the calculation methods of numerical simulation,turbulence model,discrete format of governing equation,boundary conditions,numerical iteration method and determination method of calculation results are determined.Then,the wind load performance of large-span single-cone roof structure under 12 different wind directions and roof slope angles is analyzed by fluent software.The isoline diagram of wind pressure coefficient and the variation law of shape coefficient are obtained,and the practical calculation formula of wind load shape coefficient is concluded and summarized.(2)The wind load performance of enclosed double-slope roof is analyzed by the numerical simulation method,and the wind pressure coefficient and shape coefficient are obtained.The accuracy and validity of the numerical simulation method are verified by comparing with the shape coefficient of enclosed double-slope roof in the Code for Building Load in China.(3)After verifying the accuracy of the numerical simulation method,the method is used to analyze 12 working conditions of two long-span continuous pyramids and three continuous pyramids at different roof slope angles and wind direction angles.The wind pressure coefficients under different working conditions are obtained,the wind load shape coefficients are calculated,and the practical formulas for calculating the shape coefficients of the two structures are summarized and summarized.(4)According to the wind tunnel test data of the terminal building of Zhangjiajie Lotus Airport,the wind pressure coefficient and the shape coefficient of the main building are analyzed and obtained.Then the shape coefficient calculated by the practical calculation formula is compared with that calculated by the practical calculation formula.It is proved that the error between the shape coefficient obtained by the practical calculation formula and the wind tunnel test results is within the controllable range,which shows that the practical calculation formula has certain practical engineering application value.(5)On the basis of the previous research work,the shape coefficients of three structural forms are summarized and summarized,and a general formula for calculating the shape coefficients of large-span conical roof structures is proposed.It provides a reference formula for wind resistance design of this kind of long-span conical roof structure.