Study On Wind Load For Drying System Equipment Of Fiberboard Production Line And Structural Performance Of Steel Bracket

Steel structure is a special metal structure made of structural steel.It is widely used in industry and large civil buildings because of its many outstanding advantages,such as material saving,low cost,fast construction cycle and good environmental tolerance.Wind load is the most common load in structural design,which has a very important impact on the stability of the structure.The steel support for indu strial equipment is a kind of high-rise open steel structure,which is sensitive to wind load.However,at present,there is little research on the wind load of this special steel structure,while the existing design code for civil building steel structure can not meet the design requirements of steel support for industrial equipment.Therefore,in view of the shortcomings of the existing research,in order to meet the engineering design needs of steel support for industrial equipment support better,this p aper takes the cyclone separator and its steel support of drying system of fiberboard production line as the research object,and studies the structural mechanics problems such as the stress and deformation of cyclone separator group and its steel support under wind load.The relevant research contents and results are as follows:(1)Based on the actual characteristics of force and deformation behavior of cyclone separator group under wind load,the unidirectional sequential coupling method between flow field and cyclone separator group was established by summarizing the existing fluid structure coupling theory and its numerical calculation methods;On this basis,the mathematical models of hydrodynamics and structural statics were established respectively,and the coupling solution of them was realized based on ANSYS Workbench numerical calculation platform.(2)Referring to the load code for building structures and combined with the specific geometric characteristics of cyclone separator and its steel suppo rt,20 wind load cases composed of different wind angles and different wind pressure levels were designed,and numerical calculations were carried out respectively.The stress behavior of cyclone separator group under different wind direction angle and win d pressure level was studied in detail,and the pressure and velocity distribution were analyzed and compared from the perspective of wind field distribution law.The results show that the pressure value and total pressure value in each direction of cyclone separator group are quite different under different wind direction angle and wind pressure level.The overall pressure of the support decreases significantly with the same wind direction,but the total pressure of the support decreases with the wind direction.When the wind direction angle and wind pressure level are unchanged,the pressure value in the vertical direction is significantly lower than that in the other two directions;The total pressure value under wind direction angle θ=41° and wind direction angle θ=221° is large,and its value reaches about 1700 kn.The total pressure value under the wind direction angle θ=90°,wind direction angle θ=180° and wind direction angle θ=270° is about 900 kn.When the wind direction angle is constant,the total pressure shows a similar decreasing relationship with the decrease of wind pressure level.(3)On the basis of wind field prediction,the stress behavior of steel support under different wind angles and different wind pressure levels was studied in d etail,and the pressure and velocity distribution were analyzed and compared from the perspective of wind field distribution law.The results show that with the decrease of wind pressure level,the reaction force of steel support under each wind angle show s an obvious downward trend;When the air blows to the steel support along the axial direction(i.e.when the wind direction angle θ=90°,180° or 270°),the supporting reaction force of the steel support against wind pressure is greater than other wind directions.In terms of deformation,when the air blows to the cyclone separator along the axial direction,the maximum deformation of the steel support is relatively high,and its maximum value is 34.5mm,which occurs when the wind angle is θ=270° and the wind pressure is extremely high.The calculated value of the maximum deformation decreases significantly with the decrease of the wind pressure level.However,when the air blows to the cyclone along the diagonal direction,the maximum deformation of the steel support under different wind pressure levels has little difference.(4)Based on computational fluid dynamics,the shape coefficient of cyclone separator group was accurately estimated through the statistics of specific flow field distribution and wind load force,which replaces the original empirical estimation as an important input parameter in the engineering design process,so as to improve the existing engineering design method of steel support of fiberboard drying system,and significantly improve the reliability and economy of the engineering design scheme.This work can make up for the lack of research in the field of steel support for industrial equipment to a certain extent and has a certain theoretical guidance for the stress analysis,engineering design and safety verification of steel support for industrial equipment under wind load.