Finite Element Analysis Of The Force Of The Silo Under The Storage Of Grain

Food is the strategic material of the country and the daily necessities of the people.ensuring food security is not only the basic condition for the sound and rapid development of the national economy,but also the important guarantee for promoting social stability and harmony and the strategic basis for ensuring national security.With the economic development and the improvement of people's living standards,the people's demand for high quality grain and oil engineering to further improve,according to the market demand classification,storage and storage demand gradually highlighted,for classification processing,effectively guarantee the quality of food,and ultimately to achieve high quality and good price,increase the supply of green high quality food products to create conditions.Grain storage is a key point to ensure the quality of grain and oil.therefore,the analysis of grain storage force based on grain storage is of great practical significance to ensure the safety of grain storage structure under different storage conditions.In this paper,taking a grain storage project in Guangzhou as an example,the effective calculation parameters are obtained by indoor test,and combined with finite element numerical calculation based on large deformation,the static and dynamic pressure of granary under simulated load and the interaction between granary and grain under simulated grain action,and the influence of the static and dynamic pressure on the structure of granary,which provides the design and calculation basis for the granary reconstruction or new construction project of divided granary storage.The main contents of this paper are as follows:(1)Experimental determination of grain mechanical parameters.Taking the stored wheat as a representative,based on the improved geotechnical triaxial apparatus,the triaxial shear test of wheat was designed,which not only obtained the conventional internal friction angle of wheat,but also obtained the conventional dilatancy angle which is difficult to obtain.The storage parameters are provided for the constitutive model of wheat under the subsequent numerical simulation.(2)The ultimate load of the silo structure is analyzed by direct load.Firstly,the shell element and beam element in the software are selected to establish the split silo model,and then the grain load on the silo wall and silo bottom is calculated according to the grain physical and mechanical parameters and janssen theory.Then the stress and deformation of the silo under this load are analyzed.At the same time,the limit state of silo deformation is analyzed by changing the grain load value and other parameters.(3)The static pressure and dynamic pressure of silos under grain action were studied by using the interaction between wheat and silos.Three-dimensional solid element was used to establish the numerical model,and the d-p constitutive model was added to the wheat block.the static pressure under different storage conditions was studied and compared with the calculated values.On this basis,ale adaptive mesh generation method is used to solve the problem of large deformation during unloading,and the variation law of the side pressure of the silo wall under different working conditions is analyzed to obtain the dynamic pressure coefficient of the silo wall.At the same time,the stress and deformation of the silo wall and floor are analyzed,and the structural stress of the silo storage under different working conditions is compared and analyzed.