Finite Element Analysis Of The "Structure-Insulation" Integrated Wall Of Grain Warehouse

The grain storehouses is the most widely used warehouse type in China,and its storage capacity is about 85% of the total construction capacity.However,the development of the warehouse wall developed slowly for a long time,which seriously affects its grain storage performance.The traditional warehouse wall is generally made of clay brick masonry,which has serious damage to the environment.There are many defects such as large amount of masonry,difficult to control construction quality,low bearing capacity,poor air tightness and poor heat insulation during construction.The “structure-insulation” integrated wall is a new type of grain storehouses wall,which can well solve the above problems of traditional wall and meet the development requirements of green grain storage.This paper studies the“structure-insulation” integrated wall under the pressure of grain side,aiming to provide the theoretical basis for the practical application of the wall in the grain warehouse.The main research contents are as follows:1.Considering the particularity of grain load,this paper designs the detailed structure of the structural and thermal insulation integrated wall components and the flat chamber nodes with high bearing capacity,excellent thermal insulation performance and air tightness.Innovatively designed the construction of new connectors from the aspects of force,heat insulation and construction.The difficulties in the construction process were analyzed and the solutions were found by combining the wall structure and construction technology.The construction process of the “structure-insulation” integrated wall was proposed.2.Based on the isotropic and non-combined wall types,the elastic-mechanical analysis of the “structure-insulation” integrated wall under the pressure of grain side is carried out,and the force mechanism of the inner and outer leaf walls and joints is obtained.And the force model,the equivalent load ratio of the inner and outer wall is derived,and the calculation formula of the axial force of the joint and the bending stress of the joint based on Rayleigh-Litz method is proposed.3.Considering the inner and outer wall thickness,the diameter of the joint,the spacingof the joints,the thickness of the insulation board and the stress and deformation characteristics of the whole warehouse,five sets of test pieces were designed,and the nonlinearity was performed by the large-scale general finite element software ABAQUS.Simulation calculation.The stress and deformation characteristics of each group of walls under the action of grain side pressure are described.The force mechanism is compared and analyzed,and the specific influence of the variation parameters on the wall force is studied.4.Through the finite element analysis,the correctness of the theoretical analysis is proved.It is feasible to verify the theoretical calculation methods and formulas of the inner and outer leaf walls and connectors.The suitable boundary conditions of the wall are proposed.Combined with the results of finite element calculation and theoretical analysis,some suggestions on the thickness of the inner and outer wall and the stiffness of the joint are proposed.