Finite Element Analysis Of Inner Frame Supported Structure Under Steel Silo

For steel soil which is supported by reinforced concrete inner frame structure,because there are both masonry structure and reinforced concrete structure in the inner frame supported structure under the soil,the traditional PKPM software can not determine the distribution of stiffness,so it can not define the characteristics of force and deformation,then we can not achieve the goal of perfect unity of economy,applicability and safety.In view of this problem,this paper takes the actual engineering as the background and use the large finite element software ABAQUS to make the simulation analysis.The main research contents are as follows:(1)Firstly based on the practical engineering,the model of the inner frame supported structure under soil is established through reasonable simplification.The finite element model and constitutive relation of the material,the finite element type of component as well as the constraints and boundary conditions of the model are established,which can be used for reference for the modeling of this kind of engineering.(2)All kinds of loads that acting on the inner frame supported structure under the soil are calculated,and two conditions of empty warehouse and full warehouse are established through load combination.(3)Under the condition of empty warehouse,integral nonlinear analysis of the inner frame supported structure is made with a method of step loading of the horizontal wind load,and the following conclusions are obtained: This engineering meets the safety requirements under empty warehouse condition;The maximum basic pressure value of wind that the inner frame supported structure under the soil can be beard is obtained;The failure mode of inner frame supported structure is obtained under the leading role of horizontal wind load,that is: the outer brick wall is damaged before the internal frame,the damage on the surface of the outer brick wall which is affected by wind load,in particular,the brick wall between the top of the plate to the bottom of the girder is cracked and destroyed.(4)Under the condition of full warehouse,integral nonlinear analysis of the inner frame supported structure is made with a method of step loading of the vertical storage load,and the following conclusions are obtained: This engineering meets the safety requirements under full warehouse condition;The maximum storage volume of steel tube that the inner frame supported structure under the soil can be beard is obtained;The failure mode of inner frame supported structure is obtained under the leading role of vertical storage load,that is: the internal frame is damaged before the outer brick wall,in particular,around reinforced concrete column bottom is cracked and destroyed.(5)Finally,the engineering proposals for coordinating the inner frame structure with the external brick walls are further proposed.On the basis of the current design,we should increase the lateral stiffness of the outer brick wall which is affected by wind load,in particular,the brick wall between the top of the plate to the bottom of the girder,and increase bending stiffness of four reinforced concrete columns in inner frame structure.