Study On Stability Of Floor-standing Steel Silo Considering Interaction Between Bulk Material And Structure

With the development of industry and agriculture,various industries have higher and higher storage requirements for warehousing structures,and the safety of warehousing structures has received more attention.Floor-standing steel silos are widely used due to their advantages of large capacity,few consumables and short construction period.During the loading and unloading process of the steel silo,the complex side pressure and friction will cause instability and damage to the silo wall,which is manifested as folds,diamonds and elephant feet on the silo wall.Therefore,it is of great engineering significance to study the stability of silos.In this paper,the interaction stiffness of silo structure and bulk material under the action of bulk pressure is studied by numerical method;for deep silo,medium-deep silo and ultradeep silo,the interaction relationship between bulk material and silo structure is considered,the stiffness of bulk materials is simplified as Winkel linear springs and introduced into perfect and imperfect steel silos.The structural stability of floor-standing steel silos is studied by using Buckle method and Riks arc length method through finite element method.The effects of geometric nonlinearity,material nonlinearity,initial geometric defects,stiffness of interaction between structure and bulk material on the stability of floor-standing steel silos are studied.The main research contents include:(1)The interaction relationship between the radial deformation and the lateral pressure change between the silo wall and the bulk material in the whole process of loading and unloading of the silo structure is studied by numerical method,and the stiffness of the interaction between the silo body structure and the bulk material is obtained.(2)For the floor-standing perfect steel silos and non-perfect steel silos with different height-diameter ratios under the central discharge.The horizontal pressure and vertical friction force of the bulk material are applied to the silo wall,and the silo structure is subjected to linear bifurcation,elastic geometric nonlinearity,geometric and material nonlinearity,elastic geometric nonlinearity considering defects,geometric The buckling instability mode of the steel silo under different height-diameter ratios was clarified,and the load proportional coefficient-displacement relationship of the steel silo was obtained by the Riks arc length method.The influence of internal force and displacement of silo,and the quantitative analysis of steel silo using capacity rate as an indicator to evaluate the economics of floor-standing steel silo.(3)The stiffness of the interaction between the silo body structure and the bulk material during the loading and unloading process of the steel silo is introduced as an influencing factor for the stability of the steel silo.Considering the interaction between the bulk material and the structure,the stiffness of the bulk material is introduced,and the buckling stability analysis of the steel silo,such as linear bifurcation,elastic geometric nonlinearity,geometric and material nonlinearity,and geometric and material dual nonlinearity considering defects,is carried out respectively.The relationship between the load proportional coefficient and the displacement of the steel silo was obtained by the Riks arc length method,and the critical displacement deformation value of the steel silo was analyzed.The buckling modes of floor-standing steel silos under different bulk material stiffnesses were clarified,and the effects of bulk material stiffness on the horizontal side pressure,hoop bending moment and radial displacement of steel silos.Finally,the simulated values obtained under the storage stiffness-steel silo model are compared with the theoretical values of the Eurocode.