Analysis Of Strength And Stability Of Large-diameter Flat-bottom Squat Steel Silos Under Wind Loading

As the diameter and height of flat-bottomed cylindrical steel silos get bigger, theimpact of wind load on the silo structure is larger, especially under strong wind load,empty silos or silos with little bulk solid are prone to failure. Research on strength andstability of large-diameter flat-bottom squat steel silos under wind load is taken usingfinite element softwareANSYS.Linear stress analysis is carried out to get the circumferential and verticaldistribution of circumferential stress, axial stress, shear stress and the Mises stress ofsteel silo under wind loads. Eigenvalue buckling analysis is carried out to get thebuckling mode and eigenvalue, and understand preliminarily the main parameters thatinfluence buckling bearing capacity of silo structure: the wall thickness, the location ofwall stiffening ribs, the size of wind rings and the stacking height within the silo.The nonlinear buckling analysis on steel silos, accounting for material plastic andgeometric nonlinear is carried out to make sure the influence of wall thickness and stackheight on the bearing capacity. when the overall dimensions is determined, thethickness of the silo is the main factor influencing buckling. with the height of materialincreased, silo is less prone to buckling.At last, the influence of imperfection and the amplitude of imperfection is alsodiscussed. when the imperfection is accounted, the buckling bearing capacity of the silodecreases heavily, and with the amplitude of defect increases, it decreases gradually.