Finite element large deflection static analysis of shallow and deep stiffened shells
Geometric nonlinear static analysis of shallow and deep stiffened shells has been conducted on the basis of a combination of Allman's plane stress triangle and Discrete Kirchhoff triangle (DKT) plate bending element. The compatibility condition at the shell beam junction is ensured as the same displacement function used for both the shell and the stiffener element. The formulation of the stiffener is done in such a manner that it can be placed anywhere within the shell element. The large deflection equations are based on von Karman's theory. An iterative solution procedure, either NewtonRaphson method or modified Riks method, is employed to trace the nonlinear equilibrium path. The nonlinear static analysis of deep stiffened shell has been done for the first time. A variety of numerical examples are presented to demonstrate the versatility and efficiency of the present stiffened shell element.
finite element large deflection static analysis stiffener shell