Abstract
This paper presents a dynamic analysis of a prestressed stiffened circular cylindrical shell subjected to external distributed pressure using the dynamic stiffness method. This approach is based on the first order shear deformation theory founded on love's first approximation theory. Natural frequencies are easily processed. The dynamic stiffness matrix has been built. The formulation of this element requires coupling pre-stressed shell and circumferential stiffener. The vibration analysis is performed with numerical examples to determine the performance of this model and the effect of presetress and stiffener on the frequency spectrum. The response of the system is determined with applied equivalent loads on element boundaries. Compared to the finite element method, the proposed element has many advantages such as the model size, the computing time, the accuracy and the higher precision.