“…to improve stiffness of the structures. Many different ways are applied to analyzing plate structures in general as well as stiffened plate structures in particular; they are listed as Rayleigh-Ritz method [1], finite difference method [2,3], finite element method (FEM) [4][5][6][7][8][9][10][11][12][13][14][15], constraint method [16,17], mesh-free method [18][19][20], semi analytical finite defference method [21,22], finite strip method [23][24][25], boundary element method [26,27], integral transform approach [28], etc. The most important issue of this type of structure is the connection between the plate and the stiffeners.…”