Residual ultimate strength of stiffened panel including crack-like defects under longitudinal uni-axial thrust is investigated. A single transverse/longitudinal crack with different length and location is considered and is introduced into the continuous stiffened panel model. A shell finite element (FE) modeling is adopted and the crack is modeled as a displacement discontinuity in the FE model by introducing double nodes along the segment. A series computation of nonlinear FE analysis has been carried out employing LS-DYNA to examine the ultimate strength and influence of the cracks to the collapse behaviors. Three types of panel thickness and four sizes of longitudinal T-shaped stiffeners are assumed. The reduction characteristics of the ultimate strength and change of collapse behaviors are discussed through the nonlinear FE computations.