Theory and numerical procedure are presented to determine the stress-intensity factors for a partially cracked typical stiffener and a partially cracked splice stiffener in a stiffened panel subjected to a uniaxial uniform remote stress normal to the crack. The translational spring element and the beam element with special boundary conditions are investigated for the simulation of flexible fasteners. The finite-element procedure was applied to the problem. From the finite-element solution, the stress-intensity factors were determined by using the displacement method and the strain energy release rate method. Results are presented as stress-intensity configuration factors, Y, for various values of crack lengths, stiffening ratios, stiffener spacings, and fastener flexibilities. The crack growth lives computed from finite-element solutions are compared with test data of panels containing a partially cracked typical stiffener subjected to constant amplitude cyclic loading and spectrum loading. The correlation between the test data and the analyses is very good.