Pages 101-112
Research on the stress acting on the side longitudinal girder is requested because some fatigue accidents have been reported. This paper shows the research results on the following two problems. 1. Mutual interference effect between the axial force and the lateral force acting on the side longitudinal girder of ships on the stress. 2. Nonlinear effect of pressure acting on the ship side hull portion near the free surface on the stress. On the first problem, the approximated probability density function of the stress can be obtained. As the results, we can discuss the mutual interference of them. On the second one, by using the theoretical mean and variance values of the nonlinear pressure, the quasi-linear stochastic investigation on the nonlinear pressures and loads can be performed. By using these results, the long term prediction of the stress is carried out and is compared with the experimental results of the actual ships. The proposed results agree with the experimental one.
