A Conventional VLCC hull design has a large number of complicated connections between the longitudinals and the transverse web frames. The production cost of these joints is relatively high. Thus, new design suitable for rational welding procedures are of interest. A probabilistic fatigue damage model is established for the purpose of a comparative study of a conventional slot structure and a new production-friendly design without a flat bar stiffener. The shape of the cutout in the web frame is for the new structure determined by use of a finite-element-based optimization program.Numerical results show that the fatigue life for the shape-optimized slot is increased by a factor of 6 compared to the conventional structure.
|Publication status||Published - 1998|