Assessment of Dynamic Collapse of Container Ship Subjected to Whipping

Abstract

Nowadays the demand for larger container ships has increased dramatically as world trade continues to grow and with the marine industry requirement for more energy efficient ships. Springing and whipping phenomena are critical for the design and operation of these large containers. Nowadays the interest on the whipping and springing stress on the hull girder loadings has increased more and more. Based on the MOL Comfort, structural analysis concerned with the dynamic effects on the hull girder loading are especially done. Wave impact loads are important in the structural design and wave impact causes both local and global effects. One of the critical issues on global effects for large container ships is the vibration of the hull girder due to wave impact which leads to excitation of whipping responses of the ship’s hull girder. Time domain whipping analyses were carried out for a large container ship by using a computational tool. In this thesis, the dynamic collapse of the container ship will be performed using the cargo hold model of 14000TEU container ship when the model is subjected to the whipping load and without whipping load. In dynamic analysis, the analysed model is imposed with the material strain rate and we will analyse whether the material strain rate influence the strength capacity. In this thesis, we will also investigate whether an increase in the hull girder capacity strength can be found for the case including whipping load compared to the case without. My thesis is aimed to implement the structure and fulfill some of the requirements for container ship