INFLUENCE OF SHIP TYPES ON TRACTIVE FORCES OF MOORED SHIPS ACTING ON MOORING POSTS AND BOLLARDS

Abstract

 The standard values of tractive forces of moored ships used in mooring post design are described in the Japanese technical standards for ports and harbors. They were set based on the calculation results of the tractive forces by the simulation of oscillation for moored cargo ships subjected to wind loads. On the other hand, wind pressure areas are so large for container ships and passenger ships compared with cargo ships. It is therefore more appropriate to select mooring posts and bollards by using the tractive forces calculated by the simulation of oscillation for moored ships. In this study, we carried out the simulation of oscillation for cargo ships, container ships and passenger ships subjected to wind loads. We then compared and evaluated the influence of ship types on the tractive forces acting on mooring posts and bollards. We also confirmed the applicable range of the standard values of tractive forces in the Japanese technical standards.