Abstract
This paper deals with progressive collapse behavior of mooring system of very large floating structure. We have studied progressive collapse behavior of mooring system of barge type floating structure which is installed in calm sea, moored by dolphin mooring, and protected by break water. In this report, floating structure installed in open sea is considered. The wave condition may be so strong that semisubmersible type is reasonable rather than barge type. The water depth may be so large that it should be moored by inclined tension legs.
Time series program which models in-plane elastic response as a beam and anti-plane elastic response based on the theory of plates is made and progressive collapse behavior is simulated.
An experiment was made on collapse behavior under regular and irregular wave using 1/333 scale model of semisubmersible type floating structure moored by inclined tension legs. Mooring rope is set to be cut off from floating structure when the load on the rope is over preset value.
