Study On Ultimate Strength And Damage Resistance Performance Of Ship With Longitudinal Box Girders

With speedly develop of modern anti-warship weapons,the environment of worship encounters in battales is more and more cruel.Once its active defence system is broken,deadly threaten to the worship's is coming.In this condition,the evaluation of worship's vitality and study of worship's damage resisitance performance is more and more important to the navy.The present paper,on the basis of ultimate performance of ship's structure,define the damage resistance performance of structure,and moreover,study the mechanism and effect of box-girder to the ultimate and damage resistance performance of ship.The following items are studied in this paper:(1)Summarize relative theory about ultimate strength of ship hull structure,study FEM techniques in dealing with material and geometrical nonlinear.Give focus on model size,boundary and choice of numerical method.(2)Study the mechanism and effect of box-girders to strengthen the ultimate performance of ship structure.Give out design principle about middle and boumdary box-girder separately.(3)Gather damage effect of every anti-worship weapon, summarize and analyze damage rules of grade and location,and then give reasonable damage model for further mathematical analysis.(4)By studying the residual strength of deck grillage and hull girder at every damaged status,analyze influence rules of every damage on ship's residual strength and strengthing effect of box-girder on damaged ship.The conclusions and suggestions given in this paper have good reference value to ship's damage risistance performance research and structure design.