| The ultimate bearing capacity of hull structure is one of the key indexes reflecting the safety and reliability of hull structure,and is generally evaluated by static method in engineering design.With the development of large-scale and high-speed ships at sea,large cruise ships are more likely to encounter extreme wave sea conditions during sailing.At this time,the safety of cruise ship hull structure is more obvious due to wave slamming load.Therefore,it is necessary to reasonably evaluate the structural response and buckling characteristics of cruise ship hull structure under dynamic load.Different from the traditional study on static ultimate strength,the study on dynamic response and buckling characteristics of ship structures under dynamic loads is more complex,and the influence of loading time-history effect and material dynamic constitutive factors must be fully considered.Therefore,it is of guiding significance to study the structural dynamic response and buckling characteristics of typical plate structures of cruise ships under dynamic loads,explore the key influencing factors,and analyze the difference between them and static buckling characteristics for structural design and safety evaluation of large cruise ships in China.This article mainly USES the nonlinear finite element analysis method,to a large cruise the research object,the stiffened plates with simple structure,large cruise typical deck plate frame structure,including opening web plate frame structure,abnormal high opening plate frame structure,and simplify the liner model of structure dynamic response and dynamic buckling characteristic has carried on the exploration,and the static ultimate strength and buckling characteristics were compared.The research content mainly includes the following aspects:(1)Numerical analysis method of ultimate strength of stiffened plate structure.In this paper,the theoretical research basis of stiffened plate structure in hull is introduced,the failure modes,initial defects of stiffened plate structure and the approximate calculation method of static ultimate strength of stiffened plate are introduced.Taking the simple stiffened plate as the research object,the dynamic ultimate strength and its influencing factors are investigated by nonlinear finite element method.(2)Analysis of dynamic strength and influencing factors of typical plate frames on cruise ships.The static ultimate strength and failure mode of deck truss with beam and girder are studied by nonlinear finite element method,and the effects of boundary conditions,initial defects and frame parameters on the dynamic ultimate strength of deck truss are studied.(3)Analysis of structural response and buckling characteristics of cruise plate frame under dynamic load.Considering the actual dynamic load on the deck structure,the simplified half-sine dynamic load is adopted to analyze the influence of load parameters,deck surface pressure and web opening on the dynamic response and buckling characteristics of the deck frame.The static ultimate strength and failure mode of special-shaped open plate frame of cruise ship are analyzed,and the dynamic response process of large open plate frame under dynamic load is studied.(4)Dynamic response analysis of large cruise ship structure under dynamic bending moment.The static ultimate strength and failure mode of the simplified cruise ship model under vertical state were studied by nonlinear finite element method.Considering the actual dynamic bending moment load on the cruise ship model,the dynamic response of the simplified cruise ship model under dynamic bending moment load was studied based on the dynamic analysis method.The dynamic ultimate strength of the simplified cruise ship model under dynamic bending moment was evaluated by taking the Angle of the cruise ship model under static limit state as the reference value.The influences of dynamic bending moment type,time and peak of dynamic bending moment on the dynamic response of cruise ship are discussed. |
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