A Reduction Method for Deflective Deformation Plate Frame Structure in Hull Girder

Abstract

The invention relates to a method for reducing flexural deflection grillage structures in hull girders. The method comprises the following steps of: 1, determining a flexural deflection function of a grillage structure; 2, calculating a bearing capacity of the flexural deflection grillage structure through finite element software when the flexural deflection grillage structure is stressed axially, and determining an effective sectional area of the flexural deflection grillage structure; 3, determining reduction coefficients of the flexural deflection grillage structure; and 4, fitting a reduction formula of the flexural deflection grillage structure according to reduction coefficients of the grillage structure under different initial flexural deflections. According to the method, the reduction problems of grillage structures with initial flexural deflections is effectively solved; compared with whole box pile structures, the grillage models are simple and convenient to establish and relatively short in calculation time, and reduction laws of flexural deflection grillage structures in the box pile structure models can be effectively reflected; and the method provided by the invention is complete, practical and easy to realize, and is capable of carrying out calculation by combining actual conditions of the structures.

Description

Technical field [0001] The invention relates to the technical field of residual strength evaluation of ships and marine structures, and in particular to a method for reducing the deflection deformation plate frame structure in the hull girder after the deflection and large deformation caused by the explosive load. Background technique [0002] With the development of anti-ship missiles, the design principle of the semi-armor-piercing warhead is to rely on the impact kinetic energy of the projectile, penetrate the side shell and enter the hull to explode, give full play to its destructive power, and cause huge damage to personnel and equipment. A large number of existing literatures have found through experimental research and numerical simulation that local damage or local plastic deformation damage may occur to the slab structure of the cabin under explosive load. The local damage of the ship is mainly manifested as damage cracks or cracks, and local plastic deformation damage. ...

AI Technical Summary

Problems solved by technology

However, currently there are only reduction methods for rectangular plates or frame girders with initial deflection deformation, and there is a lack of reduction methods for plate frame structures with initial deflection deformation in hull girders

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