Studying the Problem of Geometric Parameters Simulation of Hull Structures Deformed Units

Abstract

The most common case of deformation of frame T-beams is taken as the object of research on the accuracy of modeling the geometric parameters of the cross-section of the deformed nodes of ship hull structures. The exact, determining the strength characteristics, geometric parameters of the cross-section of a deformed wall of a frame beam and a beam with an attached sheathing belt in a deformed wall with several models replacing the original section in succession, are compared in the paper. The scanned cross-sections of beams models with a deformed wall are taken as the evaluated objects. The models have several options for the ratio of the wall height to its thickness and different forms of buckling of the beam wall. Based on the simulation results, a comparative assessment of the values of these parameters is given and a conclusion about the accuracy of the simulation results sufficient for practice is made. In addition, it is shown that the modeling accuracy allows satisfactorily assessing the geometric parameters of the strength of the cross-section of the frame beams of the ship’s set with a deformed wall without direct access to the beam and assessing the zone and type of wall deformation - by measuring the deformation of the outer side of the skin at the attachment point of the beam. A composite model, representing a set of an undeformed T-beam with a wall of the same thickness, height equal to the height of the deformed beam wall and a sheet element in the plane of the beam wall adjacent to the skin, is recommended as the main one. The height of this element is 2/3 of the height of an undeformed beam with a cross-sectional area equal to the difference between the wall areas of the undeformable modeled and imitated beams. In addition, the accuracy assessment of determining the geometric parameters of the strength of the cross-section of a T-beam with an attached sheathing belt in the case of a deformed wall and its reinforcement with sheet elements in the plane of the wall is given. It is concluded that the use of this modeling method allows one to obtain models convenient for the analytical description with their satisfactory accuracy.