Computer Program for Ultimate Strength Analysis of Ship Hulls Subjected to Moment, Torque and Shear

摘要

This report describes a computer program for the determination of the behavior and ultimate strength of longitudinally stiffened ship hull girders of single-cell cross section subjected to moment, shear and torque. The logic of the program and of its subroutines is presented. The compression flange is assumed to behave as if it was composed of independent beam-columns whose axial load vs. deformation relationship is established by another computer program. Axial response of the remainder of the section up to the buckling or yielding stress is assumed to be of a bi-linear, elastic-plastic pattern. After buckling, the shear response of the girder webs is considered to be according to the multiple tension-field theory. This program can maintain plane section or accommodate any degree of warping as specified by the user. The input for the program consists of the geometrical and material properties of the girder segment, and of the relative values of the forces applied to the cross section: moment, shear and torque. The output gives the curvature of the girder segment and the corresponding load parameter which is related to the bending moment, shear and torque acting on the cross section. All the principal variables and the formats of the input and output are defined. However, the actual listing of the program is not included in the report; it is available upon request.