Progressive collapse method for ultimate hull girder strength assessment

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Authors
  1. Smith, M.J.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
This memorandum provides a description of the theory and use of the progressive collapse method (PCM) for deterministic evaluation of ship hull girder ultimate strength. Bi-axial ultimate strength is considered, in which bending of a ship can occur about any axis in a cross-sectional plane perpendicular to the longitudinal axis. Two algorithms are examined for determining the ultimate strength: moment-curvature analysis, in which the curvature is incremented, and bi-axial strength analysis, in which the moment is incremented. The merits of these two algorithms are considered for determining interaction curves defining the envelope of bi-axial ultimate strengths. The load-carrying characteristics of individual structural units are also examined, and a review of the theory and assumptions is given. Two approaches for generating load-shortening response curves of longitudinally stiffened panels are considered in detail: one involves interpolation from precalculated load-shortening curves and the other involves the use of design equations. The implementation of the PCm in the RESULTS (RESidual and ULTimate Strength) programme is described, and a user's guide is provided. Validation of the code is performed using a steel box girder structure and two hypothetical damage case studies of the HALIFAX class warship.

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Keywords
Hull girder strength;Load shortening curve;Frigates (Halifax class)
Report Number
DREA-TM-2001-145 — Technical Memorandum
Date of publication
01 Oct 2001
Number of Pages
91
DSTKIM No
CA020266
CANDIS No
517010
Format(s):
Hardcopy;Document Image stored on Optical Disk

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