Authors: Masaoka, Koji; Mansour, Alaa

Source: Journal of Ship Research, Volume 52, Number 3, September 2008 , pp. 227-237(11)

Publisher: Society of Naval Architects and Marine Engineers (SNAME)

Abstract:

The behavior and ultimate compressive strength of stiffened plates with imperfections have been investigated in this paper using a nonlinear finite element method. The imperfections considered consisted of initial deflection and residual stresses. Several types of initial deflections were investigated, including those that may initiate stiffener column buckling and stiffener tripping. Extensive parametric study was conducted in order to systematically determine the impact of these initial imperfections on the ultimate compressive strength of stiffened plates of various geometric properties and stiffener shapes. The objective of the study was to develop simple design equations for determining ultimate strength based on finite element parametric study. The developed algebraic equations reflect the impact of imperfections on ultimate strength. A Perry-Robertson type equation was developed to incorporate the influence of the imperfections. It was found that under certain conditions a hybrid type mode of failure was necessary to accurately represent the behavior of stiffened plates with imperfections, in addition to the usual plate and stiffener failure modes. It was also found that column buckling type initial deflection is the most important form of imperfection.

Keywords: COMPRESSIVE ULTIMATE STRENGTH; STIFFENED PLATE; IMPERFECTION; INITIAL DEFLECTION; WELDING RESIDUAL STRESS; NONLINEAR FINITE ELEMENT METHOD

Document Type: Research article

Publication date: 2008-09-01

More about this publication?

• The Journal of Ship Research is a quarterly publication providing highly technical papers on applied research in hydrodynamics, propulsion, ship motions, structures, and vibrations. While the Journal requires that papers present the results of research that advances ship and ocean science and engineering, most contributions bear directly on other disciplines, such as civil and mechanical engineering, applied mathematics, and numerical analysis. High quality papers are contributed from the U.S., Canada and overseas, with representation from established authorities as well as new researchers.
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• In this Subject: General & Civil Engineering ,  Hydraulic & Environmental Engineering ,  Mechanical Engineering
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