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Structural Engineering and Mechanics   Volume 11, Number 5, May 2001, pages 519-534
DOI: https://doi.org/10.12989/sem.2001.11.5.519
 
Effects of initial imperfections on nonlinear behaviors of thin-walled members
M. Ohga, A. Takaue, T. Shigematsu and T. Hara(Japan)

 
Abstract     [Buy Article]
    The effects of the initial imperfections on the nonlinear behaviors and ultimate strength of
the thin-walled members subjected to the axial loads, obtained by the finite element stability analysis, are
examined. As the initial imperfections, the buckling mode shapes of the members are adopted. The
buckling mode shapes of the thin-walled members are obtained by the transfer matrix method. In the
finite element stability analysis, isoparametric degenerated shell element is used, and the geometrical and
material nonlinearity are considered based on the Green Lagrange strain definition and the Prandtl-Reuss
stress-strain relation following the von Mises yield criterion. The U-, box- and I-section members
subjected to the axial loads are adopted for numerical examples, and the effects of the initial
imperfections on the nonlinear behaviors and ultimate strength of the members are examined.
 
Key Words
    finite element stability analysis; initial imperfection; nonlinear behavior; thin-walled member; ultimate strength.
 
Address
M. Ohga, Department of Civil and Environmental Engineering, Ehime University, Matsuyama 790-8577, Japan
A. Takaue, Chodai Ltd., Takamatsu 760-0017, Japan
T. Shi gematsu and T. Hara, Tokuyama Technical College, Tokuyama 745-8585, Japan
 

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