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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 |
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Effects of initial imperfections on nonlinear behaviors of thin-walled members |
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M. Ohga, A. Takaue, T. Shigematsu and T. Hara(Japan)
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| Abstract | ||
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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 | ||