Recent Developments in Computational Mechanics, AD-Vol.39 (Eds. P.K.Basu, A.Nagar),
pp. 83-92, 1993


THE EFFECTIVE WIDTH FOR
POSTCRITICALLY LOADED STIFFENED PANELS

X. Wang and F.G. Rammerstorfer

Institute of Lightweight Structures and Aerospace Engineering,
TU Wien, Vienna, Austria


Abstract - The effective width concept is a proper and often used method for engineering estimates of the postbuckling behavior of stiffened plates. For plate configurations which show local buckling before global buckling, this concept allows the calculation of the interaction of this local buckling with the subsequent global one or with other kinds of postbuckling failure. Several formulae (most of them empirically derived) exist for an approximative calculation of the load dependent value of the effective width. It is the aim of this paper to present a numerical approach for calculating this important desing parameter by using a nonlinear finite strip method. This method also allows the computation of the elastic postbuckling behavior up to complete collapse.
Comparisons between numerical results derived for different configurations of stiffened plates and classical estimates are presented with respect to the effective width as well as its use for estimating subsequent global buckling or onset of yielding.


(hjb,960709)