Unified Approach to Local Stability of Plate/Stiffener Assemblies
Publication: Journal of Engineering Mechanics
Volume 121, Issue 2
Abstract
A semianalytical approach for the computation of the local buckling of stiffened plates under any combination of applied biaxial compression, in-plane bending, and shear stress is presented. The plate is treated as partially restrained against rotation and in-plane translation. In the first stage, the plate is treated as infinitely long and the buckling mode is idealized by straight lines with arbitrary parameters. The energy method is then used to formulate the buckling coefficient, K, in terms of general functions that describe the longitudinal and transverse displacement profiles. In the second stage, sequential quadratic programming (SQP) is used to find the critical combinations of the parameters in the idealized buckling mode that minimize the coefficient, K . Modification factors are then suggested to compute the buckling stress for plates of finite length. Using the derived formulations, a closed-form expression for the K factor is determined by choosing approximate displacement functions. Validation, accuracy, and comparison of the derived K factor is shown for the limiting conditions of simply supported and clamped edges. Finally, results are presented for the more general case of a plate partially restrained against rotation. The transition from rotationally free to rotationally clamped boundaries is shown by modifying the stiffener torsional rigidities. The destabilizing effect of the lateral restraint on the buckling stress is also shown.
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Published In
Journal of Engineering Mechanics
Volume 121 • Issue 2 • February 1995
Pages: 214 - 229
Copyright
Copyright © 1995 American Society of Civil Engineers.
History
Published online: Feb 1, 1995
Published in print: Feb 1995
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