Local Web Crippling of Unstiffened Multi-Cell Box Sections

by Mark R. Kaczinski, (M.ASCE), Lehigh Univ, Bethlehem, United States,
Christopher R. Schneider, Lehigh Univ, Bethlehem, United States,
Robert J. Dexter, (A.M.ASCE), Lehigh Univ, Bethlehem, United States,
Le-Wu Lu, (M.ASCE), Lehigh Univ, Bethlehem, United States,

Document Type: Proceeding Paper

Part of: Structures Congress XII


Full-scale experiments and analyses show that the AISC/LRFD design equations for web yielding and web crippling strength of unstiffened webs, developed from test data on I sections, can be applied to multi-cell box sections. Compressive patch loads of various lengths were applied in displacement control to single webs and simultaneously over two adjacent webs. The full range of behavior from web yielding, to web crippling, to overall shear buckling was obtained from the experiments. Large-displacement elastoplastic finite-element analyses were performed to simulate several of the experiments. Reasonable estimates of the load-deflection curve were obtained using shell elements larger than 50 mm square if the initial out-of-flatness was input to the analysis. One test which resulted in overall shear buckling did not reach the design strength given by the AISC/LRFD shear buckling equation.

Subject Headings: Buckling | Finite element method | Load tests | Internet | Compression tests | Webs (structure) | Structural design

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