An analysis of the effect of holes patterns on coupled instability of perforated thin-walled members

Authors

  • Mihai Nedelcu

Keywords:

rack columns, perforated thin-walled member, interactive buckling, mode decomposition, shell finite element analysis, generalised beam theory

Abstract

The buckling behaviour of vertical steel pallet rack columns is greatly influenced by the distribution of perforations punched continuously along their length. To study the influence of the holes patterns on the elastic coupled instabilities of thinwalled members, this paper uses an original modal identification method (based on the Generalised Beam Theory) which is able to provide the pure buckling modes participation (of global, distortional, local nature) in a general eigenvalue buckling mode given by the shell Finite Element Analysis.

References

SCHARDT, R., Verallgemeinerte Technische Biegetheorie (in German), Springer-Verlag, Berlin, 1989.

SCHARDT, R., Generalized beam theory – an adequate method for coupled stability problems, Journal of Thin-Walled Structures, 19, pp. 161-180, 1994.

ÁDÁNY, S., SCHAFER, W. B., A full modal decomposition of thin-walled, single branched open cross-section members via the constrained finite strip method, Journal of Constructional Steel Research, 64, pp. 12–29, 2008.

BASAGLIA, C., CAMOTIM, D., SILVESTRE, N., Non-linear GBT formulation for open-section thin-walled members with arbitrary support conditions. Journal of Computers and Structures, 89, 21–22, pp. 1906–1919, 2011.

LI, Z., SCHAFER, B.W., Buckling analysis of cold-formed steel members with general boundary conditions using CUFSM: Conventional and constrained finite strip methods, 20th International Specialty Conference on Cold-Formed Steel Structures – Recent Research and Developments in Cold-Formed Steel Design and Construction, 2010.

BEBIANO, R., PINA, P., SILVESTRE N. and CAMOTIM, D. , GBTUL – Buckling and Vibration Analysis of Thin-Walled Members, DECivil/IST, Technical University of Lisbon (http://www. civil.ist.utl.pt/gbt), 2008.

*** Elastic Buckling Analysis of Thin-Walled Members by Finite Strip Analysis, CUFSM (http://www.ce.jhu.edu/bschafer/cufsm/).

DAVIES, J. M., LEACH, P., TAYLOR, A., The design of perforated cold-formed steel sections subject to axial load and bending, Journal of Thin-Walled Structures, 29, pp. 141–157, 1997.

MOEN, C., SCHAFER, W. B., Direct strength method for design of cold-formed steel columns with holes, Journal of Structural Engineering, 137, 5, pp. 559–570, 2011.

NEDELCU, M., GBT-based buckling mode decomposition from finite element analysis of thinwalled members, Journal of Thin-Walled Structures, 54, pp. 156–163, 2012.

BEBIANO, R., SILVESTRE, N., CAMOTIM, D., GBT formulation to analyze the buckling behaviour of thin-walled members subjected to non-uniform bending, Journal of Structural Stability and Dynamics, 7, 1, pp. 23–54, 2007.

Published

2014-02-15