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Residual capacity of cold-formed steel rack uprights following stomping during rocking

Journal Article


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Abstract


  • When selective pallet racks are allowed to rock in the cross-aisle direction during an earthquake, the uprights are subjected to short duration high axial forces at stomping. In this paper, the amplitude of the stomping force needed to compromise the upright's residual capacity is assessed for 59 configurations using nonlinear inelastic static and dynamic analyses. Parametric studies are performed to investigate the effects of upright length, bracing pitch, section slenderness, torsional restraints and multiple impulses on the residual capacity of an upright due to rocking. Uprights that fail in the flexural-torsional buckling mode perform better than those that fail by local-distortional buckling as the stomping causes permanent local-distortional deformations rather than sweep (torsional deformation). A rack upright that has a greater length, greater thickness and lower torsional restraint tends to have a higher residual capacity (relative to the undamaged capacity). A typical cold-formed steel rack upright can sustain a 0.1 s stomping force that is at least 15% greater than its static ultimate capacity without significant reduction in residual capacity. An implication is that an unanchored upright that survives an earthquake through rocking may double its storage load during the post-earthquake emergency period. The present shell element analysis results can be used to plan an experimental program for optimising the resilience of storage rack uprights against stomping.

Authors


  •   Maguire, James (external author)
  •   Teh, Lip H.
  •   Clifton, G Charles. (external author)
  •   Lim, James (external author)

Publication Date


  • 2019

Citation


  • Maguire, J. R., Teh, L. H., Clifton, G. Charles. & Lim, J. B. P. (2019). Residual capacity of cold-formed steel rack uprights following stomping during rocking. Journal of Constructional Steel Research, 159 189-197.

Scopus Eid


  • 2-s2.0-85065090648

Ro Full-text Url


  • https://ro.uow.edu.au/context/eispapers1/article/3693/type/native/viewcontent

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/2684

Number Of Pages


  • 8

Start Page


  • 189

End Page


  • 197

Volume


  • 159

Place Of Publication


  • United Kingdom

Abstract


  • When selective pallet racks are allowed to rock in the cross-aisle direction during an earthquake, the uprights are subjected to short duration high axial forces at stomping. In this paper, the amplitude of the stomping force needed to compromise the upright's residual capacity is assessed for 59 configurations using nonlinear inelastic static and dynamic analyses. Parametric studies are performed to investigate the effects of upright length, bracing pitch, section slenderness, torsional restraints and multiple impulses on the residual capacity of an upright due to rocking. Uprights that fail in the flexural-torsional buckling mode perform better than those that fail by local-distortional buckling as the stomping causes permanent local-distortional deformations rather than sweep (torsional deformation). A rack upright that has a greater length, greater thickness and lower torsional restraint tends to have a higher residual capacity (relative to the undamaged capacity). A typical cold-formed steel rack upright can sustain a 0.1 s stomping force that is at least 15% greater than its static ultimate capacity without significant reduction in residual capacity. An implication is that an unanchored upright that survives an earthquake through rocking may double its storage load during the post-earthquake emergency period. The present shell element analysis results can be used to plan an experimental program for optimising the resilience of storage rack uprights against stomping.

Authors


  •   Maguire, James (external author)
  •   Teh, Lip H.
  •   Clifton, G Charles. (external author)
  •   Lim, James (external author)

Publication Date


  • 2019

Citation


  • Maguire, J. R., Teh, L. H., Clifton, G. Charles. & Lim, J. B. P. (2019). Residual capacity of cold-formed steel rack uprights following stomping during rocking. Journal of Constructional Steel Research, 159 189-197.

Scopus Eid


  • 2-s2.0-85065090648

Ro Full-text Url


  • https://ro.uow.edu.au/context/eispapers1/article/3693/type/native/viewcontent

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/2684

Number Of Pages


  • 8

Start Page


  • 189

End Page


  • 197

Volume


  • 159

Place Of Publication


  • United Kingdom