Effect of reduced joint strength and semi-rigid joints on cold-formed steel portal frames

Colin Jackson, Andrzej Wrzesien, Ross P. Johnston, Asraf Uzzaman, James Lim

Research output: Contribution to conferencePaper

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Abstract

This paper considers the effect of semi-rigid joints and finite connection length on the design of cold-formed steel portal frames sized using a rigid joint and full joint strength assumption, and whether it can offset the fact that the joints cannot sustain the full moment capacity of the sections. The paper shows that for frames of modest span (around 10 m), sized using a rigid joint and full joint strength assumption, that the frames are unsafe under gravity load and do not satisfy the ultimate limit state. Designers should therefore take the semi-rigidity and partial strength of the joints when analysing such frames, particularly when stressed skin action is also used in the design.
Original languageEnglish
Number of pages8
Publication statusPublished - 3 Dec 2012
Event6th International Conference on Coupled Instabilities in Metal Structures, CIMS 2012 - Glasgow, United Kingdom
Duration: 3 Dec 20125 Dec 2012

Conference

Conference6th International Conference on Coupled Instabilities in Metal Structures, CIMS 2012
CountryUnited Kingdom
CityGlasgow
Period3/12/125/12/12

Fingerprint

Steel
Rigidity
Skin
Gravitation

Keywords

  • joint strength
  • cold-formed steel
  • portal frames
  • finite element analysis

Cite this

Jackson, C., Wrzesien, A., Johnston, R. P., Uzzaman, A., & Lim, J. (2012). Effect of reduced joint strength and semi-rigid joints on cold-formed steel portal frames. Paper presented at 6th International Conference on Coupled Instabilities in Metal Structures, CIMS 2012, Glasgow, United Kingdom.
Jackson, Colin ; Wrzesien, Andrzej ; Johnston, Ross P. ; Uzzaman, Asraf ; Lim, James. / Effect of reduced joint strength and semi-rigid joints on cold-formed steel portal frames. Paper presented at 6th International Conference on Coupled Instabilities in Metal Structures, CIMS 2012, Glasgow, United Kingdom.8 p.
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Jackson, C, Wrzesien, A, Johnston, RP, Uzzaman, A & Lim, J 2012, 'Effect of reduced joint strength and semi-rigid joints on cold-formed steel portal frames' Paper presented at 6th International Conference on Coupled Instabilities in Metal Structures, CIMS 2012, Glasgow, United Kingdom, 3/12/12 - 5/12/12, .

Effect of reduced joint strength and semi-rigid joints on cold-formed steel portal frames. / Jackson, Colin ; Wrzesien, Andrzej; Johnston, Ross P.; Uzzaman, Asraf; Lim, James.

2012. Paper presented at 6th International Conference on Coupled Instabilities in Metal Structures, CIMS 2012, Glasgow, United Kingdom.

Research output: Contribution to conferencePaper

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T1 - Effect of reduced joint strength and semi-rigid joints on cold-formed steel portal frames

AU - Jackson, Colin

AU - Wrzesien, Andrzej

AU - Johnston, Ross P.

AU - Uzzaman, Asraf

AU - Lim, James

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AB - This paper considers the effect of semi-rigid joints and finite connection length on the design of cold-formed steel portal frames sized using a rigid joint and full joint strength assumption, and whether it can offset the fact that the joints cannot sustain the full moment capacity of the sections. The paper shows that for frames of modest span (around 10 m), sized using a rigid joint and full joint strength assumption, that the frames are unsafe under gravity load and do not satisfy the ultimate limit state. Designers should therefore take the semi-rigidity and partial strength of the joints when analysing such frames, particularly when stressed skin action is also used in the design.

KW - joint strength

KW - cold-formed steel

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KW - finite element analysis

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Jackson C, Wrzesien A, Johnston RP, Uzzaman A, Lim J. Effect of reduced joint strength and semi-rigid joints on cold-formed steel portal frames. 2012. Paper presented at 6th International Conference on Coupled Instabilities in Metal Structures, CIMS 2012, Glasgow, United Kingdom.