Plastic behaviour of strengthened cold-formed steel section

To date, the use of cold-formed steel on single storey industrial buildings particularly as structural element of a portal frame is restricted. Mostly, its application is as roof and wall framing, cladding, purlins and rails. Compared with hot-rolled steel, the use of cold-formed steel on a building...

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Main Author:	Setiyawan, Prabowo
Format:	Thesis
Language:	English
Published:	2012
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/32434/5/PrabowoSetiyawanPFKA2012.pdf
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id	my-utm-ep.32434
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spelling	my-utm-ep.324342018-04-27T01:21:53Z Plastic behaviour of strengthened cold-formed steel section 2012-03 Setiyawan, Prabowo TA Engineering (General). Civil engineering (General) To date, the use of cold-formed steel on single storey industrial buildings particularly as structural element of a portal frame is restricted. Mostly, its application is as roof and wall framing, cladding, purlins and rails. Compared with hot-rolled steel, the use of cold-formed steel on a building has advantages such as light self-weight and corrosion-free problems, even though these are weaknesses to be overcome. The main problems are local buckling and low connection capacity. From the previous study, it was shown that cod-formed rectangular hollow portal frame using thick section indicated the plastic behaviour. This section is uneasy to be derived at site. Besides, some connection methods have also been suggested by previous researchers using bolts, rivets, press and weld but such the connections cannot reach rigid connection as needed for plastic design of portal frame. This research intends to study strengthening methods of cold-formed steel section and the connection performance improvement using cover plate. From this study, it is expected that cold-formed steel section can achieve plastic section and the rigid connection can be reached. The study was performed in two stages. In the first stage, the study on small cold-formed steel beams was done, while in the second stage, the study investigated a full scale of cold-formed steel beams and the connections. Specimens of this research consist of strengthened cold-formed closed beams and the moment connections. The beams are strengthened using a splice of hot rolled plate attached to the original section by screws and weld. The beams are in various design strength, thickness, screw spacing and number of web screw rows. Three types of connection i.e. welded, unbraced cover and braced cover connections were constructed for the specimens. Self-drilling screws for the section strengthening were applied on the connected members outside the cover plate. The experimental results were compared to the theoretical one. From this study, it can be concluded that the applied strengthening method significantly increase the moment capacity of the cold-formed steel sections. Similarly, the braced cover connection improves the connection to be rigid connection. 2012-03 Thesis http://eprints.utm.my/id/eprint/32434/ http://eprints.utm.my/id/eprint/32434/5/PrabowoSetiyawanPFKA2012.pdf application/pdf en public phd doctoral Universiti Teknologi Malaysia, Faculty of Civil Engineering Faculty of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Setiyawan, Prabowo Plastic behaviour of strengthened cold-formed steel section
description	To date, the use of cold-formed steel on single storey industrial buildings particularly as structural element of a portal frame is restricted. Mostly, its application is as roof and wall framing, cladding, purlins and rails. Compared with hot-rolled steel, the use of cold-formed steel on a building has advantages such as light self-weight and corrosion-free problems, even though these are weaknesses to be overcome. The main problems are local buckling and low connection capacity. From the previous study, it was shown that cod-formed rectangular hollow portal frame using thick section indicated the plastic behaviour. This section is uneasy to be derived at site. Besides, some connection methods have also been suggested by previous researchers using bolts, rivets, press and weld but such the connections cannot reach rigid connection as needed for plastic design of portal frame. This research intends to study strengthening methods of cold-formed steel section and the connection performance improvement using cover plate. From this study, it is expected that cold-formed steel section can achieve plastic section and the rigid connection can be reached. The study was performed in two stages. In the first stage, the study on small cold-formed steel beams was done, while in the second stage, the study investigated a full scale of cold-formed steel beams and the connections. Specimens of this research consist of strengthened cold-formed closed beams and the moment connections. The beams are strengthened using a splice of hot rolled plate attached to the original section by screws and weld. The beams are in various design strength, thickness, screw spacing and number of web screw rows. Three types of connection i.e. welded, unbraced cover and braced cover connections were constructed for the specimens. Self-drilling screws for the section strengthening were applied on the connected members outside the cover plate. The experimental results were compared to the theoretical one. From this study, it can be concluded that the applied strengthening method significantly increase the moment capacity of the cold-formed steel sections. Similarly, the braced cover connection improves the connection to be rigid connection.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Setiyawan, Prabowo
author_facet	Setiyawan, Prabowo
author_sort	Setiyawan, Prabowo
title	Plastic behaviour of strengthened cold-formed steel section
title_short	Plastic behaviour of strengthened cold-formed steel section
title_full	Plastic behaviour of strengthened cold-formed steel section
title_fullStr	Plastic behaviour of strengthened cold-formed steel section
title_full_unstemmed	Plastic behaviour of strengthened cold-formed steel section
title_sort	plastic behaviour of strengthened cold-formed steel section
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2012
url	http://eprints.utm.my/id/eprint/32434/5/PrabowoSetiyawanPFKA2012.pdf
_version_	1747816001583448064

Plastic behaviour of strengthened cold-formed steel section

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