Development of a light-weight composite lattice joist for fire resistance

R Burns, S Choi, D Hanley, I Burgess, N Butterworth

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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Abstract

This paper describes development studies on a new composite lattice joist floor
framing system, particularly on the performance-based approach taken to fire resistance. This has involved collaboration between the manufacturer, a consulting engineer and university researchers. The light-weight open-web floor joist is fire-protected offsite using intumescent paint, to achieve a one-hour fire rating. It is a competitive light-weight option for long-span floor construction, which allows ducting to pass through the voids in the lattice. It eliminates
the need for through-deck welding on site due to the presence of pre-welded shear connectors in the top chord. The main objective was to develop a cost-effective method of achieving one-hour fire resistance using a single coat of intumescent paint. This system is common in hot -rolled steel construction, but has not usually been associated with light-weight coldformed sections. The system has been analysed using the specialized software Vulcan. The prototype design was based on 750mm deep Warren joists of 15m span, spaced 2.5m apart,
with a composite concrete slab on profiled steel decking. A BS476 loaded fire test was carried out at the Warrington Fire Research Centre which verified the software approach. Recent modelling has focused on developing a series of such joists to be used over a range of spans.
Original languageEnglish
Title of host publicationProceedings [of The] Nordic Steel Construction Conference 2009
Number of pages8
Publication statusPublished (in print/issue) - 2009
EventNordic Steel Construction Conference 2009 - Malmö, Sweden
Duration: 2 Sept 20094 Sept 2009

Conference

ConferenceNordic Steel Construction Conference 2009
Country/TerritorySweden
CityMalmö
Period2/09/094/09/09

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