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EVALUATING DESIGN GUIDANCE FOR INTUMESCENT FIRE PROTECTION OF CONCRETE FILLED STEEL HOLLOW SECTIONS

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Original languageEnglish
Title of host publication8th International Conference on Structures in Fire
Place of PublicationShanghai
PublisherTongji University Press
Pages1071-1078
Volume2
ISBN (Print)978-7-5608-594-6
Publication statusPublished - 1 Jun 2014

Abstract

Design of intumescent protection systems for concrete filled structural steel hollow (CFS) sections in the UK typically requires three input parameters: (1) a required fire resistance rating; (2) an ‘effective’ section factor; and (3) a limiting steel temperature for the hollow section. While the first of these is generally prescribed in building codes, the latter two require engineering judgement. This paper examines results from furnace tests on 21 CFS sections, 12 of which were protected with intumescent coatings by applying current UK design guidance. The protected sections demonstrate highly conservative fire protection under standard fire exposure; this is not typically observed for protected unfilled steel sections. Possible causes of the observed conservatism are discussed. It is demonstrated that the assumptions used in design guidance to calculate the effective section factor for protected CFS columns are physically unrealistic and inaccurate. Interim design guidance is given.

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