On the redistribution of bending moments in two-span RC beams and slabs exposed to fire

Robert Kowalski , Marek Urbański


This paper shows consideration of decrease in cross-section stiffness in commonly used in practice RC (reinforced concrete) beams and slabs in cases when only reinforcing bars or only concrete compressed zone, which is subjected to fire. Analyses were based on: (1) standard fire curve [EN 1991-1-2]; (2) 500 oC isotherm method assumptions [EN 1992-1-2]; (3) mechanical properties of reinforcing steel heated up to high temperature. Afterwards, based on estimated decrease of cross-sections stiffness, the redistribution of bending moments was calculated in some cases of two-span RC beams and slabs subjected to fire from their bottom face. Due to the bending moment redistribution, one could expect a reduction of bending moments in span cross-sections and an increase of support bending moment. As a result of this phenomenon, the ultimate limit state of the structural multi span elements might occur after shorter fire duration than it could be expected when redistribution of bending moments is neglected.
Author Robert Kowalski (FCE / ICE)
Robert Kowalski,,
- The Institute of Civil Engineering
, Marek Urbański (FCE / ICE)
Marek Urbański,,
- The Institute of Civil Engineering
Journal seriesJournal of Civil Engineering and Architecture, ISSN 1934-7359
Issue year2013
Publication size in sheets0.75
Keywords in Englishconcrete, cross-section, fire design, stiffness
Languageen angielski
Score (nominal)7
Score sourcejournalList
ScoreMinisterial score = 7.0, 22-12-2019, ArticleFromJournal
Ministerial score (2013-2016) = 7.0, 22-12-2019, ArticleFromJournal
Publication indicators GS Citations = 3.0
Citation count*3 (2020-09-06)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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