full scale tests; fire tests; cellular beams; steel; frames; buildings; floors; composite construction; slab
Abstract :
[en] As part of an international major research initiative, dealing with the behaviour of long span cellular beams in steel framed buildings under fire, a large-scale fire test incorporating 15m long cellular beams was carried out. The test incorporated unprotected secondary cellular steel beams acting compositely with the supporting floor slab. The floorplate in its entirety was designed to carry the load with unprotected beams, when subjected to a severe fire, by utilising membrane action of the floor slab. The overall structure performed very well supporting the full applied static load for the duration of the test. The unprotected cellular steel beams were subjected to distortional buckling, with only the
top tee providing any support through catanary action. The test supported the assumptions adopted in the structural design approach and provided an accurate estimate of the strength of the floorplate. Comparison of the recorded time-temperature relationship of the fire with the design method presented in the Eurocodes shows that the code under-predicts the severity of the fire, although this was compensated to some extent by the conservative assumptions embedded within the structural model.
Disciplines :
Civil engineering
Author, co-author :
Nadjai, Ali; University of Ulster
Bailey, Colin; University of Manchester
Vassart, Olivier; ArcelorMittal
Han, S; University of Ulster
Zhao, Bin; C.T.I.C.M.
Hawes, Mike; ASDWestok
Franssen, Jean-Marc ; Université de Liège - ULiège > Département Argenco : Secteur SE > Ingénierie du feu
Simms, Ian; Steel Construction Institute
Language :
English
Title :
Full-scale fire test on a composite floor slab incorporating long span cellular steel beams
Publication date :
01 November 2011
Journal title :
Structural Engineer
ISSN :
1466-5123
Publisher :
The Institution of Structural Engineers, London, United Kingdom
Volume :
89
Issue :
21
Pages :
18-25
Peer reviewed :
Peer reviewed
Name of the research project :
FICEB
Funders :
RFCS - European Commission. Research Fund for Coal and Steel
Knowles, P. R.: 'Castellated beams', ICE Proc., 90/3, p 521-536, 1991 (Pubitemid 21695191)
Dougherty, B. K.: 'Castellated beams: a state of the art report. Technical report', J. South African Institution of Civil Engineers, 35/2, p12-20, 1993
Zaarour, W., Redwood, R. G.: 'Web buckling in thin webbed castellated beams', J. Struct. Eng., ASCE, 8, p 860-866,1996 (Pubitemid 126591477)
Vassar, O., Nadjai, A.: 'Analytical model for the web post buckling in cellular beams under fire', 5th Int. Conf. Structures in fire, p 3-11, May 2008
Nadjai, A., Goodfellow, N., Ali, F.: 'Simple calculation method of composite cellular beams at elevated temperatures', 5th Int. Conf. Structures in fire, p 551-559, May 2008
Nadjai, A., Olivier, V., Ali, F.: Ahmed Allam: 'Performance of cellular composite floor beams at elevated temperatures', Fire Safety J., 42, p 489-497, Sept. 2007 (Pubitemid 47385954)
Nadjai, A., Bailey, C. G., Ali, F.: 'Experimental and numerical investigation on composite floor cellular steel beams in fire'. Steel and Composite Structures, p 673-686, Manchester, August, 2007
Bailey, C.: 'Indicative fire tests to investigate the behaviour of cellular beams protected with intumescent coatings'. Fire Safety J., 39 (2004) p 689-709
Bailey, C. G., Lennon, T., and Moore, D. B.: 'The behaviour of full-scale steel-framed buildings subjected to compartment fires', The Structural Engineer, 77/8 April 1999, p 15-21
O'Conner, M. A, Kirby, B. R and Martin, D. M.: 'Behaviour of a multi-storey composite steel framed building in fire'. The Structural Engineer, 10/2 January 2003, p 27-36
Bailey, C. G. and Moore, D. B.: 'The structural behaviour of steel frames with composite floorslabs subject to fire: Part 1: Theory'. The Structural Engineer, 78/11 June 2000, p 19 - 27
Bailey, C. G. and Moore, D. B.: 'The structural behaviour of steel frames with composite floorslabs subject to fire: Part 2: Design'. The Structural Engineer, 78/11 June 2000, p 28 - 33
Bailey, C. G.: 'Membrane action of unrestrained lightly reinforced concrete slabs at large displacements', Engineering Structures, 23, p 470-483, 2001
Bailey, C. G., Toh, W..S.: 'Behaviour of concrete floor slabs at ambient and elevated temperatures'. Fire Safety J., 42/ 6-7, 2007 p 425-436 (Pubitemid 47380155)
Newman, G. M., Robinson, J. T. and Bailey, C. G.: Fire Safe Design: A New Approach to Multi-Storey Steel-Framed Buildings (Second Edition). SCI Publication P288, The Steel Construction Institute, Ascot, 2006, ISBN 1 85942 169 5
Bailey, C. G.: 'Steel structures supporting composite floor slabs: design for fire'. BRE Digest 462, December 2001. ISBN 1 86081 527 8
Advanced Structural Fire Engineering, The Institution of Structural Engineers. August 2007, ISBN 978-0-901297-46-4
BS 5950-1:2000: Structural use of steelwork in building. Code of practice for design. Rolled and welded sections. British Standards Institution, London, 2000. (Withdrawn 30 March 2010, replaced by BS EN 1993-1-1:2005)
BS 5950-3.1:1990+A1:2010: Structural use of steelwork in building. Design in composite construction. Code of practice for design of simple and continuous composite beams. BSI, London, 2010. (Withdrawn 30 April 2010, replaced by BS EN 1994-1-1:2004)
SCI P300, Composite slabs and beams using decking; Best practice for design and construction, 2000
SCI Advisory Desk, AD 325: Curtailment of transverse bar reinforcement in composite beams with steel decking, 2008
NA to BS EN 1990:2002 + A1:2005; UK National Annex for Eurocode Basis of structural design. British Standards Institution, London, 2005
BS EN1991-1-2: 2002 Actions on structures. Actions on structures - Part 1.2: General actions - Actions on structures exposed to fire. British Standards Institution, London, 2002
NA to BS EN 1991-1-2: 2002: UK National Annex to Eurocode 1: Actions on structures - Part 1.2: General actions - Actions on structures exposed to fire, British Standards Institution, London, 2007
BS 7974-1: Application of fire safety engineering principles to the design of buildings-Part 1: Initiation and development of fire within the enclosure of origin (Sub-system 1). Code of practice. British Standards Institution, London, 2003
Cadorin, J-F., Pintea, D.., Dotreppe, J-C. and Franseen, J-M.: 'A tool to design steel elements submitted to compartment fires - OZone V2. Part 2: Methodology and application'. Fire Safety J., 38/6, p 429-451
BS EN1994-1-2. Eurocode 4.Design of composite steel and concrete structures. Part 1.2. General rules. Structural fire design. British Standards Institution, London, 2005
Bailey, C. G., Toh, W. S.: 'Small-scale concrete slab tests at ambient and elevated temperatures'. Eng. Struct., 29, 2007, p 2775-2791 (Pubitemid 47333633)
