Advanced Steel Construction

Vol. 3, No. 1, pp. 512-529(2007)



M. Maślak

Assistant Professor, Department of Civil Engineering,

Cracow University of Technology, 31-155 Cracow, Warszawska 24, Poland

(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it. )

Received: 7 September 2006; Revised: 21 October 2006; Accepted: 25 October 2006




View Article   Export Citation: Plain Text | RIS | Endnote


The approach, presented in this paper, allows a designer to assess the value of steel member fire resistance if unlimited thermal deformations are restrained. The beam analysed in the example is subject to bending in persistent design situation; whereas, under the influence of fire temperature, additional compression force occurs. The fire resistance of structural element depends on the degree of restraints. Large flexural stiffness of columns which bound the beam leads to the relatively small value of beam fire resistance. Alternatively, if their stiffness is lower (deformability is greater) the reduction of member fire resistance in relation to the beam with fully unrestrained thermal deformations is also softer. Results obtained in the presented analysis should be interpreted only as an approximation of real values. More accurate solutions can be reckoned only if rheological effects, particularly creep of steel, are taken into account.



beam-column; fire; temperature; fire resistance; thermal deformation


[1]    Allam, A.M., Burgess, I.W. and Plank, R.J., “Performance-based Simplified Model for a Steel Beam at Large Deflection in Fire”, Proceedings of 4th International Conference “Performance-based Codes and Fire Safety Design Methods”, 2002, Melbourne, Australia.

[2]   Boissonnade, N., Jaspart, J-P., Muzeau, J-P. and Vilette, M., “New Interaction Formulae for Beam-columns in Eurocode 3: The French-Belgian Approach”, Proceedings of 3rd European Conference on Steel Structures “Eurosteel 2002”, September 19-20 2002, Coimbra, Portugal.

[3]   Cai, J., Burgess, I.W. and Plank, R.J., “The Effect of Push-out of Perimeter Building Columns of Their Survival in Fire”, Proceedings of International Conference “Steel Structures of the 2000’s, 2002, Istanbul, Turkey.

[4]   Huang, Z., Burgess, I.W. and Plank, R.J., “3D Modelling of Beam-columns with General Cross-sections in Fire”, Proceedings of 3rd International Workshop “Structures in Fire”, 2004, Ottawa, Canada.

[5]   Liu, T.C.H., Fahad, M.K. and Davies, J.M., “Experimental Investigation of Behaviour of Axially Restrained Steel Beams in Fire”, Journal of Constructional Steel Research, 2002, Vol. 58.

[6]   Lopes, N., Simões da Silva, L., Vila Real, P.M.M. and Piloto, P., “New Proposals for the Design of Steel Beam-columns in Case of Fire Including a New Approach for the Lateral-torsional Buckling, Computer and Structures, 2004, Vol. 82.

[7]   Maślak, M., “Fire Resistance of Steel Beam-columns”, Proceedings of 11th International Conference on Metal Structures “Progress in Steel, Composite and Aluminium Structures, 2006, Rzeszów, Poland.

[8]   Murzewski, J., “Columns and Beam-columns”, Proceedings of 2nd Regional Colloquium of Steel Structures, 1986, Budapest, Hungary.

[9]   Murzewski, J., Gwóźdź, M., “Resistance of Steel Columns in Fire Temperatures”, Proceedings of 37th Scientific Conference, 1991, Krynica, Poland, Vol. 4.

[10]  Muzeau, J-P., “Reliability of Steel Columns. Study of the Polish Standard Code”, Proceedings of 34th Scientific Conference, 1988, Krynica, Poland, Vol. 3.

[11]  Valente, J.C., “Fire Resistance of Steel Columns with Elastically Restrained Axial Elongation and Bending”, Journal of Constructional Steel Research, 1999, Vol. 52.

[12]  Vila Real, P.M.M., Lopes, N., Simões da Silva, L., Piloto, P. and Franssen, J-M., “Towards a Consistant Safety Format of Steel Beam-columns: Application of the New Interaction Formulae for Ambient Temperature to Elevated Temperatures”, Steel & Composite Structures, 2003, Vol. 3, No. 6. [13] Vila Real, P.M.M., Lopes, N., Simões da Silva, L., Piloto, P. and Franssen, J-M., “Numerical Modelling of Steel Beam-columns in Case of Fire – Comparison with Eurocode 3, Fire Safety Journal, 2004, Vol. 39.

[14]  Yin, Y.Z. and Wang, Y.C., “A Numerical Study of Large Deflection Behaviour of Restrained Steel Beams at Elevated Temperatures”, Journal of Constructional Steel Research, 2004, Vol. 60.

[15]  DIN 18800, Stahlbauten, Bemessung und Konstruktion, Part 1 & 2.

[16]  EN 1993-1-2, Eurocode 3: Design of Steel Structures, Part 1-2: General Rules – Structural Fire Design.

[17]  PN-90/B-03200, Steel Structures, Design rules