lateral-torsional buckling; fire; numerical modeling; new proposal; eurocode 3; ISO 834
Abstract :
[en] A geometrically and materially non-linear finite element program, i.e., a general model, has been used to determine the lateral-torsional resistance of steel I-beams under fire conditions, according to the same material properties of Eurocode 3, Part 1-2. Two yield strengths, one cross section, one type of load and four different time exposures to the ISO 834 standard fire have been considered. The numerical results have been compared to the results of the simple model presented in Eurocode 3, Part 1-2. When compared with the general model, this simple model leads to a safety level that depends on the slenderness of the beam, being unsafe for intermediate non-dimensional slenderness. A new proposal has been made for a simple model that ensures a conservative result when compared to the general model.
Disciplines :
Materials science & engineering
Author, co-author :
Vila Real, Paulo M. M.; University of Aveiro
Franssen, Jean-Marc ; Université de Liège - ULiège > Département Argenco : Secteur SE > Ingénierie du feu
Language :
English
Title :
Numerical modelling of lateral-torsional buckling of steel I-beams under fire conditions - Comparison with Eurocode 3
(1989) Eurocode 3, design of steel structures, Part 1, general rules and rules for buildings, background documentation. Evolution of Test Results on Beams with Cross-Sectional Classes 1-3 in Order to Obtain Strength Functions and Suitable Model Factors, Cap. 5 Document 5.03, October; .
Bailey C.G., Burgess I.W., Plank R.J. (1996) The lateral-torsional buckling of unrestrained steel beams in fire. Journal Construct. Steel Research 36:101-119.
Franssen J.-M. PROGRAM SAFIR, Ver 1.3, User's Manual, Universite de Liege, Institut du Genie Civil, Service Ponts et Charpentes, December; 1996.
Vila Real P.M.M., Franssen J.-M. Lateral Buckling of Steel I Beams at Room Temperature - Comparison between the Eurocode 3 and the SAFIR Code Considering or Not the Residual Stresses, Internal Report No. 99/01, Institute of Civil Engineering, Service Ponts et Charpentes, University of Liege, January; 1999.
Eurocode 3, Design of Steel Structures, Part 1-1, General Rules and Rules for Buildings, Draft ENV 1993-1-1, Commission of the European Communities, Brussels, Belgium; 1992.
Eurocode 3 Design of Steel Structures Part 1-2 General Rules and Rules for Buildings Structural Fire Design, Draft ENV 1993-1-2, Commission of the European Communities, Brussels, Belgium; 1995.
Franssen J.M. (1989) Modelling of the Residual Stresses Influence in the Behaviour of Hot-Rolled Profiles under Fire Conditions. Construction Métallique , in French; 3:35-42.
Franssen J.M. (1990) The unloading of building materials submitted to fire. Fire Safety Journal 16:213-227.
Talamona D., Franssen J.M., Schleich J.B., Kruppa J. (1997) Stability of steel columns in case of fire: Numerical modelling. Journal of Structural Engineering , Jun.; 123(6):713-720.
Franssen J.-M. Numerical Modelling of the Structures Behaviour under Fire Conditions, in French, Thesis submitted to obtain the degree "Agrégé de l'Enseignement Supérieur"; 1997.
Franssen J.-M., Schleich J.-B., Cajot L.-G. (1995) A simple model for fire resistance of axially-loaded members according to Eurocode 3. Journal Construct. Steel Research 35.
"Ultimate Limit State Calculation of Sway Frames with Rigid Joints," First Edition1984.
Franssen J.-M., Schleich J.-B., Cajot L.-G., Azpiazu W. (1996) A simple model for fire resistance of axially-loaded members - Comparison with experimental results. Journal Construct. Steel Research 37:175-204.
Eurocode 3, Design of Steel Structures, Part 1-2, General Rules and Rules for Buildings, Structural Fire Design, DAN Belge (Belgian National Application Document), July; 1998.
Eurocode 3, Design of Steel Structures, Part 1-2, General Rules and Rules for Buildings, Structural Fire Design, French National Application Document; .
