Steel and Composite Structures

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Performance of steel beams at elevated temperatures under the effect of axial restraints

  • Liu, T.C.H. (Manchester School of Engineering) ;
  • Davies, J.M. (Manchester School of Engineering)
  • Published : 2001.12.25
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Abstract

The growing use of unprotected or partially protected steelwork in buildings has caused a lively debate regarding the safety of this form of construction. A good deal of recent research has indicated that steel members have a substantial inherent ability to resist fire so that additional fire protection can be either reduced or eliminated completely. A performance based philosophy also extends the study into the effect of structural continuity and the performance of the whole structural totality. As part of the structural system, thermal expansion during the heating phase or contraction during the cooling phase in most beams is likely to be restrained by adjacent parts of the whole system or sub-frame assembly due to compartmentation. This has not been properly addressed before. This paper describes an experimental programme in which unprotected steel beams were tested under load while it is restrained between two columns and additional horizontal restraints with particular concern on the effect of catenary action in the beams when subjected to large deflection at very high temperature. This paper also presents a three-dimensional mathematical modelling, based on the finite element method, of the series of fire tests on the part-frame. The complete analysis starts with an evaluation of temperature distribution in the structure at various time levels. It is followed by a detail 3-D finite element analysis on its structural response as a result of the changing temperature distribution. The principal part of the analysis makes use of an existing finite element package FEAST. The effect of columns being fire-protected and the beam being axially restrained has been modelled adequately in terms of their thermal and structural responses. The consequence of the beam being restrained is that the axial force in the restrained beam starts as a compression, which increases gradually up to a point when the material has deteriorated to such a level that the beam deflects excessively. The axial compression force drops rapidly and changes into a tension force leading to a catenary action, which slows down the beam deflection from running away. Design engineers will be benefited with the consideration of the catenary action.

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References

  1. Allam, A.M., Green, M.G., Burgess, I.W. and Plank, R.J. (1998), "Fire engineering design of steel-framed structuresintegration of design and research," J. Construct. Steel Res., 46(1-3), 296-297, paper number 170. https://doi.org/10.1016/S0143-974X(98)80033-3
  2. Armer, G.S.T. (1994), "The development of the large building test facility", First Cardington Conference: First Results from The Large Building Test Facility.
  3. Bailey, C.G., Burgess, I.W. and Plank, R.J. (1996), "Computer simulation of a full-scale structural fire test", The Structural Engineers, London, 74,6, 93-100.
  4. British Standards Institution (1990), BS5950: Structural Use of Steelwork in Buildings, Part 8: Code of Practice for Fire Resistant Design.
  5. British Standards Institution (1995), ENV 1993-1-2, Eurocode 3: Design of steel structures: Part 1.2 General rules Structural fire design.
  6. Burgress, I.W., El-Rimawi, J.A. and Plank, R.J. (1990), "Analysis of beams with non-uniform temperature profile due to fire", J. Const. Steel Research, 16, 169-192. https://doi.org/10.1016/0143-974X(90)90008-5
  7. Lawson, R.M. (1990), "Behaviour of steel beam-to-column connections in fire", The Structural Engineer, 68(14), 263-271.
  8. Leston-Jones, L.C., Burgess, I.W., Lennon, T. and Plank R.J. (1997), "Elevated-temperature moment-rotation tests on steelwork connections", Proc. Instn Civ. Engrs, Structures & Bldgs, 122 Nov., 410-419. https://doi.org/10.1680/istbu.1997.29830
  9. Liu, T.C.H (1996), "Finite element modelling of behaviour of steel beams and connections in fire", J. Construct. Steel Research, 36(3), 181-199. https://doi.org/10.1016/0143-974X(95)00016-O
  10. Liu T.C.H. (1999), "Moment-rotation-temperature characteristics of steel/composite connections", J. Struct. Eng. Proc of ASCE, 125(10), October, 1188-1198. https://doi.org/10.1061/(ASCE)0733-9445(1999)125:10(1188)
  11. Liu T.C.H., Davies, J.M., Fahad, M. (2001), "Catenary effect in axially restrained steel beams in fire", ICSCS'01, South Korea, 1168-1177.
  12. Saab, H.A. and Nethercot, D.A. (1991), "Modelling steel frame behaviour under fire conditions", Eng. Struct., October 371-382.
  13. Thomas, I.R., Bennetts, I.D., Dayawansa, P., Proe, D.J. and Lewins, R.R. (1992), "Fire tests of the 140 William street", BHP Research - Melbourne Laboratories, rep. No. BHPR/ENGr/92/043/SG2C, February.

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