DOI QR코드

DOI QR Code

Effect of creep on behaviour of steel structural assemblies in fires

  • Cesarek, Peter (University of Ljubljana, Faculty of Civil and Geodetic Engineering) ;
  • Kramar, Miha (ZAG - Slovenian National building and Civil Engineering Institute, Section for Metal, Timber and Polymeric Structures) ;
  • Kolsek, Jerneja (ZAG - Slovenian National building and Civil Engineering Institute, Fire Laboratory and Fire Engineering)
  • 투고 : 2017.12.03
  • 심사 : 2018.09.19
  • 발행 : 2018.11.25

초록

There are presently two general ways of accounting for hazardous metal creep in structural fire analyses: either we incorporate creep strains implicitly in hardening model ('implicit-creep' plasticity) or we account for creep explicitly ('explicit-creep' plasticity). The first approach is simpler and usually used for fast engineering applications, e.g., following proposals of EN 1993-1-2. Prioritizing this approach without consideration of its limitations, however, may lead to significant error. So far the possible levels of such error have been demonstrated by few researchers for individual structural elements (i.e., beams and columns). This paper, however, presents analyses also for selected beam-girder assemblies. Special numerical models are developed correspondingly and they are validated and verified. Their important novelty is that they do not only account for creep in individual members but also for creep in between-member connections. The paper finally shows that outside the declared applicability limits of the implicit-creep plasticity models, the failure times predicted by the applied alternative explicit-creep models can be as much as 40% shorter. Within the limits, however, the discrepancies might be negligible for majority of cases with the exception of about 20% discrepancies found in one analysed example.

키워드

과제정보

연구 과제 주관 기관 : Slovenian Research Agency

참고문헌

  1. ABAQUS (2016), Documentation, DS-Simulia; Providence, RI, USA, AISC.
  2. Anderberg, Y. (1988), "Modelling steel behaviour", Fire Saf. J., 13, 17-26. https://doi.org/10.1016/0379-7112(88)90029-X
  3. EN 1993-1-2 (2004), Eurocode 3: Design of Steel Structures. Part 1.2: General rules - Structural fire design, European Committee for Standardization; Brussels, Belgium.
  4. EN 1363-1 (2012), Fire resistance tests, Part 1: General requirements, European Committee for Standardization; Brussels, Belgium.
  5. Chan, Y.K., Iu, C.K., Chan, S.L. and Albermani, F.G. (2010), "Performance-based structural fire design of steel frames using conventional computer software", Steel Compos. Struct., Int. J., 10(3), 207-222.
  6. Cowan, M. and Khandelwal, K. (2014), "Modeling of high temperature creep in ASTM A992 structural steels", Eng. Struct., 80, 426-434. https://doi.org/10.1016/j.engstruct.2014.09.020
  7. Harmathy, T.Z. (1967), "A comprehensive creep model", J. Basic Eng., 89, 496-502. https://doi.org/10.1115/1.3609648
  8. Huang, Z.F., Tan, K.H. and Ting, S.K. (2006), "Heating rate and boundary restraint effects on fire resistance of steel columns with creep", Eng. Struct., 28, 805-817. https://doi.org/10.1016/j.engstruct.2005.10.009
  9. Kirby, B.R. (1995), "The behavior of high-strength grade 8.8 bolts in fire", J. Constr. Steel. Res., 33, 3-38. https://doi.org/10.1016/0143-974X(94)00013-8
  10. Kirby, B.R. and Preston, R.R. (1988), "High temperature properties of hot-rolled, structural steels for use in fire engineering design studies", Fire Saf. J., 13, 27-37. https://doi.org/10.1016/0379-7112(88)90030-6
  11. Kodur, V.K.R. and Dwaikat, M.M.S. (2010), "Effect of high temperature creep on the fire response of restrained steel beams", Mater. Struct., 43, 1327-1341.
  12. Kodur, V., Dwaikat, M. and Fike, R. (2010), "High-temperature properties of steel for fire resistance modeling of structures", J. Mater. Civ. Eng., 22, 423-434.
  13. Kolsek, J. and Cesarek, P. (2015), "Performance-based fire modeling of intumescent painted steel structures and comparison to EC3", J. Constr. Steel. Res., 104, 91-103. https://doi.org/10.1016/j.jcsr.2014.10.008
  14. Kolsek, J., Planinc, I., Saje, M. and Hozjan, T. (2013), "The fire analysis of a steel-concrete side-plated beam", Finite Elem. Anal. Des., 74, 93-110. https://doi.org/10.1016/j.finel.2013.06.001
  15. Kolsek, J., Planinc, I., Saje, M. and Hozjan, T. (2014), "A fully generalised approach to modelling fire response of steel-RC composite structures", Int. J. Nonlin. Mech., 67, 382-393. https://doi.org/10.1016/j.ijnonlinmec.2014.10.015
  16. Li, G.Q. and Zhang, C. (2012), "Creep effect on buckling of axially restrained steel columns in real fires", J. Constr. Steel Res., 71, 182-188. https://doi.org/10.1016/j.jcsr.2011.09.006
  17. Luecke, W.E., McColskey, J.D., McCowan, C.N., Banovic, S.W., Fields, R.J., Foecke, T., Siewert, T.A. and Gayle, F.W. (2005), "NIST NCSTAR 1-3D: Federal Building and Fire Safety Investigation of the World Trade Center Disaster: Mechanical Properties of Structural Steel", Research Report No. NIST NCSTAR 1-3D; NIST National Institute of Standards and Technology, Technology Administration, U.S. Department of Commerce, U.S. Government Printing Office, Washington, DC, USA.
  18. Poh, K.W. (2001), "Stress-strain-temperature relationship for structural steel", J. Mater. Civil Eng., 13, 371-379.
  19. Poh, K.W. (2014), "Erratum for 'Stress-strain temperature relationship for structural steel'", J. Mater. Civil. Eng., 26, 388-389. https://doi.org/10.1061/(ASCE)MT.1943-5533.0000902
  20. Poh, K.W. and Skarajew, M. (1995), "Elevated temperature tensile testing of grade 300PLUSe hot rolled structural steel", Rep. No. BHPR/SM/R/007; BHP Research Melbourne Labs, Melbourne, Australia.
  21. Rubert, A. and Schaumann, P. (1985), "Temperaturabhangige Werkstoffeigenschaften von Baustahl bei Brandbeanspruchung", Stahlbau, 3, 81-86.
  22. Simo, J.C. and Hughes, T.J.R. (1998), Computational Inelasticity, Springer-Verlag, New York, NY, USA.
  23. Toric, N. and Burgess, I.W. (2016), "A unified rheological model for modelling steel behaviour in fire conditions", J. Constr. Steel Res., 127, 221-230. https://doi.org/10.1016/j.jcsr.2016.07.031
  24. Toric, N., Harapin, A. and Boko, I. (2013), "Experimental verification of a newly developed implicit creep model for steel structures exposed to fire", Eng. Struct., 57, 116-124.
  25. Toric, N., Harapin, A. and Boko, I. (2015), "Modelling of the influence of creep strains on the fire response of stationary heated steel members", J. Struct. Fire Eng., 6, 155-176. https://doi.org/10.1260/2040-2317.6.3.155
  26. Toric, N., Sun, R.R. and Burgess, I.W. (2016a), "Creep-free fire analysis of steel structures with Eurocode 3 material model", J. Struct. Fire Eng., 7, 234-248. https://doi.org/10.1108/JSFE-09-2016-016
  27. Toric, N., Sun, R.R. and Burgess, I.W. (2016b), "Development of a creep-free stress-strain law for fire analysis of steel structures", Fire. Mater., 40, 896-912. https://doi.org/10.1002/fam.2347
  28. Toric, N., Brnic, J., Boko, I., Brcic, M., Burgess, I.W. and Glavinic, I.U. (2017), "Development of a high temperature material model for grade S275JR steel in fire", J. Constr. Steel Res., 137, 161-168.
  29. Wald, F., da Silva, L.S., Moore, D.B., Lennon, T., Chladna, M., Santiago, A., Benes, M. and Borges, L. (2006), "Experimental behaviour of a steel structure under natural fire", Fire Saf. J., 41, 509-522. https://doi.org/10.1016/j.firesaf.2006.05.006
  30. Williams-Leir, G. (1983), "Creep of structural steel in fire: Analytical expressions", Fire Mater., 7, 73-78. https://doi.org/10.1002/fam.810070205
  31. Witteveen, J. and Twilt, L. (1975), "Behaviour of steel columns under fire action", International Colloquium on Column Strength, Paris, Volume 23.
  32. Yang, K.C. and Yua, Z.H. (2013), "Experimental research on the creep buckling of fire-resistant steel columns at elevated temperature", Steel Compos. Struct., Int. J., 15(2), 163-173. https://doi.org/10.12989/scs.2013.15.2.163