DOI QR코드

DOI QR Code

Prediction of response of reinforced concrete frames exposed to fire

Balaji, Aneesha;Muhamed Luquman, K.;Nagarajanb, Praveen;Pillai, T.M. Madhavan

  • Received : 2015.08.16
  • Accepted : 2015.12.23
  • Published : 2016.01.25

Abstract

The objective of this work is to study the restraining effect in fire resistance of framed structures and to evaluate the global response of reinforced concrete frames when exposed to fire based on advanced finite element method. To study the response a single portal frame is analyzed. The effect of floor slab on this frame is studied by modeling a beam-column-slab assembly. The evolution of temperature distribution, internal stresses and deformations of the frame subjected to ISO 834 standard fire curve for both the frames are studied. The thermal and structural responses are evaluated and a comparison of results of individual members and entire structure is done. From the study it can be seen that restraining forces has significant influence on both stresses and deflection and overall response of the structure when compared to individual structural member. Among the various structural elements, columns are the critical members in fire and failure of column causes the failure of entire structure. The fire rating of various structural elements of the frame is determined by various failure criteria and is compared with IS456 2000 tabulated fire rating.

Keywords

reinforced concrete;fire safety;fire resistance;thermal analysis;thermo-structural analysis

References

  1. ANSYS Release 14.0 (2010), Documentation for ANSYS.
  2. (1987), Fire tests on building materials and structures -Part 20: Method for determination of the fire resistance of elements of construction (general principles), British Standards Institution.
  3. Di Capua, D. and Mari, A.R. (2007), "Nonlinear analysis of reinforced concrete cross-sections exposed to fire", Fire Saf. J., 42(2), 139-149. https://doi.org/10.1016/j.firesaf.2006.08.009
  4. Eurocode 2 (2004), Design of concrete structures- Part 1-2: General rules- Structural Fire Design (EN 1992-1-2), Commission of European Committee for Standardization, Brussels.
  5. Guo, Z. and Shi, X. (2011), Experiment and Calculation of Reinforced Concrete at Elevated Temperatures, Tsinghua University Press, Published by Elsevier Inc.
  6. ISO 834-1(1999), Fire resistance tests-elements of building construction, Part1: General requirement, International Organization for Standardization, Geneva.
  7. IS 3809 (1979), Fire resistance test of structures, Bureau of Indian Standards, New Delhi.
  8. IS 456 (2000), Plain and reinforced concrete- Code of Practice, Fourth revision, Bureau of Indian Standards, New Delhi.
  9. James, A. and Milke, P.E. (1999), "Analytical methods to evaluate fire resistance of structural members", J. Struct. Eng., 125(10), 1179-1187. https://doi.org/10.1061/(ASCE)0733-9445(1999)125:10(1179)
  10. Jowse, A., Torero, J.L., Usmani, A., Lane, B. and Lamont, S. (2005), "Determination of fire induced collapse mechanisms of multi-storey steel framed structures", Fourth European Conference on Steel and Composite Structures, Maastricht, Netherlands.
  11. Al-Jabri, K.S., Davison, J.B. and Burgess, I.W. (2008), "Performance of beam-to-column joints in fire-a review", Fire Saf. J., 43(1), 50-62. https://doi.org/10.1016/j.firesaf.2007.01.002
  12. Kodur, V.K.R. and Dwaikat, M. (2008), "Flexural response of reinforced concrete beams exposed to fire", Struct. Concrete, 9(1), 45-54. https://doi.org/10.1680/stco.2008.9.1.45
  13. Pyl, L., Schueremans, L., Dierckx, W. and Georgieva, I. (2012), "Fire safety analysis of a 3D frame structure based on a full-scale fire test", Thin-Wall. Struct., 61, 204-212. https://doi.org/10.1016/j.tws.2012.03.023
  14. Ma, K.Y. and Richard Liew, J.Y. (2004), "Nonlinear plastic hinge analysis of three-dimensional steel frames in fire", J. Struct. Eng., 130(7), 981-990. https://doi.org/10.1061/(ASCE)0733-9445(2004)130:7(981)
  15. Valipour, H.R. and Foster, S.J. (2010), "Finite element modelling of reinforced concrete framed structures including catenary action", Comput. Struct., 88(9), 529-538. https://doi.org/10.1016/j.compstruc.2010.01.002
  16. Vecchio, F.J. (1987), "Nonlinear analysis of reinforced concrete frames subjected to thermal and mechanical loads", ACI Struct. J., 84(S51), 492-501.