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Advances in Concrete Construction   Volume 1, Number 1, March 2013, pages 29-44
DOI: http://dx.doi.org/10.12989/acc.2013.1.1.029
 
Methodology for investigating the behavior of reinforced concrete structures subjected to post earthquake fire
Behrouz Behnam, Hamid R. Ronagh and Hassan Baji

 
Abstract     [Full Text]
    Post earthquake fire (PEF) can lead to the collapse of buildings that are partially damaged in a prior ground-motion that occurred immediately before the fire. The majority of standards and codes for the design of structures against earthquake ignore the possibility of PEF and thus buildings designed with those codes could be too weak when subjected to a fire after an earthquake. An investigation based on sequential analysis inspired by FEMA356 is performed here on the Life-Safety performance level of structures designed to the ACI 318-08 code after they are subjected to two different earthquake levels with PGA of 0.35 g and 0.25 g. This is followed by a four-hour fire analysis of the weakened structure, from which the time it takes for the weakened structure to collapse is calculated. As a benchmark, the fire analysis is also performed for undamaged structure and before occurrence of earthquake. The results show that the vulnerability of structures increases dramatically when a previously damaged structure is exposed to PEF. The results also show the damaging effects of post earthquake fire are exacerbated when initiated from second and third floor. Whilst the investigation is for a certain class of structures (regular building, intermediate reinforced structure, 3 stories), the results confirm the need for the incorporation of post earthquake fire in the process of analysis and design and provides some quantitative measures on the level of associated effects.
 
Key Words
    fire resistance rating; performance based design; post earthquake fire; reinforced concrete structures; sequential analysis
 
Address
Behrouz Behnam, Hamid R. Ronagh and Hassan Baji: School of Civil Engineering, The University of Queensland, Australia
 
References
    -acc0101002-
  1. ABAQUS (2008), 6.8, Dassault systemes simulia corp: Providence.
  2. ACI318 (2008), Building code requirements for structural concrete (ACI 318-08) and commentary, America, American Concrete Institute.
  3. Bhargava, P., Sharma, U.K., Singh, Y., Singh, B., Usmani, A., Torero, J., Gillie, M., Pankaj, P., May, I. and Manohar, C.S. (2010), "Fire testing of an earthquake damaged RC frame", Sixth International Conference, Structures in Fire, Lancaster, Pennsylvania, USA., DEStech Publications, Inc.
  4. Cardone, D., Palermo, G. and Dolce, M. (2009), "Direct displacement-based design of buildings with different seismic isolation systems", J. Earthq. Eng., 14(2), 163-191.
  5. Chen. S., Lee. George C. and Shinozuka, M. (2004), "Hazard mitigation for earthquake and subsequent fire", Annual meeting: Networking of young earthquake engineering researchers and professionals, Honolulu, Hawaii, Multidisciplinary Centre for Earthquake Engineering Research, Buffalo, N.Y., USA.
  6. Della Corte, G., Landolfo, R. and Mazzolani, F.M. (2003), "Post earthquake fire resistance of moment resisting steel frames", Fire Safety J., 38(7), 593-612.
  7. Drysdale, D. (2011), Introduction to fire dynamics, (3rd Edition), John Wiley & Sons.
  8. Ervine, A., Gillie, M., Stratford, T.J. and Pankaj, P. (2012), "Thermal propagation through tensile cracks in reinforced concrete", J. Mater. Civil Eng., 24(5), 516-522.
  9. Faggiano, B. and Mazzolani, F.M. (2011), "Fire after earthquake robustness evaluation and design: Application to steel structures", Steel Constr., 4(3), 183-187.
  10. Franssen, J.M. (2011), User’s manual for SAFIR 2011 a computer program for analysis of structures subjected to fire, University of Liege, Belgium.
  11. International Building Code (2006), IBC, Facilities 3, NFPA 101-100, America, National Fire Protection.
  12. Kabeyasawa, T. and Mostafaei, H. (2007), "Axial-shear-flexure interaction approach for reinforced concrete columns", ACI Struct. J., 104(2), 218-226.
  13. Kodur, V.K.R. and Dwaikat, M. (2007), "Performance-based fire safety design of reinforced concrete beams", J. Fire Protection Eng., 17, 293-320.
  14. Kwak, H.G. and Kim, S.P. (2010), "Simplified monotonic moment-curvature relation considering fixed-end rotation and axial force effect", Eng. Struct., 32(1), 69-79.
  15. Kwasniewski, A. (2011), Analyses of structures under fire, Warsaw University of Technology, Warsaw, Poland.
  16. Lennon, T. (2011), Structural fire engineering, London, England, ICE Publishing.
  17. Lundin, J. (2005), "On quantification of error and uncertainty in two-zone models used in fire safety design", J. Fire Sci., 23(4), 329-354.
  18. Meada, M. and Kang, D. (2009), "Post-earthquake damage evaluation of RC buildings", J. Adv. Concrete Tech., 7(3), 327-335.
  19. Minson, A. (2006), "Eurocode 2-3", Concrete Struct., 40(1), 30-31.
  20. Mostafaei, H. and Kabeyasawa, T. (2010), "Performance of a six-story reinforced concrete structure in post-earthquake fire", 10th Canadian Conference on Earthquake Engineering, Toronto, Ontario, Institute for Research in Construction.
  21. Mousavi, S., Kodur, V.K.R. and Bagchi, A. (2008), "Review of post earthquake fire hazard to building structures", Can. J. Civil Eng., 35(7), 689-698.
  22. National Research Council Canada (2005), National fire code in buildings, Ottawa, Canada, National Research Council Canada.
  23. Park, R. and Paulay, T. (1975), Reinforced concrete structures, New York, John Wiley & Sons.
  24. Remesh, K. and Tan, K.H. (2007), "Performance comparison of zone models with compartment fire tests", J. Fire Sci., 25(4), 321-353.
  25. SAP2000-V14 (2002), Integrated finite element analysis and design of structures basic analysis reference manual, Berkeley, CA, USA.
  26. Taylor, J. (2003), Post earthquake fire in tall buildings and the New Zealand building code, Master of Science research, University of Canterbury.
  27. Youssef, M.A. and Moftah, M. (2007), "General stress-strain relationship for concrete at elevated temperatures", Eng. Struct., 29(10), 2618-2634.
  28. Zaharia, R. and Pintea, D. (2009), "Fire after earthquake analysis of steel moment resisting frames", Int. J. Steel Struct., 9(4), 275-284.
 

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