Collapse assessment of protected steel moment frame under post-earthquake fire

Document Type : Article


Department of Civil Engineering, Semnan University, Semnan, P.O. Box 3513119111, Iran


This paper investigates the behavior of low-, medium- and high-rise protected steel moment resisting frames under post-earthquake fire through two different methods. In the first method, the pushover analysis is utilized to simulate the response of the sample structures for various target displacements. Then the thermo-mechanical analysis is implemented to evaluate the behavior of the damaged frames under fire, assuming that the fireproofing is delaminated
at the end regions of the beams. In the second method, the seismic response of the frames under two sets of the MCE-scaled near and far fault ground motion records is determined employing the time history analysis. In this method, the damage of fireproofing is characterized by the maximum inter-story drift ratio. The results of the study revealed that the method 1 give similar results to the method 2, for most cases. It is also found that for sufficiently large drift
demands, the collapse of the frames under post-earthquake fire occurs in side-way mode, while for lower seismic responses, the local failure of beams dominates other failure modes. Moreover, it was found that the reduction of fire resistance time due to the effects of MCE seismic loads ranges 4% to 26% for the considered structures.


1. Cousins, W., Thomas, G.C., Heron, D.W., et al. modelling  the spread of post-earthquake fire in Wellington  City", In Proc. of the 2002 Technical Conference and  AGM, New Zealand Society for Earthquake Engineering,  Napier (2002).  
2. Buchanan, A.H., Fire Engineering Design Guide, Centre  for Advanced Engineering, University of Canterbury  (2001).  
3. Chicchi, R. and Varma, A.H. Research review: Postearthquake  fire assessment of steel buildings in the  United States", Advances in Structural Engineering,  21(1), pp. 138{154 (2018). DOI: 1369433217711617  
4. Nishino, T., Tanaka, T., and Hokugo, A. An evaluation  method for the urban post-earthquake _re  risk considering multiple scenarios of _re spread and  evacuation", Fire Safety Journal, 54, pp. 167{180  (2012).  2788 P. Mirzaei and M. Gerami/Scientia Iranica, Transactions A: Civil Engineering 27 (2020) 2775{2789  
5. Della Corte, G., Landolfo, R., and Mazzolani, F.  Post-earthquake fire resistance of moment resisting  steel frames", Fire Safety Journal, 38(7), pp. 593{612  (2003).  
6. Faggiano, B. Fire after earthquake", In Proc. from  WG1 Meeting on Urban Habitat Constructions under  Catastrophic Event, Prague (2007).  
7. Faggiano, B., De Gregorio, D., and Mazzolani, F. Assessment  of the robustness of structures subjected to  fire following earthquake through a performance-based  approach", In Proc. Int. Conference Urban Habitat  Constructions under Catastrophic Events (COST C26  Action), Naples, Italy (2010).  
8. Zaharia, R. and Pintea, D. Fire after earthquake analysis  of steel moment resisting frames", International  Journal of Steel Structures, 9(4), pp. 275{284 (2009).  
9. Behnam, B. and Ronagh, H.R. Behavior of momentresisting  tall steel structures exposed to a vertically  traveling post-earthquake _re", The Structural Design  of Tall and Special Buildings, 23(14), pp. 1083{1096  (2014).  
10. Behnam, B. and Ronagh, H.R. Post-earthquake _re  performance-based behavior of unprotected moment  resisting 2D steel frames", KSCE Journal of Civil  Engineering, 19(1), pp. 274{284 (2015).  
11. Memari, M., Mahmoud, H., and Ellingwood, B.  Post-earthquake fire performance of moment resisting  frames with reduced beam section connections", Journal  of Constructional Steel Research, 103, pp. 215{229  (2014).  
12. Elhami Khorasani, N., Garlock, M., and Gardoni, P.  Probabilistic performance-based evaluation of a tall  steel moment resisting frame under post-earthquake  _res", Journal of Structural Fire Engineering, 7(3), pp.  193{216 (2016). 
13. Behnam, B. Structural response of vertically irregular  tall moment-resisting steel frames under pre-and postearthquake  fire", The Structural Design of Tall and  Special Buildings, 25(12), pp. 543{557 (2016).  
14. Braxtan, N.L. and Pessiki, S., Seismic Performance  of Sprayed Fire Resistive Material (SFRM) on Steel  Moment Frame Buildings, Lehigh University (2010).  
15. Leo Braxtan, N. and Pessiki, S. Bond performance of  SFRM on steel plates subjected to tensile yielding",  Journal of Fire Protection Engineering, 21(1), pp. 37{  55 (2011).  
16. Keller, W.J. and Pessiki, S. E_ect of earthquakeinduced  damage on the side-way response of steel  moment-frame buildings during fire exposure", Earthquake  Spectra, 31(1), pp. 273{292 (2015).  
17. Quiel, S.E. and Garlock, M.E. Modeling high-rise  steel framed buildings under fire", In Structures Cong.  Crossing Borders (2008).  
18. Iranian National Building Regulations Loads on Building  code NO. 6, Iran National Building Regulations  Center, INBR publications, Tehran (2008). 
19. Standard No. 2800, Building & Housing Research  Center, Iranian Code of Practice for Seismic Resistant  Design of Buildings, Iran (2015).  
20. ANSI/AISC 360-10, American Institute of Steel Construction,  INC, Specification for Structural Steel Buildings,  Chicago, Illinois (2010).  
21. Daryan, A.S., Sadri, M., Saberi, H., et al. Rotational  castellated steel beams", The Structural Design of Tall  and Special Buildings, 22(12), pp. 941{953 (2013).  
22. Toh, W., Tan, K., and Fung, T. Strength and stability  of steel frames in _re: Rankine approach", Journal of  Structural Engineering, 127(4), pp. 461{469 (2001).  
23. Charney, F.A. and Marshall, J. A comparison of the  Krawinkler and scissors models for including beamcolumn  joint deformations in the analysis of momentresisting  steel frames", Engineering Journal-American  Institute of Steel Construction INC, 43(1), pp. 31{48  (2006).  
24. EN 1993-1-2 European standard, Eurocode 3: Design  of steel structures, Part 1-2: Structural fire design,  CEN, Brussels, Belgium (2005).  
25. Bastami, M., Chaboki-Khiabani, A., Baghbadrani,  M., et al. Performance of high strength concretes at  elevated temperatures", Scientia Iranica, 18(5), pp.  1028{1036 (2011).  
26. Rubert, A. and Schaumann, P. Structural steel and  plane frame assemblies under fire action", Fire Safety  Journal, 10(3), pp. 173{184 (1986).  
27. Lien, K., Chiou, Y.J., Wang, R.Z., et al. Vector form  intrinsic _nite element analysis of nonlinear behavior  of steel structures exposed to fire", Engineering Structures,  32(1), pp. 80{92 (2010).  
28. Sun, R., Huang, Z., and Burgess, I.W. Progressive  collapse analysis of steel structures under fire conditions",  Engineering Structures, 34, pp. 400{413 (2012).  
29. Memari, M. and Mahmoud, H. Performance of steel  moment resisting frames with RBS connections under  fire loading", Engineering Structures, 75, pp. 126{138  (2014).  
30. Baker, J.W. Quantitative classi_cation of near-fault  ground motions using wavelet analysis", Bulletin of the  Seismological Society of America, 97(5), pp. 1486{1501  (2007).  
31. FEMA P695 Federal Emergency Management Agency,  Qualification of Building Seismic Performance Factors,  USA (2009).  
32. EN 1991-1-2 European standard, Eurocode 1: Action  on structures, Part 1-2: Action on Structures Exposed  to Fire, CEN, Brussels, Belgium (2002).  
33. Underwriters' Laboratories, Fire Resistance Directory,  1 (1992).  P. Mirzaei and M. Gerami/Scientia Iranica, Transactions A: Civil Engineering 27 (2020) 2775{2789 2789  
34. Cadorin, J.F., Pintea, D., Dotreppe, J.C., et al. A tool  to design steel elements submitted to compartment  _res-OZone V2. Part 2: Methodology and application",  Fire Safety Journal, 38(5), pp. 429{451 (2003).  
35. ASCE Publications, Seismic Rehabilitation of Existing  Buildings, 41 (2007).