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

Document Type : Article

Authors

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

Abstract

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.

Keywords


References
1. Cousins, W., Thomas, G.C., Heron, D.W., et al. modelling
the spread of post-earthquake re 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
re 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 re 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
re 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 re 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
re", 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 re exposure", Earthquake
Spectra, 31(1), pp. 273{292 (2015).
17. Quiel, S.E. and Garlock, M.E. Modeling high-rise
steel framed buildings under re", 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, Speci cation 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 re 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 re 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 re", Engineering Structures,
32(1), pp. 80{92 (2010).
28. Sun, R., Huang, Z., and Burgess, I.W. Progressive
collapse analysis of steel structures under re conditions",
Engineering Structures, 34, pp. 400{413 (2012).
29. Memari, M. and Mahmoud, H. Performance of steel
moment resisting frames with RBS connections under
re 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,
Quali cation 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).