Computers and Concrete

  • 제25권6호
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  • Pages.497-507
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  • 2020
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  • 1598-8198(pISSN)
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  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

A numerical method for evaluating fire performance of prestressed concrete T bridge girders

  • Zhang, Gang (School of Highway, Chang'an University) ;
  • Kodur, Venkatesh (Department of Civil and Environmental Engineering, Michigan State University) ;
  • Song, Chaojie (School of Highway, Chang'an University) ;
  • Hou, Wei (School of Highway, Chang'an University) ;
  • He, Shuanhai (School of Highway, Chang'an University)
  • 투고 : 2019.07.08
  • 심사 : 2020.05.08
  • 발행 : 2020.06.25
⟨ 이전 논문 다음 논문 ⟩

초록

This paper presents a numerical method for evaluating fire performance of prestressed concrete (PC) T shaped bridge girders under combined effect of structural loading and hydrocarbon fire exposure conditions. A numerical model, developed using the computer program ANSYS, is employed to investigate fire response of PC T shaped bridge girders by taking into consideration structural inherent parameters, namely; arrangement of prestressing strands with in the girder section, thickness of concrete cover over prestressing strands, effective degree of prestress and content of prestressing strands. Then, a sequential thermo-mechanical analysis is performed to predict cross sectional temperature followed by mechanical response of T shaped bridge girders. The validity of the numerical model is established by comparing temperatures, deflections and failure time generated from fire tests. Through numerical studies, it is shown that thickness of concrete cover and arrangement of prestressing strands in girder section have significant influence on the fire resistance of PC T shaped bridge girders. Increase in effective degree of prestress in strands with triangular shaped layout and content in prestressing strands can slow down the progression of deflections in PC T shaped bridge girder towards the final stages of fire exposure, to thereby preventing sudden collapse of the girder. Rate of deflection based failure criterion governs failure in PC T shaped bridge girders under most hydrocarbon fire exposure conditions. Structural inherent parameters incorporated into sectional configuration can significantly enhance fire resistance of PC bridge girders; thus mitigating fire induced collapse of these bridge girders.

키워드

과제정보

The authors wish to acknowledge the support of the National Natural Science Foundation of China under Grant Number 51878057, Research Fund for the Central Universities of China under Grant Number 300102210217, Natural Science Foundation of Shaanxi under Grant Number 2018JM5018, Science and Technology Project of Transportation Construction from Ministry of Transport of the People's Republic of China under Grant Number 2011318812970, and Michigan State University. Any opinions, findings, conclusions, or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the institutions.

참고문헌

  1. Afaghi-Darabi, A. and Abdollahzadeh, G. (2019), "Effect of cooling rate on the post-fire behavior of CFST column", Comput. Concrete, 23(4), 281-294. https://doi.org/10.12989/cac.2019.23.4.281.
  2. Albero, V., Saura, H., Hospitaler, A., Montalva, J.M. and Romero, M.L. (2018), "Optimal design of prestressed concrete hollow core slabs taking into account its fire resistance", Adv. Eng. Softw., 122, 81-92. https://doi.org/10.1016/j.advengsoft.2018.05.001.
  3. Alos-Moya, J., Paya-Zaforteza, I., Hoppitaler, A. and Rinaudo, P. (2017), "Valencia bridge fire tests: experimental study of a composite bridge under fire", J. Constr. Steel Res., 138, 538-554. https://doi.org/10.1016/j.jcsr.2017.08.008.
  4. American Society for Testing and Materials (ASTM) (2014), Standard Test Methods for Determining Effects of Large Hydrocarbon Pool Fire on Structural Members and Assemblies, ASTM E1529-14a, West Conshohocken, PA.
  5. ANSYS (2013), ANSYS Metaphysics (Version 14.5), ANSYS Inc., Canonsburg, PA, USA.
  6. Atlanta Chinese Life Network (2017), City Hot Spots, the Fire Broke I85, Accessed on 17/12/2018. http://www.sohu.com/a/131391599_206381.
  7. Aziz, E., Kodur, V.K.R., Glassman, J. and Garlock, M.E.M. (2015), "Behavior of steel bridge girders under fire conditions", J. Constr. Steel Res., 106, 11-12. https://doi.org/10.1016/j.jcsr.2014.12.001.
  8. Balaji, A, Aathira, M.S., Pillai, T.M.M. and Nagarajan, P. (2016), "Reliability studies on RC beams exposed to fire based on IS456:2000 design methods", Struct. Eng. Mech., 59(5), 853-866. https://doi.org/10.12989/sem.2016.59.5.853.
  9. Bamonte, P., Kalaba, N. and Felicetti, R. (2018), "Computational study on prestressed concrete members exposed to natural fires", Fire Saf. J., 97, 54-65. https://doi.org/10.1016/j.firesaf.2018.02.006.
  10. BS476-20 (1987), Fire Tests on Building Materials and Structures-Part 20: Method for Determination of the Fire Resistance of Elements of construction, BSI, United Kingdom.
  11. China.com-News Channel (2017), Interstate Highway Bridge Fires and Collapses (Photos) in U.S. Accessed on 7/9/2018. https://news.china.com/international/1000/20170331/30377435.html.
  12. Du, Y., Sun, Y., Jiang, J. and Li, G.Q. (2019a), "Effect of cavity radiation on transient temperature distribution in steel cables under ISO834 fire", Fire Saf. J., 104, 79-89. https://doi.org/10.1016/j.firesaf.2019.01.002.
  13. Du, Y., Zhu, Y., Jiang, J. and Li, G.Q. (2019b), "Transient temperature distribution in pre-tensioned anchors of cable supported structures under ISO834 fire", Thin Wall. Struct., 138, 231-242. https://doi.org/10.1016/j.tws.2019.02.017.
  14. European Committee for Standardization (CEN) (2002), Actions on Structuresm Part 1.2 General Action-Action on Structures Exposed to Fire, Eurocode 1, Brussels, Belgium.
  15. European Committee for Standardization (CEN) (2004), Design of Concrete Structures, Part 1.2 General Rules-Structural Fire Design, Eurocode 2, Brussels, Belgium.
  16. European Committee for Standardization (CEN) (2005), Design of Steel Structures, Part 1.2 General Rules-Structural Fire Design, Eurocode 3, Brussels, Belgium.
  17. Garlock, M.E.M., Paya-Zaforteza, I., Kodur, V.K.R. and Gu L. (2012), "Fire hazard in bridges: review, assessment and repair strategies", Eng. Struct., 35(1), 89-98. https://doi.org/10.1016/j.engstruct.2011.11.002.
  18. Huanqiu News (2017), Interstate Highway Georgia Bridge Collapsed in Fire, Accessed on 9/5/2020. https://world.huanqiu.com/gallery/9CaKrnQhC6g?qq-pf-to=pcqq.c2c.
  19. International Standard Organization (ISO) (1999), Fire Resistance Tests-Elements of Building Construction-Part 1: General Requirements, ISO834, Genva, Switerland.
  20. Khalaf, J. and Huang, Z.H. (2016), "Analysis of the bond behaviour between prestressed strands and concrete in fire", Constr. Build. Mater., 128, 12-23. https://doi.org/10.1016/j.conbuildmat.2016.10.016.
  21. Kim, G.J. and Kwak, H.G. (2017), "Depth-dependent evaluation of residual material properties of fire-damaged concrete", Comput. Concrete, 20(4), 503-509. https://doi.org/10.12989/cac.2017.20.4.503.
  22. Kodur, V.K.R. and Dwaikat, M. (2008), "A numerical model for predicting the fire resistance of reinforced concrete beams", Cement Concrete Compos., 30(5), 431-443. https://doi.org/10.1016/j.cemconcomp.2007.08.012.
  23. Kodur, V.K.R. and Naser, M.Z. (2019), "Designing steel bridges for fire safety", J. Constr. Steel Res., 156, 46-53. https://doi.org/10.1016/j.jcsr.2019.01.020.
  24. Kodur, V.K.R. and Shakya, A.M. (2014), "Modeling the response of precast prestressed concrete hollow-core slabs exposed to fire", PCI J., 59(3), 78-94. https://doi.org/10.15554/pcij.06012014.78.94
  25. Li, W. and Guo, Z. (1993), "Experimental investigation of strength and deformation of concrete at elevated temperature", J. Build. Struct., 14(1), 8-16.
  26. Lie, T.T. and Denham, E.M.A. (1993), "Factors affecting the fire resistance of circular hollow steel columns filled with bar-reinforced concrete", NRC-CNRC Internal Report No. 651, Ottawa, Canada.
  27. Maintenance Oonline (2017), G80 Guangkun Expressway Bridge Fire Rescue and Emergency Treatment Documentary, Accessed on 9/13/2018. http://www.sohu.com/a/161425875_99915349.
  28. Nahid, M.N.H., Sotelino, E.D. and Lattimer, B.Y. (2017). "Thermo-structural response of highway bridge structures with tub girders and plate girders", J. Bridge Eng., 22(10), 1-17. https://doi.org/10.1061/(ASCE)BE.1943-5592.0001029.
  29. New York State Department of Transportation (2008), Bridge Fire Incidents in New York State, New York State Department of Transportation, USA.
  30. Peoplerail.com (2017), Guangji Expressway Liujiafang Separated Interchange First T Brige Gider Successfully Erected. http://www.peoplerail.com/rail/show-478-343413-1.html.
  31. Peris-Sayol, G., Paya-Zaforteza, I., Alos-Moya, J. and Hospitaler, A. (2015), "Analysis of the influence of geometric, modeling and environmental parameters on the fire response of steel bridges subjected to realistic fire scenarios", Compu. Concrete, 158, 333-345. https://doi.org/10.1016/j.compstruc.2015.06.003.
  32. Quiel, S.E., Yokoyama, T., Bregman, L.S., Mueller, K.A. and Marjanishvili, S.M. (2015), "A streamlined framework for calculating the response of steel-supported bridges to open-air tanker truck fires", Fire Saf. J., 73, 63-65. https://doi.org/10.1016/j.firesaf.2015.03.004.
  33. Sadaghian, H. and Farzam, M. (2019), "Numerical investigation on punching shear of RC slabs exposed to fire", Comput. Concrete, 23(3), 217-233. https://doi.org/10.12989/cac.2019.23.3.217.
  34. Shakya, A.M. and Kodur, V.K.R. (2015), "Response of precast prestressed concrete hollowcore slabs under fire conditions", Eng. Struct., 87, 126-138. https://doi.org/10.1016/j.engstruct.2015.01.018.
  35. Song, C.J., Zhang, G., He, S.H. and Hou, W. (2020), "Performance of prestressed concrete box bridge girders under hydrocarbon fire exposure conditions", Adv. Struct. Eng., 23(8), 1521-1533. https://doi.org/10.1177/1369433219898102.
  36. Willam, K. and Warnke, E. (1975), "Constitutive model for the triaxial behavior of concrete", Proceedings of Concrete Structures Subjected to Triaxial Stresses, International Association for Bridge and Structural Engineering, Zurich, Switzerland.
  37. Zhang, G., Kodur, V.K.R., Hou, W. and He, S.H. (2017a), "Evaluating fire resistance of prestressed concrete bridge girders", Struct. Eng. Mech., 62(6), 663-674. https://doi.org/10.12989/sem.2017.62.6.663.
  38. Zhang, G., Kodur, V.K.R., Yao, W.F. and Huang, Q. (2019), "Behavior of composite box bridge girders under localized fire exposure conditions", Struct. Eng. Mech., 69(2), 193-204. https://doi.org/10.12989/sem.2019.69.2.193.
  39. Zhang, G., Zhu, M., He, S. and Hou, W. (2017b), "Thermo-mechanical behavior of prestressed concrete box girder at hydration age", Compu. Concrete, 20(5), 529-537. https://doi.org/10.12989/cac.2017.20.5.529.
  40. Zhang, G., Zhu, M.C., Kodur, V.K.R. and Li, G.Q. (2017c), "Behavior of welded connections after exposure to elevated temperature", J. Constr. Steel Res., 320, 88-95. https://doi.org/10.1016/j.jcsr.2016.12.004.