DOI QR코드

DOI QR Code

Time-dependent buckling analysis of SiO2 nanoparticles reinforced concrete columns exposed to fire

  • Bidgoli, M. Rabani (Department of Civil Engineering, Jasb Branch, Islamic Azad University) ;
  • Saeidifar, M. (Department of Civil Engineering, Jasb Branch, Islamic Azad University)
  • 투고 : 2017.02.25
  • 심사 : 2017.03.30
  • 발행 : 2017.08.25

초록

Time-dependent buckling of embedded straight concrete columns armed with Silicon dioxide($SiO_2$) nano-particles exposed to fire is investigated in the present study for the fire time. The column is simulated mathematically with Timoshenko beam model. The governing mass conservation equations to describe heat and moisture transport in concrete containing free water, water vapor, and dry air in conjunction with the conversion of energy are considered. The characteristics of the equivalent composite are determined using Mori-Tanaka approach. The foundation around the column is simulated with spring and shear layer. Employing nonlinear strains-displacements, energy methods and Hamilton's principal, the governing equations are derived. Differential quadrature method (DQM) is used in order to obtain the critical buckling load and critical buckling time of structure. The influences of volume percent of $SiO_2nano-particles$, geometrical parameters, elastic foundation and concrete porosity are investigated on the time-dependent buckling behaviours of structure. Numerical results indicate that reinforcing the concrete column with $SiO_2nano-particles$, the structure becomes stiffer and the critical buckling load and time increase.

키워드

참고문헌

  1. Bacinskas, D., Kaklauskas, G., Gribniak, V., Sung, W.P. and Shih, M.H. (2012), "Layer model for long-term deflection analysis of cracked reinforced concrete bending members", Mech. Time Depend. Mater., 16(2), 117-127. https://doi.org/10.1007/s11043-011-9138-9
  2. Bajc, U., Saje, M., Planinc, I. and Bratina, S. (2015), "Semianalytical buckling analysis of reinforced concrete columns exposed to fire", Fire Saf. J., 71, 110-122. https://doi.org/10.1016/j.firesaf.2014.11.018
  3. Bratina, S., Cas, B., Saje, M. and Planinc, I. (2005), "Numerical modelling of behaviour of reinforced concrete columns in fire and comparison with Eurocode 2", J. Sol. Struct., 42(21), 5715-5733. https://doi.org/10.1016/j.ijsolstr.2005.03.015
  4. Bratina, S., Saje, M. and Planinc, I. (2007), "The effects of different strain contributions on the response of RC beams in fire", Eng. Struct., 29(3), 418-430. https://doi.org/10.1016/j.engstruct.2006.05.008
  5. Brush, D.O. and Almroth, B.O. (1975), Buckling of Bars, Plates and Shells, McGraw-Hill, New York, U.S.A.
  6. Capua, D.D. and Mari, A.R. (2007), "Nonlinear analysis of reinforced concrete cross-sections exposed to fire", Fire Saf. J., 27, 139-149.
  7. Colin, T., Davie Chris, J. and Bicanic, N. (2006), "Coupled heat and moisture transport in concrete at elevated temperatureseffects of capillary pressure and adsorbed water", Numer. Heat Transf. Part A, 49(8), 733-763. https://doi.org/10.1080/10407780500503854
  8. Franssen, J.M. and Dotreppe, J.C. (2003), "Fire tests and calculation methods for circular concrete columns", Fire Technol., 39(1), 89-97. https://doi.org/10.1023/A:1021783311892
  9. Ghorbanpour Arani, A., Kolahchi, R. and Zarei, M.S. (2015), "Visco-surface-nonlocal piezoelasticity effects on nonlinear dynamic stability of graphene sheets integrated with ZnO sensors and actuators using refined zigzag theory", Compos. Struct., 132, 506-526. https://doi.org/10.1016/j.compstruct.2015.05.065
  10. Hozjan, T., Planinc, I., Saje, M. and Srpcic, S. (2008), "Buckling of restrained steel columns due tofire conditions", Steel Compos. Struct., 8(2), 159-178. https://doi.org/10.12989/scs.2008.8.2.159
  11. Hozjan, T., Saje, M., Srpcic, S. and Planinc, I. (2011), "Fire analysis of steel-concrete composite beam with interlayer slip", Steel Compos. Struct., 89(1), 189-200. https://doi.org/10.1016/j.compstruc.2010.09.004
  12. Jafarian Arani, A. and Kolahchi, R. (2016), "Buckling analysis of embedded concrete columns armed with carbon nanotubes", Comput. Concrete, 17(5), 567-578. https://doi.org/10.12989/cac.2016.17.5.567
  13. Kodur, V., Wang, T.C. and Cheng, F.P. (2004), "Predicting thefire resistance behavior of high strength concrete columns", Cement Concrete Compos., 26(2), 141-153. https://doi.org/10.1016/S0958-9465(03)00089-1
  14. Kolahchi, R., Rabani Bidgoli, M., Beygipoor, G. and Fakhar, M.H. (2015), "A nonlocal nonlinear analysis for buckling in embedded FG-SWCNT-reinforced microplates subjected to magnetic field", J. Mech. Sci. Technol., 29(9), 36695-3677.
  15. Kolahchi, R., Safari, M. and Esmailpour, M. (2016), "Dynamic stability analysis of temperature-dependent functionally graded CNT-reinforced visco-plates resting on orthotropic elastomeric medium", Compos. Struct., 150, 255-265. https://doi.org/10.1016/j.compstruct.2016.05.023
  16. Mori, T. and Tanaka, K. (1973), "Average stress in matrix and average elastic energy of materials with misfitting inclusions", Acta Metall. Mater., 21(5), 571-574. https://doi.org/10.1016/0001-6160(73)90064-3
  17. Rodrigues, J.P.C., Laim, L. and Correia, A.M. (2010), "Behaviour of fiber reinforced concrete columns in fire", Compos. Struct., 92(5), 1263-1268. https://doi.org/10.1016/j.compstruct.2009.10.029
  18. Safari Bilouei, B., Kolahchi, R. and Rabani Bidgoli, M. (2016), "Buckling of concrete columns retrofitted with nano-fiber reinforced polymer (NFRP)", Comput. Concrete, 18(5), 1053-1063. https://doi.org/10.12989/cac.2016.18.5.1053
  19. Shepherd, P. and Burgess, I. (2011), "On the buckling of axially restrained steel columns in fire", Eng. Struct., 33(10), 2832-2838. https://doi.org/10.1016/j.engstruct.2011.06.007
  20. Tan, K.H. and Yao, Y. (2003), "Fire resistance of four-face heated reinforced concrete columns", J. Struct. Eng., 129(9), 1220-1229. https://doi.org/10.1061/(ASCE)0733-9445(2003)129:9(1220)
  21. Wang, W.H, Han, L.H., Tan, Q.H. and Tao, Z. (2016), Tests on the Steel-Concrete Bond Strength in Steel Reinforced Concrete (SRC) Columns After Fire Exposure, Fire The., In press.
  22. Zamanian, M., Kolahchi, R. and Rabani Bidgoli, M. (2016), "Agglomeration effects on the buckling behaviour of embedded concrete columns reinforced with SiO2nano-particles", Wind Struct., 24(1), 43-57. https://doi.org/10.12989/WAS.2017.24.1.043