Steel and Composite Structures

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The bearing capacity of monolithic composite beams with laminated slab throughout fire process

  • Lyu, Junli (School of Civil Engineering, Shandong Jianzhu University) ;
  • Zhou, Shengnan (School of Civil Engineering, Shandong Jianzhu University) ;
  • Chen, Qichao (School of Civil Engineering, Shandong Jianzhu University) ;
  • Wang, Yong (School of Mechanics & Civil Engineering, China University of Mining & Technology)
  • Received : 2020.09.09
  • Accepted : 2020.12.30
  • Published : 2021.01.10
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Abstract

To investigate the failure form, bending stiffness, and residual bearing capacity of monolithic composite beams with laminated slab throughout the fire process, fire tests of four monolithic composite beams with laminated slab were performed under constant load and temperature increase. Different factors such as post-pouring layer thickness, lap length of the prefabricated bottom slab, and stud spacing were considered in the fire test. The test results demonstrate that, under the same fire time and external load, the post-pouring layer thickness and stud spacing are important parameters that affect the fire resistance of monolithic composite beams with laminated slab. Similarly, the post-pouring layer thickness and stud spacing are the predominant factors affecting the bending stiffness of monolithic composite beams with laminated slab after fire exposure. The failure forms of monolithic composite beams with laminated slab after the fire are approximately the same as those at room temperature. In both cases, the beams underwent bending failure. However, after exposure to the high-temperature fire, cracks appeared earlier in the monolithic composite beams with laminated slab, and both the residual bearing capacity and bending stiffness were reduced by varying degrees. In this test, the bending bearing capacity and ductility of monolithic composite beams with laminated slab after fire exposure were reduced by 23.3% and 55.4%, respectively, compared with those tested at room temperature. Calculation methods for the residual bearing capacity and bending stiffness of monolithic composite beams with laminated slab in and after the fire are proposed, which demonstrated good accuracy.

Keywords

Acknowledgement

The research described here received financial support from the National Natural Science Foundation of China (Project No. 51878398).

References

  1. Agrawal, A. and Kodur, V.K.R., (2020), "A Novel Experimental Approach for Evaluating Residual Capacity of Fire Damaged Concrete Members", Fire Technol., 56(2), 715-735. https://doi.org/10.1007/s10694-019-00900-1.
  2. Akca, A.H. and Ozyurt, N. (2020), "Post-fire mechanical behavior and recovery of structural reinforced concrete beams", Constr. Build. Mater., 253(30), 1-10. https://doi.org/10.1016/j.conbuildmat.2020.119188.
  3. Allan, S.M., Elbakry, H.M.F. and Rabeai, A.G. (2013), "Behavior of one-way reinforced concrete slabs subjected to fire", Alex Eng. J., 52(4), 749-761. https://doi.org/10.1016/j.aej.2013.09.004.
  4. Cooke, G.M.E. (2001), "Behaviour of precast concrete floor slab exposed to standardised fires", Fire Safety J., 36(5), 459-475. https://doi.org/10.1016/S0379-7112(01)00005-4.
  5. El-Zohairy, A., Salim, H., Shaaban, H., Mustafa, S. and El-Shihy, A. (2017), "Experimental and FE parametric study on continuous steel-concrete composite beams strengthened with CFRP laminates", Constr. Build. Mater., 157, 885-898. https://doi.org/10.1016/j.conbuildmat.2017.09.148.
  6. Ellobody, E. (2011), "Nonlinear behaviour of unprotected composite slim floor steel beams exposed to different fire conditions", Thin-Wall. Struct., 49(6), 762-771. https://doi.org/10.1016/j.tws.2011.02.002.
  7. Goncalves, R. (2018), "An improved geometrically exact planar beam finite element for curved steel and steel-concrete composite beams", Thin-Wall. Struct., 123, 492-500. https://doi.org/10.1016/j.tws.2017.11.002.
  8. Henderson, I.E.J., Zhu, X.Q., Uy, B. and Mirza, O. (2015), "Dynamic behaviour of steel-concrete composite beams with different types of shear connectors. Part I: Experimental study", Eng. Struct., 103, 298-307. https://doi.org/10.1016/j.engstruct.2015.08.035.
  9. Hozjan, T., Saje, M., Srpcic, S. and Planinc, I. (2011), "Fire analysis of steel-concrete composite beam with interlayer slip", Compos. Struct., 89(1-2), 189-200. https://doi.org/10.1016/j.compstruc.2010.09.004.
  10. Karam, E.C., Hawileh, R.A., El Maaddawy, T. and Abdalla, J.A. (2017), "Experimental investigations of repair of pre-damaged steel-concrete composite beams using CFRP laminates and mechanical anchors", Thin-Wall. Struct., 112, 107-117. https://doi.org/10.1016/j.tws.2016.12.024.
  11. Katwal, U., Tao, Z. and Hassan, M.K. (2018), "Finite element modelling of steel-concrete composite beams with profiled steel sheeting", J. Constr. Steel Res., 146, 1-15. https://doi.org/10.1016/j.jcsr.2018.03.011.
  12. Khalaf, J. and Huang, Z.H., (2019), "The bond behaviour of reinforced concrete members at elevated temperatures", Fire Safety J., 103, 19-33. https://doi.org/10.1016/j.firesaf.2018.12.002.
  13. Kodur, V., Dwaikat, M. and Raut, N. (2009), "Macroscopic FE model for tracing the fire response of reinforced concrete structures", Eng. Struct., 31(10), 2368-2379. https://doi.org/10.1016/j.engstruct.2009.05.018.
  14. Kodur, V.K.R. and Agrawal, A. (2017), "Effect of temperature induced bond degradation on fire response of reinforced concrete beams", Eng. Struct., 142(1), 98-109. https://doi.org/10.1016/j.engstruct.2017.03.022.
  15. Kodur, V.K.R. and Agrawal, Ankit. (2017), "Effect of temperature induced bond degradation on fire response of reinforced concrete beams", Eng. Struct., 142, 98-109. https://doi.org/10.1016/j.engstruct.2017.03.022.
  16. Kodur, V.K.R. and Dwaikat, M. (2007), "A numerical model for predicting the fire resistance of reinforced concrete beams", Cem. Concr. Res., 30(5), 431-443. https://doi.org/10.1016/j.cemconcomp.2007.08.012.
  17. Kodur, V.K.R. and Naser, M.Z. (2018), "Approach for shear capacity evaluation of fire exposed steel and composite beams", J. Constr. Steel Res., 141, 91-103. https://doi.org/10.1016/j.jcsr.2017.11.011.
  18. Kodur, V.K.R., Naser, M., Pakala, P. and Varma, A. (2012), "Modeling the response of composite beam-slab assemblies exposed to fire", J. Constr. Steel Res., 80, 163-173. https://doi.org/10.1016/j.jcsr.2012.09.005.
  19. Kodur, V.K.R., Naser, M., Pakala, P. and Varma, A. (2013) "Modeling the response of composite beam-slab assemblies exposed to fire", J. Constr. Steel Res., 80, 163-173. https://doi.org/10.1016/j.jcsr.2012.09.005.
  20. Li, G.Q. and Wang, W.Y. (2013) "A simplified approach for firer-esistance design of steel-concrete composite beams", Steel Compos. Struct., 14(3), 295-312. https://doi.org/10.12989/scs.2013.14.3.29.
  21. Lim, O.K., Choi, S., Kang, S., Kwon, M. and Choi, Y. (2019), "Experimental studies on the behaviour of headed shear studs for composite beams in fire", Steel Compos. Struct., 32(6), 743-752. https://doi.org/10.12989/scs.2019.32.6.743.
  22. Liu, X.P., Bradford, M.A. and Ataei, A. (2017), "Flexural performance of innovative sustainable composite steel-concrete beams", Eng. Struct., 130, 282-296. https://doi.org/10.1016/j.engstruct.2016.10.009.
  23. Lou, T.J., Lopes, S.M.R. and Lopes, A.V. (2016), "Numerical modeling of externally prestressed steel-concrete composite beams", J. Struct. Eng., 121, 229-236. https://doi.org/10.1016/j.jcsr.2016.02.008.
  24. Lu, L.M., Yuan, G.G., Shu, Q.J., Huang, Z.H., Zhong, C.S. and Xu, B. (2019), "Bond behaviour between early age concrete and steel bar subjected to cyclic loading after fire", Fire Safety J.,105, 129-143. https://doi.org/10.1016/j.firesaf.2019.02.012.
  25. Mirza, O. and Uy B. (2009), "Behaviour of headed stud shear connectors for composite steel-concrete beams at elevated temperatures", J. Constr. Steel Res., 65(3), 662-674. https://doi.org/10.1016/j.jcsr.2008.03.008.
  26. Naser, M.Z. and Kodur, V.K.R. (2017), "Comparative fire behavior of composite girders under flexural and shear loading", Thin-Wall. Struct., 116, 82-90. https://doi.org/10.1016/j.tws.2017.03.003.
  27. Pathirana, S.W., Uy, B., Mirza, O. and Zhu, X. (2016), "Flexural behaviour of composite steel-concrete beams utilising blind bolt shear connectors", Eng. Struct., 114, 181-194. https://doi.org/10.1016/j.engstruct.2016.01.057.
  28. Song, T.Y., Zhong, T., Razzazzadeh, A., Han, L.H. and Zhou, K. (2017), "Fire performance of blind bolted composite beam to column joints", J. Constr. Steel Res., 132, 29-42. https://doi.org/10.1016/j.jcsr.2017.01.011.
  29. Subhani, M., Al-Ameri, R. and Kabir, M.I. (2018), "Hybrid strengthening of steel-concrete composite beam, part 1: Experimental investigation", J. Constr. Steel Res., 141, 23-25. https://doi.org/10.1016/j.jcsr.2017.11.005.
  30. Xian, Q., Tong, L., Zhou, L. and Chen, Y. (2017), "Experimental investigation on fatigue strength of joints between SRC beams and concrete-filled RHS columns", KSCE J. Civil Eng., 21(5), 1802-1811. https://doi.org/10.1007/s12205-016-0859-9.
  31. Xiong, M.X. and Liew, J.Y.R. (2016), "Mechanical behaviour of ultra-high strength concrete at elevated temperatures and fire resistance of ultra-high strength concrete filled steel tubes", Mater. Des., 104, 414-427. https://doi.org/10.1016/j.matdes.2016.05.050.
  32. Ye, Z.N., Jiang, S.C., Heidarpour, A., Li, Y.C. and Li, G.Q. (2019), "Experimental study on cyclically-damaged steel-concrete composite joints subjected to fire", Steel Compos. Struct., 30(4), 351-364. https://doi.org/10.12989/scs.2019.30.4.351.