Postfire Performance of Prestressed Concrete Hollow-Core Floor Systems with Edge Beams
Publication: Journal of Structural Engineering
Volume 146, Issue 12
Abstract
This paper presents experimental results and numerical simulation of postfire structural performance of prestressed concrete hollow-core floor slabs with edge beam supports. In total, four tests were carried out, including one test at room temperature and three postfire tests. The three postfire tests all had a load ratio of 0.3 and were exposed to 30, 60, and of the a standard fire before being cooled down and tested at ambient temperature to determine their residual postfire load-carrying capacities. All specimens exhibited flexural failure with rupture of the bottom pretensioned steel rebars. All three heated specimens suffered degradation in initial stiffness and load-carrying capacity compared with the ambient-temperature specimen. However, the residual deflections of the postfire test specimens were within serviceability deflection limits, and the specimens achieved load-carrying capacities greater than the design load-carrying capacity of the undamaged slab. This indicates that the fire-damaged slabs can be reused after superficial repair. This good postfire performance of the slabs can be attributed to restraint effects of the supporting beams. Numerical simulations were performed to further investigate the load-carrying mechanism of prestressed concrete hollow-core floor slabs.
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Acknowledgments
This work was financially supported by Shanghai Science and Technology Commission Standard Program (No. 17DZ2202600), and the Program of Shanghai Subject Chief Scientist (B type) (No. 15XD1522600).
References
Acker, A. V. 2003. “Shear resistance of prestressed hollow core floors exposed to fire.” Struct. Concr. 4 (2): 65–74. https://doi.org/10.1680/stco.2003.4.2.65.
Andersen, N. E., and D. H. Lauridsen. 1999. Hollow core concrete slabs. Hvidovre, Denmark: Danish Institute of Fire Technology.
Bailey, C. G., and T. Lennon. 2008. “Full-scale fire tests on hollowcore floors.” Struct. Eng. 86 (6): 33–39.
Cao, W., and Z. Shen. 1997. “Material properties model of structural steel during whole process of fire.” Eng. Mech. 417–421.
CEN (European Committee for Standardization). 2004a. Eurocode 2: Design of concrete structures—Part 1–1: General rules and rules for buildings. EN1992-1-1. Brussels, Belgium: CEN.
CEN (European Committee for Standardization). 2004b. Eurocode 2: Design of concrete structures—Part 1–2: General rules—Structural fire design. EN1992-1-2. Brussels, Belgium: CEN.
Chang, J., A. H. Buchanan, R. P. Dhakal, and P. J. Moss. 2008. “Hollow-core concrete slabs exposed to fire.” Fire Mater. Int. J. 32 (6): 321–331. https://doi.org/10.1002/fam.970.
Chang, J. J., P. J. Moss, R. P. Dhakal, and A. H. Buchanan. 2009. “Effect of aspect ratio on fire resistance of hollow core concrete floors.” Fire Technol. 46 (1): 201–216. https://doi.org/10.1007/s10694-009-0087-7.
Chen, L., Q. Xu, X. Li, C. Han, Z. Chen, and X. Chen. 2016. “Study on residual flexural performance of precast prestressed hollow core slabs after exposed to fire.” In Proc., 9th Int. Conf. of Structures in Fire. Lancaster, PA: DEStech Publications.
China Architecture and Building Press. 2010. Code for design of concrete structures. GB50010-2010. Beijing: China Architecture and Building Press.
Cooke, G. M. E. 2001. “Behaviour of precast concrete floor slabs exposed to standardised fires.” Fire Saf. J. 36 (5): 459–475. https://doi.org/10.1016/S0379-7112(01)00005-4.
Ehrenbring, H. Z., V. Ortolan, F. Bolina, F. Pacheco, A. M. Gil, and B. F. Tutikian. 2017. “Residual strength evaluation of hollow core slabs of reinforced concrete of an industrial building after fire.” Rev. Materia 22 (3): 1–10. https://doi.org/10.1590/s1517-707620170003.0208.
Han, C., Q. Xu, X. Li, W. Quan, and F. Zhang. 2012. “Experimental research on mechanical behavior of PC hollow-core slab exposed to fire.” J. Build. Struct. 33 (9): 112–118.
ISO. 2014. Fire resistance tests—Elements of building construction—Part 11: Specific requirements for the assessment of fire protection to structural steel elements. ISO834-11:2014. Geneva: ISO.
Jiangsu Province Construction Standard Design Station. 1994. Atlas for 120 prestressed concrete hollow core slabs (cold rolled ribbed steel rebars). G9401. Jiangsu, China: Jiangsu Province Construction Standard Design Station.
Shakya, A. M., and V. K. R. Kodur. 2015. “Response of precast prestressed concrete hollowcore slabs under fire conditions.” Eng. Struct. 87 (Mar): 126–138. https://doi.org/10.1016/j.engstruct.2015.01.018.
Shen, R., L. Feng, and K. Rong. 1991. “Assessment of the mechanical performance of steel reinforcement after fire.” Sichuan Constr. Sci. Res. 17 (2): 5–9.
Tang, Q., and L. Han. 2013. “Post-fire and post-strengthening analysis of steel reinforced concrete columns subjected to fire.” J. Tsinghua Univ. 53 (1): 12–17.
Wu, F., L. Deng, B. Liu, J. Li, S. Chen, and L. Han. 2014. “Experimental study on four-sides simply supported single-direction-prestress double-direction-tendon concrete composite floor slab.” Build. Struct. 44 (5): 6–11.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 12 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Mar 24, 2019
Accepted: Jun 24, 2020
Published online: Sep 21, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 21, 2021
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