Evaluation of Fire Endurance of Concrete Slabs Reinforced with Fiber-Reinforced Polymer Bars

Kodur, Venkatesh; Bisby, Luke

doi:10.1061/(asce)0733-9445(2005)131:1(34)

Cited by 73 publications

(38 citation statements)

References 2 publications

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“…A heating ramp phase at 10°C/min was followed by a constant temperature soak phase of either 5, 45, or 90 minutes, and finally a cooling period where the furnace was switched off and the tendon was allowed to cool naturally to ambient conditions. The ramp rate was chosen to be representative of the heating rates which could be expected for prestressing tendons protected by concrete cover and exposed to a standard fire [19]. A 90 minute soak time was selected to be representative of typical fire endurance ratings of required for restrained UPT floor systems with 20 mm of concrete cover.…”

Section: Summary Of Maclean's Experimentsmentioning

confidence: 99%

Transient high-temperature stress relaxation of prestressing tendons in unbonded construction

Gales

Bisby

MacDougall

et al. 2009

Fire Safety Journal

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Unbonded post-tensioned (UPT) flat plate concrete slabs are popular for modern continuous multiple bay floor assemblies due to economic and sustainability benefits (reductions in slab thickness and building selfweight) and structural advantages (decreased deflections over larger spans). Only limited research has been conducted on the performance of UPT flat plate slabs under fire conditions, yet the inherent fire endurance of these systems is sometimes quoted as a benefit of this type of construction. One concern for these structures in fire is that high temperature stress relaxation of the unbonded prestressed reinforcement may cause considerable and irrecoverable prestress loss, with subsequent structural consequences. This paper uses a computational model which has been developed to predict the transient high temperature stress relaxation (i.e., prestress loss) for typical UPT multiple span flat plate slabs in fire, to study the potential prestress relaxation behaviour under various plausible temperature conditions as might occur during exposure to a standard fire. The model is validated using experimental data from relaxation tests performed on locally heated unbonded seven-wire prestressing stand. The initial prestress level, concrete cover to the prestressed reinforcement, and ratio of heated length to overall tendon length are varied to investigate the potential implications for prestress loss, and subsequently for flexural and punching shear capacity. The results highlight the need for particular care in the construction of UPT slabs to ensure adequate concrete cover for structural fire safety.

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Section: Summary Of Maclean's Experimentsmentioning

confidence: 99%

Transient high-temperature stress relaxation of prestressing tendons in unbonded construction

Gales

Bisby

MacDougall

et al. 2009

Fire Safety Journal

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“…Kodur and Bisby [4] studied the behaviour of FRP reinforced concrete slabs in fire through numerical modelling. They discovered significant differences in the behaviour of FRP reinforced compared to steel reinforced concrete slabs.…”

Section: Open Accessmentioning

confidence: 99%

“…Once the distribution of temperatures throughout the slab is known at each time step during fire exposure, the flexural capacity of slab can be calculated using Euler-Bernoulli beam theory. The following assumptions are made in the model: (1) Slabs are exposed to fire from the bottom of the slab only (2) Slabs carry loads in bending in one direction only (one-way slab) (3) Slabs are simply-supported and no axial restraint or axial forces are present (4) The bond of FRP bars to concrete is unaffected by heat, and (5) Plane sections remain plane throughout the analysis.…”

Section: Load Capacity Modelmentioning

confidence: 99%

Numerical Study of FRP Reinforced Concrete Slabs at Elevated Temperature

2014

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Abstract:One-way glass fibre reinforced polymer (GFRP) reinforced concrete slabs at elevated temperatures are investigated through numerical modeling. Serviceability and strength requirements of ACI-440.1R are considered for the design of the slabs. Diagrams to determine fire endurance of slabs by employing "strength domain" failure criterion are presented. Comparisons between the existing "temperature domain" method with the more representative "strength domain" method show that the "temperature domain" method is conservative. Additionally, a method to increase the fire endurance of slabs by placing FRP reinforcement in two layers is investigated numerically. The amount of fire endurance gained by placing FRP in two layers increases as the thickness of slab increases.

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“…An alternative to these tests is the calculation methods, on the basis of the results of fire resistance tests on common structural members; these methods can be used to develop analytical/numerical procedures, which can be used as an alternative to experimental tests. Some of the existing studies related to fire performance of FRP RC include references [6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Parametric finite element analysis of FRP reinforced concrete beams in fire and design guidelines

Rafi

Nadjai

2013

Fire and Materials

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FRP bars are made of innovative materials, and use of these bars in residential and commercial buildings and infrastructure could result in their increased applications. This requires establishment of fire resistance of the FRP bar RC. This paper describes the results of a parametric study that was carried out on hybrid and carbon FRP bar RC beams. The influence of concrete strength and load ratio on the high temperature performance of beams was investigated. The study used finite element modelling and was conducted with the help of numerical models that were calibrated previously by the authors against the data of experimentally tested beams. It was found that the beam strength and stiffness reduce in the same proportion between two consecutive load ratios and are nearly uninfluenced by the concrete strength. The amount of load was found to be a critical factor for the beam thermal resistance. Preliminary guidance for FRP RC beam design in fire situation is provided on the basis of findings of the study. Copyright © 2013 John Wiley & Sons, Ltd.

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Evaluation of Fire Endurance of Concrete Slabs Reinforced with Fiber-Reinforced Polymer Bars

Cited by 73 publications

References 2 publications

Transient high-temperature stress relaxation of prestressing tendons in unbonded construction

Transient high-temperature stress relaxation of prestressing tendons in unbonded construction

Numerical Study of FRP Reinforced Concrete Slabs at Elevated Temperature

Parametric finite element analysis of FRP reinforced concrete beams in fire and design guidelines

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