Evaluating the fire endurance of concrete slabs reinforced with FRP bars: Considerations for a holistic approach

2007 ◽  
Vol 38 (5-6) ◽  
pp. 547-558 ◽  
Author(s):  
L.A. Bisby ◽  
V.K.R. Kodur
Keyword(s):  
Holistic Approach ◽  
Concrete Slabs ◽  
Fire Endurance ◽  
Frp Bars

Thermal effect on fiber reinforced polymer reinforced concrete slabs

2008 ◽  
Vol 35 (3) ◽  
pp. 312-320 ◽  
Author(s):  
A. Zaidi ◽  
R. Masmoudi
Keyword(s):  
Thermal Effect ◽  
Concrete Cover ◽  
Fiber Reinforced Polymer ◽  
Concrete Slabs ◽  
Fiber Reinforced ◽  
Reinforced Concrete Slabs ◽  
Reinforced Polymer ◽  
Frp Bar ◽  
Frp Bars ◽  
Concrete Interface

The difference between the transverse coefficients of thermal expansion of fiber reinforced polymer (FRP) bars and concrete generates radial pressure at the FRP bar – concrete interface, which induces tensile stresses within the concrete under temperature increase and, eventually, failure of the concrete cover if the confining action of concrete is insufficient. This paper presents the results of an experimental study to investigate the thermal effect on the behaviour of FRP bars and concrete cover, using concrete slab specimens reinforced with glass FRP bars and subjected to thermal loading from –30 to +80 °C. The experimental results show that failure of concrete cover was produced at temperatures varying between +50 and +60 °C for slabs having a ratio of concrete cover thickness to FRP bar diameter (c/db) less than or equal to 1.4. A ratio of c/db greater than or equal to 1.6 seems to be sufficient to avoid splitting failure of concrete cover for concrete slabs subjected to high temperatures up to +80 °C. Also, the first cracks appear in concrete at the FRP bar – concrete interface at temperatures around +40 °C. Comparison between experimental and analytical results in terms of thermal loads and thermal strains is presented.

scholarly journals Numerical parametric studies on the fire endurance of fibre-reinforced-polymer-confined concrete columns

2004 ◽  
Vol 31 (6) ◽  
pp. 1090-1100 ◽  
Author(s):  
L A Bisby ◽  
V KR Kodur ◽  
M F Green
Keyword(s):  
Reinforced Concrete ◽  
Holistic Approach ◽  
Concrete Columns ◽  
Reinforced Concrete Columns ◽  
Reinforced Polymer ◽  
Fire Endurance ◽  
Fibre Reinforced Polymer ◽  
Parametric Studies ◽  
Parking Garages ◽  
Promising Application

Confinement of reinforced concrete columns by circumferential fibre reinforced polymer (FRP) wraps is a promising application of FRP materials for structural strengthening and seismic upgrading of deteriorated or under-strength members. However, if this technique is to be used in buildings, parking garages, and industrial structures, then the ability of FRP materials and FRP-wrapped columns to withstand the effects of fire must be demonstrated and evaluated. This paper presents the results of parametric studies conducted using a previously presented and partially validated numerical fire simulation model to investigate the effects of a number of parameters on the fire behaviour of FRP-wrapped reinforced concrete columns. It is demonstrated that appropriately designed and adequately protected FRP-wrapped reinforced concrete columns are capable of achieving fire endurances equivalent to conventionally reinforced concrete columns. Furthermore, this study also suggests that a holistic approach to the fire design of FRP-wrapped members is required, rather than an approach based on the specific performance of the FRP materials. Design recommendations for the fire-safe design of FRP-wrapped concrete columns are presented and discussed.Key words: reinforced concrete, rehabilitation, strengthening, fibre reinforced polymer, fire endurance, fire insulation, numerical modelling.

Fire Endurance of Simply - Supported Prestressed Concrete Slabs

PCI Journal ◽  
1967 ◽  
Vol 12 (1) ◽  
pp. 37-52 ◽  
Author(s):  
A. H. Gustaferro, ◽  
S. L. Selvaggio
Keyword(s):  
Prestressed Concrete ◽  
Concrete Slabs ◽  
Simply Supported ◽  
Fire Endurance

Bond Models for FRP Bars Anchorage in Concrete Slabs under Fire

2011 ◽  
Vol 82 ◽  
pp. 533-538 ◽  
Author(s):  
Emidio Nigro ◽  
Antonio Bilotta ◽  
Giuseppe Cefarelli ◽  
Gaetano Manfredi ◽  
Edoardo Cosenza
Keyword(s):  
Experimental Tests ◽  
Concrete Cover ◽  
Fiber Reinforced Polymer ◽  
Concrete Slabs ◽  
Concrete Members ◽  
Reinforced Polymer ◽  
In Fire ◽  
External Loads ◽  
Frp Bars ◽  
Concrete Interface

Experimental tests were recently performed to evaluate resistance and deformability of nine concrete slabs reinforced with Fiber Reinforced Polymer (FRP) bars in fire situation by varying (a) external loads in the range of the service loads, (b) concrete cover in the range of usual values (30-50mm), (c) bar end shape (straight or bent) and its length at the end of the concrete members, namely in the zone not directly exposed to fire (250-500mm). Experimental results showed the importance of concrete cover in the zone directly exposed to fire for the protection provided to FRP bars, due to its low thermal conductivity. Moreover, the length of the FRP bars in the zone of slab not directly exposed to fire and its shape at the end of the members was crucial to ensures slab resistance once the resin softening reduced the adhesion at the FRP-concrete interface in the fire exposed zone of slab. In particular the anchorage obtained simply by bending bars at the end of member in a short zone (250mm) allowed attaining a good structural behavior in case of fire equivalent to that showed by slabs characterized by a large anchoring length (500mm). Tests results are briefly compared and discussed in this paper, whereas the behavior of the bar anchorage is carefully examined based on both the results of numerical thermal analysis and the predictions of a bond theoretical model adjusted for fire situation.

scholarly journals Behavior of FRP Bars-Reinforced Concrete Slabs under Temperature and Sustained Load Effects

Polymers ◽  
2014 ◽  
Vol 6 (3) ◽  
pp. 873-889 ◽  
Author(s):  
Hizia Bellakehal ◽  
Ali Zaidi ◽  
Radhouane Masmoudi ◽  
Mohamed Bouhicha
Keyword(s):  
Reinforced Concrete ◽  
Sustained Load ◽  
Concrete Slabs ◽  
Reinforced Concrete Slabs ◽  
Load Effects ◽  
Frp Bars
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