Abstract
The mechanical properties of both concrete and steel reinforcement, and the load-bearing capacity of reinforced concrete (RC) structures are well known to be temperature-sensitive, as demonstrated by the severe damage that major fires cause in buildings, followed—in extreme cases—by their collapse. Since in most cases RC structures survive a fire, retrofitting fire-damaged RC members is a hot subject today. In this paper, after a recall on the performance of RC beams and slabs in fire, different repair techniques are considered, among them externally bonded reinforcement, near surface-mounted fiber-reinforced polymers (FRP), bolted side plating, jacketing with high- and ultra-high performance concretes or mortars, and damaged-concrete replacement. Last but not least, the design equations aimed at evaluating the residual load-bearing capacity after repairing are also presented and discussed.
Highlights
The mechanical properties of reinforced concrete (RC) members are greatly affected by the high temperatures developed during a fire
A similar experimental fire-damagedtheT-shaped beams strengthened by carbon fiber reinforced polymer (CFRP) sheets was program was conducted by Williams et al [40]
This paper presented a review of the repair methods for fire-damaged RC flexural members
Summary
The mechanical properties of reinforced concrete (RC) members are greatly affected by the high temperatures developed during a fire. The section enlargement method is simple, sophisticated, and widely used This method can be applied to general concrete structures, such as beam, column, slab, foundation, and other structural members [6]. It is recognized as one of the most cost-effective and convenient methods, the interior space is reduced because of the enlargement of the cross-sectional areas of components. The FRP repair method, involving externally bonded reinforcement (EBR) strengthening and near-surface mounted (NSM) FRP strengthening [6], has been widely used in civil engineering because of its advantages of being light weight, high strength, and corrosion resistant. Premature2019, debonding and peeling failure of the bonded FRP sheets will be inhibited It has obvious advantages for strengthening fire-damaged RC beams
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