Repair of Fire-Damaged Reinforced Concrete Flexural Members: A Review

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.

A Review of Precast Concrete Beam‐to‐Column Connections Subjected to Severe Fire Conditions

“…e steel jacketing prevented concrete spalling while increasing the ultimate load capacity. According to Ma et al [64], the suitable methods for repairing fire-damaged concrete structures are externally bonded reinforcement, near surface-mounted fibre-reinforced polymers, bolted side plating, jacketing with high-performance and ultrahigh-performance concretes or mortars, and replacement of the damaged concrete.…”

“…Externally bonded reinforcement (ii) Fibre-reinforced polymers (iii) Bolted side plating (iv) Jacketing with high-and ultra-high-performance concretes or mortars (v) Damaged concrete replacement Ma et al[64] …”

Flexural Behavior of Fire-Damaged Prefabricated RC Hollow Slabs Strengthened with CFRP versus TRM

“…However, survey data indicated that few RC structures collapsed in or after a fire, and most structures had their residual bearing capacity to keep working [4][5][6][7]. Furthermore, most capacities of fire-damaged structures could be restored to a normal level by proper strengthening methods [8,9]. Therefore, it is essential and urgent to develop efficient strengthening solutions for fire-damaged structures and investigate the structural behavior after that.…”