Fiber-Reinforced Polymer-Strengthened/Reinforced Concrete Structures Exposed to Fire: A Review

摘要

Fire resistance of concrete members reinforced or strengthened with fiber-reinforced polymer (FRP) materials is an extremely crucial area that needs to be investigated before implementing FRP composites in buildings and other structures vulnerable to fire. A review on the fire performance of FRP materials and FRP-strengthened/reinforced concrete members is presented. The review includes the mechanical properties of various types of FRP materials at elevated temperatures (based on experimental results). The behavior of bond adhesive epoxies and the bond of FRP reinforcement are investigated under elevated temperature effects. Experimental (fire test) results and numerical studies for unprotected concrete members strengthened or reinforced with FRPs (beams, columns and slabs), including failure patterns, as well as respective results for insulated concrete members, together with the type of insulation materials are also presented. The measured evolution of temperature at distinct locations within the cross section of the tested element and the role of insulation are discussed. Factors that significantly influence the fire resistance of FRP-strengthened or FRP-reinforced systems are investigated and preliminary guidelines for the efficient design of such systems in a fire environment are provided.