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Using Locally Pre-stressed Reinforcing Bars to Restore the Capacity of Severely Damaged Steel Beams
Assaad Taoum,Hui Jiao,Damien Holloway 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.1
This paper investigates the behaviour of damaged steel beams repaired using locally pre-stressed reinforcing steel bars. Regular reinforcing bars are welded to the beam’s web at both ends and then pretensioned using a manual screw jack to increasethe effectiveness of the repair. Six beams with different bar diameters and levels of pre-stress were repaired and tested underthree-points bending. Results showed that the level of pre-stress controlled the beams’ stiffness, while restoration of theirultimate load-carrying capacity was governed by the bar size. Significantly higher repaired capacities were achieved by thismethod than by other published methods used for the strengthening of steel beams.