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Repairing of short reinforced concrete corbel by bonding composite material under continuous load

This paper presents an experimental study of repairing of short reinforced concrete corbel by bonding composite material under continued load. The short reinforced concrete corbel usually is used in Civil Engineering and in Building Construction as structure element. This structure is very important because it’s often supported the load of the metal or the reinforced concrete beams (such as on overhead travelling cranes or bridge pile or in construction). In fact, the damage occurring in corbel is due to: the steel corrosion which is at the source of many disorders in reinforced concrete structures, the excessive load, the cracks caused by high vibration and fatigue of the structure, sometimes, by inadequate ultimate strength. The strengthening by bonding composites materials is a good technique to extending the life of the damaged structures. Sometimes the repair of the structure to can be carried out under continuous load. The aim of this experimental research is to show the impact of continuous load and whether it will affect the repair of the structure. For this study five short reinforced concrete corbels were investigated. Two of them are tested under static test (one is strengthened and other one without strengthened) and three (one without strengthened and two strengthened) are tested under dynamic test by cyclic loading. One of specimen was tested under cyclic loading (500 000 cycles) and after appaired the cracks is repaired under continuous load by bonding fiber reinforced fabric. After strengthened the structure is loaded stepwise up to the failure. The results present ultimate load, strain of steel bar, concrete and fabric of repaired short reinforced concrete corbel under dynamic and static applied load. The results of the repaired specimens are compared to the strengthened and the reference structure. The resistance of reinforced concrete corbel depends strongly on surface conditions. The cracking and fracture mechanic mechanisms are described and presented.