Theoretical Model for Ultimate Moment Capacity of RC Beams Strengthened by Unbonded Reinforcement

摘要

The paper presents a theoretical model for ultimate moment capacity of simply supported reinforced concrete beams by way of retrofitting external unbonded ordinary reinforcement. The advantage of this strengthening technique developed by the author in late 1990s lies in its simplicity and speed in installation along with no special and/or additional skills required for installation. The paper provides the general description of the behaviour along with effect of various parameters supported by a theoretical model to calculate the ultimate moment capacity of the retrofitted beams. The theoretical model has been validated through 22 tested specimens having varying parameters, and has been shown to be capable of predicting the ultimate moment capacities of retrofitted beams with sufficient accuracy.