Abstract：Based on the energy balance during the process of concrete fracture and the relationship between the acoustic emission and fracture mechanics, the correspondence of acoustic emission and the flexural rigidity of reinforced concrete beam at the stage of crack development was derived. The bending destructive experiments of reinforced concrete beam subjected to dynamic and static load were conducted to verify the proposed equation. The results show that, it is feasible to establish the relation between the acoustic emission parameters and the surplus carrying capacity based on the theory of energy balance. At the stage of crack development, the flexural rigidity of reinforced concrete beam is exactly calculated by acoustic emission parameters acquired from the acoustic emission transducers.
2013, Vol. 32 
