Research On Damage Identification Of Reinforced Concrete Beams Based On Acoustic Emission Technology And Its Numerical Analysis

People always pay attention to the security and endurance of structure, which is also one of the core contents for engineering design. To monitor and prewar structural damage effectively is the pursue for engineers. Acoustic Emission (AE) technology is a non-destructive test method in lots of methods for damage identification, which uses elastic wave emitting from interior of materials or structures to judge the material or structural changes in the internal damage degree. Because of the real-time, dynamic, convenient and visual feature, AE technology has been drawn broad scholars'more and more attention.Concrete is one of the most common materials in civil engineering, it is well known it can be used in extensive range and important security, therefore, the application of AE technology on concrete material creates a very effective way on the detection of such a mass-using material. Most bridge structures are reinforced concrete structures, so how to use AE technology to detect actual engineering structure, particularly bridge structure, to realize on-line and real-time monitor, it has been becoming a hot research issue.How the results of AE technology detecting reinforced concrete structure, they will have important leading significance to monitor the real structure. To supply a practical method to the real-time healthy monitoring of reinforced concrete bridge, this paper studies the real-time AE characteristics of simply supported reinforced concrete beams during the loading period, monitors the development of crack, the results of experiment prove this method not only judge the crack time by defective trait inside structure, but also determine location of AE origin, and uses the finite element software to numerically simulate the development of crack in the concrete. The results indicate that the numerical simulation results dovetail nicely with the results of AE technology, so verify the AE is accurate and effective, prove it is feasible to monitor reinforced concrete structure by AE technology, and propose the method to identify damage by AE combining with numerical simulation.