Evaluation Method Of Bearing Capacity Of Reinforced Concrete Slab Based On Acoustic Emission Parameters

Reinforced concrete components serve as important parts of modern architectures,and in the process of use,the stress status and damage level are closely associated with personal property and safety.Therefore,in the process of using the structure,the detection of their performances and bearing capacities are very important.In this paper,acoustic emission(AE)detection technology is used to study the acoustic emission signals and parameters of reinforced concrete slabs during static loading in order to establish the quantitative relationship between AE parameters and bearing capacity of reinforced concrete slabs.Based on the qualitative analysis method of AE parameters,the relationship between AE parameters and load change is studied.The experimental results show that the qualitative analysis method based on AE parameters can judge the stress state and key feature points in the loading process.On the basis of the stress-strain relationship model of the damage,the AE signal generated by the crack is measured by the loading test of the reinforced concrete slab.Based on the relationship between the AE signal and the mechanical characteristics of the specimen,the relationship between the AE number and the damage factor is used so as to establish AE parameter and stress-strain relation model.The experimental results show that the stress-strain curve of the concrete is consistent with the corresponding curve established by the number of AE rings.Based on the energy balance of the reinforced concrete structure during the fracture process associated with the coupling relationship between the AE parameters and the fracture mechanics parameters,the relationship between the AE ringing count and the deflection and the crack width during the loading of the specimen is established.On the basis of Stiffness Evaluation Method and Evaluation Method of Flexural Bearing Capacity of Reinforced Concrete Slab.The results show that the method of AE ring counting can be used to evaluate the stiffness of reinforced concrete slabs at different stress stages and the flexural bearing capacity at yield.