Research On The Properties Of Fatigue Damage Of Reinforced Concrete Column

Concrete is one of the most important materials in civil engineering. A number of concrete structures are effected by fatigue loads besides by static loads that makes the fatigue damage of concrete structures has become a widespread concern. Therefore, the study of concrete structures under fatigue load get the fatigue damage rule for providing methods and basis to the fatigue design of concrete structures, testing and reinforcement and ensure the safety of concrete structures fatigue. That is a very important issue.Firstly, this paper describes the theory of concrete damage of ultrasonic testing to lay the foundation for the development of experiment and the getting of fatigue damage signals. With the fatigue test of reinforced concrete columns we obtained the waveform, the time and the speed data of the ultrasonic wave.Secondly, introduce computerized tomography to process the damage signal of cross-section of reinforced concrete column and map out concrete changes in the velocity cloud. Analysis the magnitude of velocity change to get the characteristics of fatigue damage of cross-section.Finally, taking db5 wavelet as wavelet basis original signals are dispelled by 5 layer wavelet bundles, and receive 32-dimensional vector of energy proportion. Then constructed 33-dimensional vector about concrete damage with 32-dimensional energy proportion and the time and enter the neural network trained to get part of the damage. Then plus it to damage variable delimited by speed as the fatigue damage variable of reinforced concrete columns to analysis the variation of fatigue damage of reinforced concrete column.