Damage Detection of Frame Structures Subjected to Earthquake Loading

Abstract eng:
This paper deals with an application of wavelet analysis for damage detection of frame structure subjected to earthquake excitation. Non linear dynamic analysis has been performed and response data at each story are obtained which are used as simulation data. Damage in the frame is introducing by the non linear behaviour of columns and beams. In order the structural members go beyond the elastic limit and start yielding the earthquake excitation was scaled up with appropriate scale factor. Discrete wavelet analysis was performing in order to analyze the simulation response data for each floor because the dynamic behaviour of inelastic structures subjected to an earthquake is a non-stationary process. It was shown that structural damage, due to non linear behaviour of structural elements and the time when this damage occurred, can be clearly detected by spikes in the wavelet details. The effect of noise is taken into account by adding a white Gaussian noise to the simulation response data and discrete wavelet analysis was performing again. It was observed that if the level of details and the order of wavelets are increased, spikes can be detected again and damage would be recognized. Results show the great promise of the wavelet approach for damage detection and structural health monitoring.

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