Health Monitoring of Connections in Steel Frames Using Wavelet Transform

Document Type : Research Article


Department of Civil Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran


The behavior of steel frames during earthquakes depends on the performance of their connections. In this study, the event of damages in beam-to-column connections of steel frames subjected to the earthquake ground motions is detected, which is related to the number of spikes in wavelet results. The proposed method is based on the detection of abrupt changes in seismic vibration responses by the analysis of velocity responses using wavelet analysis. In order to model damage at the joints, beam-to[1]column connections are considered to be semi-rigid and damage is considered based on the end-fixity factors. In the proposed method, velocity responses for the different damage cases under Kocaeli (1999) and Hollister (1961) earthquakes were analyzed using wavelet transform. The peak values of the details of the response can be expressed in the time of damage occurrence in the beam-to-column connections. For an illustration of the effectiveness of the proposed method, five-story and ten-story steel frames have been studied. The results indicated that the proposed method has been able to identify the damage occurrence in the connections with high accuracy.


Main Subjects

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