Element damage assessment in semi rigid connected structures using modal domain data
by Bharadwaj Nanda; Damodar Maity; Dipak Kumar Maiti
International Journal of Structural Engineering (IJSTRUCTE), Vol. 11, No. 1, 2021

Abstract: Current vibration-based damage assessment techniques assumes that the joints in a structure behave either perfectly rigid or perfectly flexible. However, joints in the bolted structures are semi-rigid, which means the elements may show rotations to a certain degree on the basis of a fixity factor. In this regard, the present work proposes an alternate solution to conventional inverse damage identification problems by providing due weightage to the joint rigidity. The beam-column joints for this study are made semi-rigid by reducing their end fixity factor. An inverse problem is formulated here using changes in the natural frequencies and mode shape vectors caused due to damages, which is then solved by a unified particle swarm optimisation algorithm. The efficacy of this procedure is demonstrated by conducting a few numerical and experimental studies. The outcomes suggest that the developed procedure is able to locate and quantify damages in a semi-rigidly connected structure with significant accuracy.

Online publication date: Mon, 04-Jan-2021

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