Identification of Dynamic Parameters of a Precast Beam System by Vibration Recording
DOI:
https://doi.org/10.70567/mc.v42.ocsid8441Keywords:
Structural dynamics, System identification, Physical model, Dynamic parametersAbstract
In tests to identify the dynamic parameters of structures, it is generally necessary to determine natural frequencies and detailed mode shapes using a limited number of sensors. One strategy is to implement multiple measurement configurations, each covering a portion of the structure. The mode shapes identified in each configuration are subsequently assembled to obtain the vibration modes of the entire structure. In this work, a 16-m-span precast concrete beam excited by controlled impacts is studied, recording the acceleration over time during the free vibration phase. Measurements are made with three accelerometers. Dynamic properties are identified using time- and frequency-domain methods. The components of each measurement configuration are subsequently assembled, obtaining the mode shapes of the entire structure. This work discusses the identified mode shapes and random combinations between different impacts, comparing them with the MAC index.
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