Ambient and Forced Vibration Testing of a Reinforced Concrete Building before and after Its Seismic Retrofitting
Publication: Journal of Structural Engineering
Volume 139, Issue 10
Abstract
This paper investigates the effects of seismic retrofitting on the modal characteristics of a 6-story RC building located in Istanbul, Turkey. Ambient vibration surveys were carried out before, during, and after the retrofitting work, which took place between June and December 2010. The building was retrofitted via jacketing of columns, addition of structural walls, and construction of a mat foundation. These studies were complemented with data from forced vibration tests performed with an eccentric-mass shaker after the retrofitting work was completed. During retrofitting, partitions were demolished; as a result, the first modal frequency of the building decreased by 11%, based on the results of the ambient vibration survey. The ambient vibration survey also showed that the modal frequencies after the seismic retrofitting increased by almost 96%. During the forced vibration tests, the building was excited around its modal frequencies using an eccentric-mass shaker. It was found that the modal damping values increased with the amplitude of the excitation force.
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Acknowledgments
The work presented in this manuscript was funded by the National Science Foundation Grant CMMI-0755333, Bogazici University Grant BAP 5343, and in-kind support by Kinemetrics Inc. Any opinions, findings, conclusions, or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the sponsoring agencies. The support of Bogazici University Administration is gratefully acknowledged. The authors also acknowledge the efforts of Ben Ferrero, Fatih Kavarnali, M. Gokhan Kesti, Ekin Ozer, Onur Seren, and Tevfik Terzioglu, who participated in the field tests; and Professor Mustafa Erdik for his guidance throughout the project. Also, the logistical and technical help provided by nees@UCLA (John Wallace, director) is gratefully acknowledged.
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Information
Published In
Journal of Structural Engineering
Volume 139 • Issue 10 • October 2013
Pages: 1741 - 1752
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Apr 15, 2011
Accepted: Jan 12, 2012
Published online: Jan 14, 2012
Published in print: Oct 1, 2013
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