Experimental Investigations of Loading Rate Effects in Reinforced Concrete Columns
Publication: Journal of Structural Engineering
Volume 138, Issue 8
Abstract
Seismic loading rates can significantly affect the behavior of reinforced concrete (RC) elements. However, few data are available to quantify these effects. Shaking table tests allow the study of loading rate phenomena; however, they suffer from difficulties in assessing causality (direct assessment of causes on effects) and are expensive to conduct. An alternative is to test individual RC elements by directly imparting high-velocity loading protocols. However, multiactuator setups are necessary to achieve seismically representative loading and boundary conditions, which entails particularly challenging control requirements. This investigation makes use of recent advances in real-time testing hardware to study the effects of loading rates on the structural response of lightly confined RC columns. A pioneering test setup in which three actuators are controlled independently at high velocities was used to test a series of columns until axial collapse. The experimental challenges and column behavior are discussed.
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Acknowledgments
The writers would like to thank the State of Colorado for its financial support, the National Science Foundation for its support of the former CU-NEES, and Professor B. Shing, who established the facility. The invaluable assistance of Mr. Casey Champion in building the pedestal and the specimens, of Mr. Etienne Burdet in the interpretation of results, and of Dr. Eric Stauffer for the control scheme is gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 138 • Issue 8 • August 2012
Pages: 1032 - 1041
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Jun 28, 2010
Accepted: Nov 22, 2011
Published online: Nov 24, 2011
Published in print: Aug 1, 2012
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