Shake Table Studies and Analysis of a PT-UHPC Bridge Column with Pocket Connection
Publication: Journal of Structural Engineering
Volume 144, Issue 4
Abstract
This study conducts shake table studies and analysis of a large-scale novel posttensioned (PT) precast bridge column connected to a precast footing with a pocket connection. The primary objective is to develop a resilient square precast bridge column with minimal residual lateral displacement and plastic hinge damage when subjected to strong earthquakes. Another objective is to evaluate a column-footing pocket connection. The column is posttensioned with unbonded carbon fiber–reinforced polymer (CFRP) tendons to eliminate permanent drifts. To mitigate seismic damage, ultra-high performance concrete (UHPC) is used in the plastic hinge zone of the column. The column model is subjected to the 1994 Northridge-Rinaldi earthquake record with increasing amplitudes until failure. Experimental results show that the drift ratio and displacement ductility capacity of the column are 6.9 and 13.8%, respectively, and the residual displacement is negligible. Furthermore, the pocket connection is effective in forming the plastic hinge in the column with no connection damage. Another finding of the study is that available fiber element models lead to close correlation between the measured and calculated responses.
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Acknowledgments
This study was conducted at the University of Nevada, Reno, with M. Saiidi as the principal investigator (PI) and A. Itani as the co-PI. The project was supported by the U.S. Department of Transportation contract no. DTRT13-GUTC41 through the Accelerated Bridge Construction University Transportation Center (ABC-UTC) with Florida International University (lead), the Iowa State University, and the University of Nevada (UNR). The authors thank Lafarge North America for donating UHPC material, Tokyo Rope for providing CFRP tendons, NDOT for partial support of the project, and UNR lab staff for conducting the experiments.
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Information
Published In
Journal of Structural Engineering
Volume 144 • Issue 4 • April 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Dec 15, 2016
Accepted: Sep 26, 2017
Published online: Feb 7, 2018
Published in print: Apr 1, 2018
Discussion open until: Jul 7, 2018
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