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Analytical Study Assessment of a Bridge with Pretensioned Rocking Columns for Rapid Construction

 Analytical Study Assessment of a Bridge with Pretensioned Rocking Columns for Rapid Construction
Author(s): , , , ,
Presented at IABSE Symposium: Engineering the Future, Vancouver, Canada, 21-23 September 2017, published in , pp. 1903-1910
DOI: 10.2749/vancouver.2017.1903
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A two-span, quarter-scale, precast concrete bridge with pretensioned rocking columns was tested on the shaking tables at the University of Nevada, Reno in 2014. The columns were designed with parti...
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Bibliographic Details

Author(s): (University of Nevada Reno, Reno NV, USA)
(University of Washington, Seattle, WA, USA)
(University of Nevada Reno, Reno NV, USA)
(University of Washington, Seattle, WA, USA)
(University of Washington, Seattle, WA, USA)
Medium: conference paper
Language(s): English
Conference: IABSE Symposium: Engineering the Future, Vancouver, Canada, 21-23 September 2017
Published in:
Page(s): 1903-1910 Total no. of pages: 8
Page(s): 1903-1910
Total no. of pages: 8
Year: 2017
DOI: 10.2749/vancouver.2017.1903
Abstract:

A two-span, quarter-scale, precast concrete bridge with pretensioned rocking columns was tested on the shaking tables at the University of Nevada, Reno in 2014. The columns were designed with partially unbonded strands to provide re-centering; locally debonded reinforcing steel to delay bar fracture; and confining steel tubes at their ends to protect the concrete against spalling. The residual drift ratios in the bridge were never larger than 0.4%, even after peak drift ratios more than 12%. The only major damage observed during testing was the fracture of the deformed bar reinforcement, first occurring at a drift ratio of 5.7%. To investigate methods to delay bar fracture in this bridge, analytical models were developed and calibrated using the experimental results. These models suggest that low-cycle fatigue likely caused reinforcement fracture in the tests and fracture could be delayed by using a longer debonded length of the reinforcement.

Keywords:
bridges low cycle fatigue connection precast concrete seismic analytical modelling rapid construction shake-table rocking structures pre-tensioned concrete