Long-Term Experimental Study on Prestressed Steel–Concrete Composite Continuous Box Beams
Publication: Journal of Bridge Engineering
Volume 23, Issue 9
Abstract
A long-term load test of 420 days was performed on three prestressed steel–concrete composite continuous box beams (non-prestressed, partly prestressed, and fully prestressed) to investigate the combined effects of sustained load, shrinkage, creep, and prestressing. Several time-varying parameters, such as deflection, concrete strain, prestressing force, support reaction, and relative slippage between the concrete slab and the steel box beam, were monitored in the test. The long-term performance of the prestressed beams that was developed using a special law increased and decreased the support reactions at the middle and end piers over time, respectively, due to the distinct configuration of prestressed strands (i.e., installation was only at the negative moment area). The growth rate of the deflection of the prestressed beams was slightly greater than that of the deflection of the non-prestressed beam. Moreover, cracking at the negative moment region significantly accelerated the development of the relative slippage of the non-prestressed beam. A calculation model of long-term deflection based on classical theories was proposed to theoretically analyze the measured data and provide valuable insights for future research.
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Acknowledgments
This research was funded by the National Natural Science Foundation of China (Grant 51551801) and the Natural Science Foundation of Hunan Province (Grant 14JJ4062).
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Published In
Journal of Bridge Engineering
Volume 23 • Issue 9 • September 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Aug 14, 2017
Accepted: Mar 8, 2018
Published online: Jul 13, 2018
Published in print: Sep 1, 2018
Discussion open until: Dec 13, 2018
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