Air Void and Cap Gap Composite Defects of Concrete-Filled Steel-Tube Arch Bridge Transverse Brace
Publication: Journal of Performance of Constructed Facilities
Volume 34, Issue 4
Abstract
Large-diameter concrete-filled steel tube (CFST) arch bridge transverse braces adopt self-compacting concrete to avoid laitance and air void defects. However, several old CFST arch bridges in China use ordinary concrete, whose fluidity before initial setting produces cap gaps at the top of the transverse brace. Furthermore, harsh environments and concrete dry shrinkage enlarge the gaps, producing composite defects. Hence, using ultrasonic scanning, this study performs a scale-model experiment and finite-element analysis to determine the bearing capacity of a serviced CFST arch bridge transverse brace with cap gap and air void defects in the concrete core column under small eccentric axial compression. Parametric analyses were conducted to investigate the influence of the composite defects on the bearing capacity of the transverse brace. A new ultimate strength index of the brace with composite defects was proposed, including a simplified formula for estimating the effects of cap gap and air void defects on the ultimate strength of the CFST arch bridge transverse brace. Thus, this study can provide a strong foundation for the construction of reliable CFST arch bridges.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research was supported by the National Key Research and Development Program of China (No. 2018YFD1100404); Plan of Liaoning Province to revitalize Liaoning talents (No. XLYC1907121); Province Natural Science Foundation of Liaoning, China (No. 20180550442); and Scientific Research Project of Liaoning Provincial Department of Education (No. lnjc201904).
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Published In
Journal of Performance of Constructed Facilities
Volume 34 • Issue 4 • August 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Nov 21, 2019
Accepted: Feb 18, 2020
Published online: May 20, 2020
Published in print: Aug 1, 2020
Discussion open until: Oct 20, 2020
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