Size Effect on Nominal Strength of Circular Stirrup-Confined RC Columns under Axial Compression: Mesoscale Study
Publication: Journal of Structural Engineering
Volume 146, Issue 3
Abstract
Most previous studies have made great progress in the size effect of concrete materials and several classic size effect laws (SELs) have been proposed. However, there is a lack of size effect laws for RC components including beams, columns, and beam-column joints. The focus of this study is the size effect in RC columns confined by stirrups under axial compression. A three-dimensional mesoscale numerical method for the simulation of the failure of RC columns was established. The numerical results were found in good accordance with the available experimental ones, demonstrating the rationality of the simulation method. The simulation method was then extended to model the size effect of circular RC columns having larger sizes. The main parameter, stirrups ratio, which evaluates the size and interaction effects between the concrete and reinforcement, was examined and analyzed. Furthermore, the influence mechanisms of confinement effect generated by stirrups on the nominal compressive strength were explored. Finally, based on the available classic SEL for concrete materials, a predictive formula was built that can describe the quantitative influence of constraint generated by stirrups on size effect of RC columns under axial compression. For comparison, the validation of the predictive theorical formula with the available test data is presented.
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Acknowledgments
This research was supported by the National Natural Science Foundation of China (Nos. 51822801 and 51421005) and the National Key Basic Research and Development Program of China (Nos. 2018YFC1504302 and 2016YFC0701100). The support is gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 3 • March 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Nov 16, 2018
Accepted: Jun 21, 2019
Published online: Dec 17, 2019
Published in print: Mar 1, 2020
Discussion open until: May 17, 2020
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