Unified Softened Membrane Model for Torsion in Hollow and Solid Reinforced Concrete Members: Modeling Precracking and Postcracking Behavior
Publication: Journal of Structural Engineering
Volume 141, Issue 10
Abstract
The softened membrane model for torsion (SMMT) was the first rational theory to incorporate the precracking and postcracking torsional behavior of solid RC members. A series of theoretical and experimental investigations were conducted in Taiwan to extend the SMMT to hollow RC members. This paper proposes a generalized SMMT based on the results of these investigations, determines the constitutive relationships of concrete for thin- and thick-walled hollow RC members, and develops a unified SMMT theory for hollow and solid RC members. The proposed SMMT for hollow RC members (SMMT-H) is also employed to derive a rational and formula for such members, completing a unified set of noniterative rational formulas for both hollow and solid RC members. In the experiment, the proposed SMMT-H analyzed the torsional responses of the specimens reasonably well, and predicted the cracking points and precracking torque-twist curves almost perfectly. The proposed rational formula for hollow RC members, which accurately predicted the and of the specimens, is an almost-perfect simplification of the SMMT-H in terms of and . A numerical example illustrating the simple application of this formula is presented.
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Acknowledgments
This research was funded by the National Science Council, Taiwan, through Grants NSC100-2221-E-260-022 and NSC101-2221-E-260-019. The author gratefully acknowledges the assistance of Y.-T. Chen, H.-H. Chang, Y.-L. Lai, J.-C. Lin and Y.-R. Cai, former graduate students at National Chi Nan University and National Kaohsiung University of Applied Sciences, Taiwan.
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Published In
Journal of Structural Engineering
Volume 141 • Issue 10 • October 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Apr 4, 2014
Accepted: Oct 29, 2014
Published online: Dec 24, 2014
Discussion open until: May 24, 2015
Published in print: Oct 1, 2015
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