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Estimating fixed-end rotations of reinforced concrete members at yielding and ultimate

Mergos, P.E. and Kappos, A. J. (2015). Estimating fixed-end rotations of reinforced concrete members at yielding and ultimate. Structural Concrete, 16(4), pp. 537-545. doi: 10.1002/suco.201400067

Abstract

Strain-penetration of the longitudinal reinforcement of reinforced concrete (RC) members in the joints and/or footings results in fixed-end rotations at the member ends. Several experimental studies have shown that fixed-end rotations caused by strain-penetration contribute significantly (up to 50%) to the total displacement capacity of RC members. Hence, accurate determination of these fixed-end rotations at yielding and ultimate limit states becomes of primary importance when defining the structural response of RC members. The purpose of this study is to present the theoretical background and the assumptions behind the most common relationships found in the literature for determining strain-penetration induced fixed-end rotations at yielding and ultimate. Furthermore, new simple relationships are proposed on the basis of realistic and mechanically-based assumptions. Comparisons between the existing and proposed relationships demonstrate the limitations of the former. Finally, the proposed relationships are calibrated against experimental measurements of RC column specimens subjected to cyclic loading with recorded fixed-end rotations due to strain-penetration in the adjacent joints and/or footings.

Publication Type: Article
Additional Information: This is the peer reviewed version of the following article: Mergos, P & Kappos, AJ (2015). Estimating fixed-end rotations of reinforced concrete members at yielding and ultimate. Structural Concrete, which has been published in final form at http://dx.doi.org/10.1002/suco.201400067. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Publisher Keywords: Reinforced concrete; seismic; strain-penetration; fixed-end rotations; anchorage slip; yielding; ultimate
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Mathematics, Computer Science & Engineering > Engineering
URI: http://openaccess.city.ac.uk/id/eprint/8328
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