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http://dx.doi.org/10.12989/sem.2020.75.3.401

Multi-potential capacity for reinforced concrete members under pure torsion  

Ju, Hyunjin (Department of Civil Engineering and Natural Hazards, University of Natural Resources and Life Sciences)
Han, Sun-Jin (Department of Architectural Engineering, University of Seoul)
Kim, Kang Su (Department of Architectural Engineering, University of Seoul)
Strauss, Alfred (Department of Civil Engineering and Natural Hazards, University of Natural Resources and Life Sciences)
Wu, Wei (Department of Civil Engineering and Natural Hazards, University of Natural Resources and Life Sciences)
Publication Information
Structural Engineering and Mechanics / v.75, no.3, 2020 , pp. 401-414 More about this Journal
Abstract
Unlike the existing truss models for shear and torsion analysis, in this study, the torsional capacities of reinforced concrete (RC) members were estimated by introducing multi-potential capacity criteria that considered the aggregate interlock, concrete crushing, and spalling of concrete cover. The smeared truss model based on the fixed-angle theory was utilized to obtain the torsional behavior of reinforced concrete member, and the multi-potential capacity criteria were then applied to draw the capacity of the member. In addition, to avoid any iterative calculation in the existing torsional behavior model, a simple strength model was suggested that considers key variables, such as the effective thickness of torsional member, principal stress angle, and strain effect that reduces the resistance of concrete due to large longitudinal tensile strain. The proposed multi-potential capacity concept and the simple strength model were verified by comparing with test results collected from the literature. The study found that the multi-potential capacity could estimate in a rational manner not only the torsional strength but also the failure mode of RC members subjected to torsional moment, by reflecting the reinforcing index in both transverse and longitudinal directions, as well as the sectional and material properties of RC members.
Keywords
multi-potential capacity; failure criteria; reinforced concrete; torsion; strength model;
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Times Cited By KSCI : 3  (Citation Analysis)
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