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Structural Engineering and Mechanics
  Volume 75, Number 3, August10 2020, pages 401-414

Multi-potential capacity for reinforced concrete members under pure torsion
Hyunjin Ju, Sun-Jin Han, Kang Su Kim, Alfred Strauss and Wei Wu

    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.
Key Words
    multi-potential capacity; failure criteria; reinforced concrete; torsion; strength model
Hyunjin Ju, Alfred Strauss and Wei Wu: Department of Civil Engineering and Natural Hazards, University of Natural Resources and Life Sciences
Feistmantelstraße 4, 1180 Vienna, Austria
Sun-Jin Han, Kang Su Kim: Department of Architectural Engineering, University of Seoul,
163 Seoulsiripdae-ro, Dongdaemun-gu, Seoul 02504, Republic of Korea

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