Torsion-bending-shear interaction for reinforced concrete beams

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Keyword: Engineering and Technology, Civil Engineering, Infrastructure Engineering, Teknik och teknologier, Samhällsbyggnadsteknik, Infrastrukturteknik, Structural Engineering, Konstruktionsteknik
Publication year: 1974
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SDG 9 Industry, innovation and infrastructureSDG 11 Sustainable cities and communities
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A rational, simple method is presented for analysis of the torsion-bending-shear interaction at failure for reinforced concrete beams. Equilibrium equations are studied for observed failure mechanisms. Three mechanisms can occur depending on where the concrete compression zone is formed: in the top (mode t), in the bottom (mode b), or in one vertical side (mode s). In modes t and b, the torsion-bending and the shear-bending interaction are governed by second-degree parabolas, whereas the torsion-shear interaction is governed by an ellipse. In mode s, the interaction surface is a cylinder with an elliptic base in the torsion-shear plane.


Lennart Elfgren

Luleå tekniska universitet; Byggkonstruktion och -produktion
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Inge Karlsson

Cementa AB, Malmö
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Anders Losberg

Div. of Concrete Structures, Chalmers Univ. of Tech., Göteborg
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