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Unformatted text preview: onal behaviour
• A plain concrete beam subjected to pure torsion
o Torsional moment produces shear stresses, which result in principal tensile stresses inclined at approximately 45° to the
o Diagonal cracks occur when these tensile stresses exceed the tensile strength of the concrete. These cracks will form a spiral
around the members as shown in Fig. 3.4-1. Fig. 3.4-1 Torsional cracks of plain concrete beams
• Torsional reinforcement
o Torsional reinforcement will carry the forces from increasing torsional moment after cracking in the form of closed links and
longitudinal bars by a special truss action, as shown in Fig.
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- Spring '06