42 torsional behaviour a plain concrete beam

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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 longitudinal axis. 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. 3.4-...
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