STABILITY OF FLEXURAL CRACKS IN PARTIALLY PRESTRESSED CONCRETE I-BEAMS

PRAKASH DESAYI

Abstract


Assuming non-linear stress-blocks for concrete in compression and tension, variation cf resisting moment of a prestressed concrete beam of I-section has been studied with the gradual penetration of a flexural crack. The range of instability at the crack is examined with respect to the effective prestrain, area of tensioned and non-tensioned reinforcement and the bonding efficiency. For all illustrative case, the minmum reinforcement for a stable crack is determined.

Keywords


Beams (structural); Bonding efficiency; Concrete (partially prestressed); Cracks (flexural); Effective prestrain; Reinforcement (non-tensioned); Stability.

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