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DESIGN OF PRESTRESSED CONCRETE FOR SERVICEABILITY
Raymond Ian Gilbert, Neil Colin Mickleborough
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Abstract
The treatment of cracking and tension stiffening in serviceability calculations for prestressed concrete is not generally understood by practising engineers and has been inappropriately treated in the draft Australian standard for concrete structures. In this report, techniques for the design of prestressed concrete for serviceability are presented. Procedures for the determination of tendon layout and the magnitude of prestress are described. The post-cracking service-load behaviour of a partially prestressed concrete section is also described and analysed. Techniques for calculating flexural rigidity are presented and illustrated by example. The provisions of the new draft standard are criticised and suggestions for improvement are made. In addition, simple procedures for the estimation of both short-term and long-term deflections are also presented. (Author/TRRL)