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Chapter: Civil - Prestressed Concrete Structures - Design Concepts

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Elastic Design for flexure

Elastic Design for flexure
Civil - Prestressed Concrete Structures - Design Concepts

Elastic Design for flexure

Derivations



Max. pre-stressing force is limited by

1.     Tension at top - f tt during transfer - Eq.1

2.     Min. Comp stress at bottom - f tw during working load - Eq.4

Therefore from Eq.1 and Eq.2 and taking




When MG is large as will be the case for long span and/or heavy girders, the computed eccentricity e from Eq.10, may fall below the bottom of the beam. In that case, the e available is worked out and Fi is increased suitably.

Fi for know eccentricity e working load is:



 

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