Chapter: Civil : Prestressed Concrete Structures : Design Concepts
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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Civil : Prestressed Concrete Structures : Design Concepts