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Structural Concrete - Hassoun

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992 Chapter 24 Design and Analysis Flowcharts<br />

Determine compression and tension stress limits at transfer<br />

Determine final stress compression and tension stress limits<br />

Calculate initial service moment stress in the top and bottom of the prestressed girder<br />

Calculate initial service moment stress in the top and bottom of the prestressed girder<br />

Are service<br />

stresses within<br />

stress limits?<br />

Yes<br />

No<br />

Select a different<br />

girder size or<br />

change strand<br />

arrangement<br />

Design the longitudinal steel at top of girder<br />

Calculate factored flexure resistance, M r , at points of maximum moment (S5.7.3.1)<br />

Check the<br />

nominal<br />

capacity against<br />

M u<br />

No<br />

Select a different<br />

girder size or<br />

change strand<br />

arrangement<br />

Yes<br />

Check maximum<br />

and minimum<br />

reinforcement<br />

(S5.7.3.3.2)<br />

No<br />

Select a different<br />

girder size or<br />

change strand<br />

arrangement<br />

Yes<br />

Calculate camber & check live-load deflection<br />

End<br />

Flowchart 24.18<br />

Flexure design.

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