Page 271 - Handbook of Civil Engineering Calculations, Second Edition
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2.56 REINFORCED AND PRESTRESSED CONCRETE ENGINEERING AND DESIGN
The offset from a reference line through B to the arc BD represents the value of f bw at that
section.
7. Construct the final-stress diagram
Construct Fig. 32b in an analogous manner. The offset from a reference line through B
to
the arc B
D
represents the value of f bw f bs at the given section.
8. Alternatively, construct composite stress diagrams for the top
and bottom fibers
The diagram pertaining to the bottom fiber is shown in Fig. 33. The difference between
the ordinates to DE and AB represents f bi and the difference between the ordinates to FG
and AC represents f bf .
FIGURE 32. Isometric diagrams for half-span.
