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Structural Concrete - Hassoun

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18.3 Examples 717<br />

1 no. 3 / step<br />

No. 3 @ 12″<br />

No. 4 @ 6″<br />

No. 4 @ 12″<br />

Figure 18.19<br />

(Continued)<br />

3. Calculate the maximum bending moment and steel reinforcement (Fig. 18.19d):<br />

a. The moment at midspan is<br />

( ) 17.2<br />

M u = 2.22 −(0.157 × 5)(6.1)−(0.400) (3.6)2 = 11.71K ⋅ ft<br />

2<br />

2<br />

( )<br />

Let d = 8.0 − 0.75 (concrete cover)−0.25 1 bar diameter = 7.0in.<br />

2

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