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Structural Concrete - Hassoun

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Review Problems on <strong>Concrete</strong> Building Components 969<br />

Therefore, use four no. 4 dowels extending 9.5 in. into column and footing. Note that l dc<br />

is less than d of 13.5 in., which is adequate.<br />

8. The development length of main bars in the footing for no. 4 bars is l d = 19d b = 9.5 in. (refer<br />

to Chapter 7), provided l d = L − c − 3in. = 15 in.<br />

2 2<br />

Details of the footing are shown in Figure 23.16.<br />

12″<br />

One-way<br />

shear section<br />

d<br />

9.5″<br />

18″<br />

4 no. 4 dowel bars<br />

3″, Typ<br />

4.5″<br />

11 No. 4 bars each direction<br />

(a)<br />

d/2 d/2<br />

4′ 0″<br />

c + d<br />

4′ 0″<br />

(b)<br />

Figure 23.16<br />

Footing details

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