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Structural Concrete - Hassoun

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960 Chapter 23 Review Problems on <strong>Concrete</strong> Building Components<br />

b. Design Beam AC<br />

The shear and bending moment diagram is shown in Figure 23.11<br />

( )<br />

column width<br />

Clear span = L n = L − 2<br />

= 33 − 2 = 31 ft<br />

2<br />

Minimum thickness = L 33 × 32<br />

= = 24.75 in. = 25 in.<br />

16 16<br />

(<br />

d = h − clear cover + 1 )<br />

2 d b = 25 − 2 − 0.5 = 22.5in.<br />

1. Determine the effective flange width b e . The effective flange width is the smallest of:<br />

b e = b w + L 12<br />

= 12 +<br />

33 ∗ 12<br />

12<br />

= 45 in.<br />

b e = b w + 6h f = 12 +(6 ∗ 7) =54 in.<br />

b e = b w + L n 31 ∗ 12<br />

= 12 + = 186 in.<br />

2 2<br />

Therefore, b e = 45 in. (ACI Code, Section 6.3.2.1)<br />

A<br />

B<br />

C<br />

32′<br />

21.84 K<br />

A<br />

B<br />

C<br />

–21.84 K<br />

32′<br />

100.90 K.ft<br />

A<br />

B<br />

C<br />

–21.57 K.ft<br />

–21.57 K.ft<br />

32′<br />

Figure 23.11<br />

Shear and moment diagram for beam AC.

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