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Structural Concrete - Hassoun

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204 Chapter 5 Shear and Diagonal Tension<br />

Figure 5.10<br />

V s<br />

versus S/d for no. 3 stirrups and f yt<br />

= 60 ksi.<br />

Figure 5.11<br />

V s<br />

versus S/d for no. 4 stirrups and f yt<br />

= 60 ksi.<br />

d must be equal to or greater than 22.7 in. to maintain that 3-in. spacing. When V s is equal to<br />

or greater than 52.8 K, then S ≤ d/4.<br />

2. If no. 4 U-stirrups are used, S = d∕2 when V s ≤ 48 k. When V s increases, S/d decreases to<br />

reach 0.16 at V s = 150 K. If the minimum spacing is limited to 3 in., then d ≥ 18.75 in. to<br />

maintain the 3-in. spacing. When V s , then S.<br />

3. If grade 40 U-stirrups are used (f yt = 40 ksi), multiply the S/d values by 2 or, in general,<br />

3<br />

f yt ∕60.

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