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Structural Concrete - Hassoun

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216 Chapter 5 Shear and Diagonal Tension<br />

Figure 5.19<br />

Bending moment diagram (middle) and shear force diagram (bottom).<br />

4. Shear stress at the free end is V u /φbd(M u = 0),<br />

v u =<br />

14, 000<br />

= 196 psi<br />

0.75 × 10 × 9.5<br />

5. At a distance 18 in. from the face of the support, the effective depth is 17.6 in. (from geometry),<br />

V u = 34 − 2.5 × 18<br />

12 = 30.25 K<br />

M u (at 18 in.from support) =14 × 78 + 2.5<br />

12 × (78)2<br />

2<br />

6. At midspan (48 in. from the support),<br />

v u =<br />

d = 14.5in.<br />

= 1726 K ⋅ in.<br />

30.25 × 1000 1726 × 1000 × 0.1042<br />

−<br />

0.75 × 10 × 17.6 0.75 × 10 ×(17.6) 2<br />

= 152 psi<br />

V u = 14 + 10 = 24 K

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