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Structural Concrete - Hassoun

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320 Chapter 8 Design of Deep Beams by the Strut-and-Tie Method<br />

Table 8.1 Element Forces for Truss Shown in Figure 8.23<br />

Member Length P<br />

Identification in. Kip<br />

AB 63 –551.06<br />

BC 40 –919.23<br />

CD 40 –919.23<br />

DE 63 –551.1<br />

AE 162 396.21<br />

BD 72 439.43<br />

No. 5 bar<br />

Strut AB<br />

No. 5 bar<br />

Strut BC<br />

49°<br />

62°<br />

12"<br />

41°<br />

12"<br />

28°<br />

No. 5 bar<br />

No. 5 bar<br />

12" 12"<br />

Figure 8.25<br />

Example 8.4: Horizontal and vertical reinforcement.<br />

6.4"<br />

A<br />

Strut AB<br />

Strut boundary<br />

Strut BC<br />

Tie BD<br />

Tie AE<br />

B<br />

9.9"<br />

41° 28°<br />

Strut boundary<br />

5.6" X<br />

5.3" X<br />

Node A or E<br />

Node B or D<br />

Figure 8.26 Example 8.4: Node zone at A or E and B or D.<br />

Design Ties:<br />

Calculate anchorage length<br />

Development length of No. 9 tension bar with clear spacing not less than 2d b and clear cover not<br />

less than d b . Therefore, according to ACI Code, Section 25.4<br />

Tie AE (Figure 8.26)<br />

ACI Code, Section 25.4.3.2 if cover is 2.5 in. or greater l dh can be factored by 0.7<br />

Tie BD (Figure 8.26)

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