Stress and strain of cracked sections - Concrete Structures: Stresses and Deformations - page 234

Example 7.1 Cracked T section subjected to bending
The T section shown in Fig. 7.7(a) is subjected to a bending moment of
1000 kN-m (8850 kip-in). It is required to nd the stress and strain dis-

tributions ignoring the concrete in tension. E

fi

ects of creep and shrink-
age are not considered in this example. The cross-section dimensions
are indicated in Fig. 7.7(a); E c

ff

= 30 GPa (4350 ksi); E s = 200 GPa

(29 000 ksi).

Figure 7.7 Strain and stress distributions in a fully cracked reinforced concrete
section (Examples 7.1 and 7.2): (a) cross-section dimensions; (b) effective
area, strain and stress due to bending (Example 7.1); (c) effective area,
strain and stress due to bending and normal force (Example 7.2).