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In a reinforced concrete section, the stress at the extreme fibre in compression is 5.80 MPa. The depth of neutral axis in the section is 58 mm and the grade of concrete is M25.
Assuming linear elastic behaviour of the concrete, the effective curvature of the section (in per mm) is
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- 2.0 × 10–6
- 3.0 × 10–6
- 4.0 × 10–6
- 5.0 × 10–6
Correct Option: C
Modules of elasticity, E = 5000 √ fck
= 5000 √25
= 25000 N/mm2
| = | = | |||||
| I | R | y |
Curvature,
| = | ||||
| R | Ey |
| = | E.Xu |
| = | 58 × 25000 |
= 4 × 10–6/mm
