Direction: A singly reinforced rectangular concrete beam has a width of 150 mm and an effective depth of 330 mm. The characteristics compressive strength of concrete is 20 MPa and the characteristics tensile strength of steel is 415 MPa. Adopt the stress block for concrete as given in IS: 456-2000 and take limiting value of depth of neutral axis as 0.48 times the effective depth of the beam.
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The limiting value of the moment of resistance of the beam is kN.m is
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- 0.14
- 0.45
- 45.08
- 156.82
Correct Option: C
Limit values of moment of resistance = F × lever arm
= 0.36.fck .b.xlim (d - 0.42 × 0.48 × d)
= 0.36 × 20 × 150 × 0.48 × 330 (330 – 0.48 × 330 × 0.42)
= 45.07 × 106 Nmm0
= 45.07 kNm
