The rectangular eam of width, 350 mm is having overall depth of 600 mm. The
concrete grade is M30 and the grade of reinforcing steel is Fe415. The tensile
reinforcement is provided by 3-20 mm dia bars. The clear cover is 25 mm. The
effective depth of the beam is equal to :
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Answer:
Characteristics strength of concrete, fck=20 N/mm2
(ii) Characteristics strength of reinforcing steel, fy=415 N/mm2
(iii) Width, b=250 mm
(iv) Effective depth, d=317 mm
(v) Neutral axis factor, xub
d
=
c
c+s
=
0.0035
0.0035+0.0038
=0.48
(vi) Coefficient, Qub
=k1
xub
d
(1 − k2
xub
d
)
=0.36 × 0.48 × (1 − 0.42 × 0.48)
=0.138
(vii) Moment of resistance due to concrete, Mucb
=Qub f ck b d2
=0.138 × 20 × 250 × 3172
=69.395 kNm
Answer : 1. (b) 69.395 kNm
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