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civil engineering rcc structures design
1. A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n1. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is
(A): 1/2 n1 (1-n1/3) cbd2
(B): all the above
(C): Atft(d-n/3)
(D): bn(fc/2) (d-n/3)
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