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)bn (fc/2) (d - n/3)
B)Atft (d - n/3)
C)½ n1 (1 - n1/3) cbd²
D)All the above

Question

Quizplus · Accepted Answer

The moment of resistance of a singly reinforced beam can be calculated using different approaches, all of which are represented by the options given. Option A represents the moment of resistance based on the dimensions and permissible compressive stress, option B represents it based on the area of tensile reinforcement and permissible tensile stress, and option C represents a more general form involving the critical neutral axis. All these expressions are valid under different contexts or assumptions in the analysis of reinforced concrete beams, hence all the options are correct.

A Singly Reinforced Beam Has Breadth B, Effective Depth D