As The Percentage Of Steel Increases

Answer: B. Depth of neutral axis increases

As the percentage of steel increases, depth of neutral axis increases.

Solution

As the percentage of steel increases, the depth of the neutral axis increases. A balanced section will have a larger carrying capacity for tensile stress if the area of steel is increased. The neutral axis must descend in order to counteract or generate equivalent compressive stress or force.

In a rectangular beam segment that is singly reinforced, 

x_u/d = 0.87f_yA_st/0.36f_ckbd

Implies that , x_{u ∝} A_st

Which means as the percentage of steel increases, depth of the neutral axis also increases.

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