Question

As per IS:456, for a singly reinforced rectangular section,

• A. $\frac{X_{u,max}}{d}\text{for Fe 415 steel is 0.48}$
• B. $\text{The depth of the centroid of compression is 0.43}{x}_{u,amx}$
• C. $\text{The depth of the rectangular position of the stress block is 0. 38}{x}_{u,amx}$
• D. $\text{The maximum value of lever arm is}d-x_{u,amx}$

Answer 1

The correct option is B $\text{The depth of the centroid of compression is 0.43}{x}_{u,amx}$

(i) Maximum depth of neutral axis for $f_y=250N/m{m}^{2}is0.53dandfor{f}_y=415N/m{m}^{2}is0.48d.$

(ii) The depth of centroid of compression from
maximum strain fiber is
$0.42x_{u,max}$

(iii) $\text{The depth of rectangular block is}\frac{3}{7}{x}_{u,max}=0.43x_{u,max}$

(iv) $\text{The maximum value of lever arm is}d-0.42x_{u,max}$