Question

An RC structural member rectangular in cross section of width band depth D is subjected to a combined action of bending moment M and torsional moment T. The longitudinal reinforcement shall be designed for a moment M${}_e$ given by

• A. $M_e=M+\frac{T(1+D/b)}{1.7}$
• B. $M_e=M+\frac{T(1-D/b)}{1.7}$
• C. $M_e=\frac{T(1+D/b)}{1.7}$
• D. $M_e=\frac{T(1-b/D)}{1.7}$

Answer 1

The correct option is A $M_e=M+\frac{T(1+D/b)}{1.7}$

The longitudinal reinforcement shall· b.e designed to resist an equivalent bending moment,

$M_e=M+M_q$

where $M_t=T\left(\frac{1+D/b}{1.7}\right)$

$\therefore M_e=M+T\left(\frac{1+D/b}{1.7}\right)$

Equivalent shear,

$V_e=V+1.6T/b$