Question

At the limit state of collapse, an RC beam is subjected to flexural moment 200 kN-m, shear force 20 kN and torque 9 kN-m. The beam is 300 mm wide and has a gross depth of 425 mm, with an effective cover of 25 mm. The equivalent nominal shear stress (${\tau }_{ve}$) as calculated by using the design code turns out to be lesser than the design shear strength (${\tau }_c$) of the concrete.


The equivalent flexural moment ($M_{eq}$) for designing the longitudinal tensioned steel is

• A. 187 kN-m
• B. 200 kN-m
• C. 209 kN-m
• D. 213 kN-m

Answer 1

The correct option is D 213 kN-m

Equivalent flexural moment,

$M_{eq}=M+\frac{T}{1.7}(1+\frac{D}{B})$

$=200+\frac{9}{1.7}(1+\frac{0.425}{0.3})$

= 212.79 kN-m