Question

A reinforced concrete beam of 10 m effective span and 1 m effective depth is supported on 500 mm $\times$ 500 mm columns. If the total uniformly distributed load on the beam is 10 MN/m, the design shear force for the beam is

• A. 50 MN
• B. 47.5 MN
• C. 37.5 MN
• D. 43 MN

Answer 1

The correct option is C 37.5 MN

(c)
The shear force should be calculated at critical section i.e. 1 m away from the face of the column. Effective span of beam is to be taken as the clear span plus effective depth of beam or centre to centre spacing of supports whichever is less. The location of critical section

$x=0.25+1=1.25m$

$\therefore$ Design shear force $=\frac{10\times 10}{2}-10\times 1.25$

$=37.5MN$