Question

At what distance from left support of the beam shown below, is the shear force zero?

• A. 1 m
• B. 1.25 m
• C. 1.5 m
• D. 2.5 m

Answer 1

The correct option is C 1.5 m

(c)
Let reaction at the left hand support be V in upward direction.

Now, we have

$\sum Matrighthandsupport=0$

$\Rightarrow V\times 4-15\times 2\times (2+1)=0$

$\Rightarrow V=22.5kN$
Let shear force is zero at a distance x from left hand support, then
22.5 - 15x = 0

$\Rightarrow x=\frac{22.5}{15}=1.5m$