Question

Which of the following plan views of a gusseted base plate will result in minimum base plate thickness?

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

Plate thickness is gusseted plate base,
$t=c\sqrt{3\omega /{\sigma }_{bs}}$
$c\to$ portion of the base plate acting as a cantilever
$t\to$ thickness of base plate at critical section
$\omega \to$ intensity of pressure from concrete under the slab
${\sigma }_{bs}\to$ the permissible bending stress in slab base
$\begin{array}{cc}\text{Figure}& \text{Cantilever portion (c)}\\ \left(a\right)& \frac{600-140}{2}=230\text{mm}\\ \left(b\right)& 100\text{mm}\\ \left(c\right)& 180\text{mm}\\ \left(d\right)& 160\text{mm}\end{array}$
Thus thickness of base plate shown in figure(b) will be minimum.