Question

A steel column is to support a factored load of 1200 kN. The column ends are flushed for complete bearing at a section where it is to be spliced as shown in figure. The allowable stress in the splice plate is 240MPa. The thickness (in mm, rounded off to the multiple of 2) of the splice is_____. (Take the width of splice plate is 250 mm)

• A. $6mm$
• B. $10mm$
• C. $4mm$
• D. $8mm$

Answer 1

The correct option is A $6mm$

Since column ends are flushed, hence 50% of load is transfered through the splice and fastenings.

The load on each splice plate
$=\frac{1200\times {10}^3}{4}=300\times {10}^{3}N$

Sectional area of splice plate
$=\frac{300\times {10}^3}{240}N/m{m}^2$

$=1250m{m}^2$.

Thickness of splice plate
$=\frac{1250}{250}=5\approx 6mm$