Question

If a built-up single laced column is subjected to 1200 kN axially and inclination of the lacing bar is 45° with vertical, then each lacing bar will be designed for an axial force of __________.

• A. 28.23 kN
• B. 42.42 kN
• C. 21.22 kN
• D. 30.00 kN

Answer 1

The correct option is C 21.22 kN

Axial force on lacing bar is given by
$F=\frac{V}{2\sin \theta }$

$\therefore F=\frac{30}{2\sin 45{}^{\circ }}=21.21kN$

Where,
V = 2.5% of axial load on column

$V=\frac{2.5}{100}\times 1200=30kN$