Question:
A steel column in a multi-storied structure carries a load of \(125\,\mathrm{kN}\). It is built up of 2 ISMC 350 channels connected by lacing. The lacing is designed for load of ____
A steel column in a multi-storied structure carries a load of \(125\,\mathrm{kN}\). It is built up of 2 ISMC 350 channels connected by lacing. The lacing is designed for load of ____
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For laced built-up columns,
\[
\boxed{
P_{\text{lacing}}=0.025P
}
\]
i.e., lacing is designed for \(2.5\%\) of the axial load.
Updated On: Jul 23, 2026
- \(125\,\mathrm{kN}\)
- \(12.5\,\mathrm{kN}\)
- \(3.125\,\mathrm{kN}\)
- Zero
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The Correct Option is C
Solution and Explanation
Step 1: Recall the design force for lacing bars.
According to IS 800, lacing bars are designed to resist
\[
\boxed{2.5\%}
\]
of the axial load carried by the built-up column.
Step 2: Calculate the design load. Given, \[ P=125\,\mathrm{kN} \] Design load on lacing, \[ P_l=0.025\times125 =3.125\,\mathrm{kN} \] Hence, \[ \boxed{3.125\,\mathrm{kN}} \] Therefore, \[ \boxed{(C)} \] is the correct answer.
Step 2: Calculate the design load. Given, \[ P=125\,\mathrm{kN} \] Design load on lacing, \[ P_l=0.025\times125 =3.125\,\mathrm{kN} \] Hence, \[ \boxed{3.125\,\mathrm{kN}} \] Therefore, \[ \boxed{(C)} \] is the correct answer.
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