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design built up column 9m long to carry factor axial comp load 1100kN column is restrain in position but not in direction at both end design the column with connecting system as batten bolted sys used
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two channel back to back * talce steel fe 410

Given

Pu=1100 kN

=1100×103N

leff=KL

=1×9000(both end hinged)

Step I Pu=Area fcd

1100×103=Area150 Assume fcd=150

Area=733.33mm2

Area of each channel =7333.3302=3666.67mm2

provide ISMC 300

Aprov =4564mm2

Total provide=2×4564

=9128mm2

γxx=118.1mm

λact=9000118.1

λact=76.20

λe=1.1×λact

=1.1×76.20

=λe=83.83

80 …

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