Column Brace

[531234]

I am designing a 7.0 m two storey tall HSS column and I want to brace it with the bottom chord of the strut joist at mid height to reduce effective length. My question is how do you calculate for the axial load induced in the bottom chord of the strut joist?

 

[rowingengineer]

The braces is generally designed for a capacity of 2% - 2.5% of the force resisted by the compression portion of the column.

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[TDIengineer]

Refer to AISC 360-05, Appendix 6. For Columns, 6.2.2 indicates => Nodal Bracing: Pbr = 0.01Pr.

 

[structSU10]

You also have to make sure it is stiff enough to act as a brace too. Appendix 6 is where you need to go. The brace force can also be reduced per the commentary of appendix 6 if the brace force is larger than that required.

 

[johnbridge231]

Don't forget to check the drifts under the horizontal loads at the end.

Regards

Analysis and Design of arbitrary cross sections
Reinforcement design to all major codes
Moment Curvature analysis

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