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Length of rafter between torsional restraints

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MegKCB

Structural
Joined
Nov 2, 2022
Messages
7
Location
ZA
Hi All
Please could someone help me figure out the effective length (Lz) between torsional restraints of a rafter?
Is it between purlins? Or haunches? Is it different for downward and upward loading? I am beyond confused.
Thanks!
 
OP said:
Is it between purlins?

Only between purlins that have kickers/fly bracing.

Meg said:
Or haunches?

Those will normally be considered points of torsional bracing.

OP said:
Is it different for downward and upward loading?

It's usually the same.

Note that I'm flying a bit blind on this, not having much detail on your structure. So take my advice with a grain of salt.

 
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