Nov 2, 2022 #1 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!
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!
Nov 2, 2022 #2 KootK Structural Joined Oct 16, 2001 Messages 18,690 Location CA OP said: Is it between purlins? Click to expand... Only between purlins that have kickers/fly bracing. Meg said: Or haunches? Click to expand... Those will normally be considered points of torsional bracing. OP said: Is it different for downward and upward loading? Click to expand... 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. Upvote 0 Downvote
OP said: Is it between purlins? Click to expand... Only between purlins that have kickers/fly bracing. Meg said: Or haunches? Click to expand... Those will normally be considered points of torsional bracing. OP said: Is it different for downward and upward loading? Click to expand... 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.