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KL/r > 200 for compression member

KL/r > 200 for compression member

KL/r > 200 for compression member

(OP)
I have a V-brace that is an LL3x2x4x3 & receive the slenderness ratio error for compression. What values for r is Risa using? For this particular size I calculate 15'8" max length to satisfy the KL/r >200, but Risa is telling me its 14'-8". Also if I define the member using Euler buckling will risa use kl/r > 300?

Thanks!
 

RE: KL/r > 200 for compression member

Take a look at the I and A values for the member in the member's double-click dialog.  RISA uses r = sqrt (I/A).  

When the member is defined as a tension only member (Euler members are a form of tension only members) then the program will look at L/r>300.  

Both of these checks can be turned off, if desired, by going to Tools - Preferences - Solution and Results.  Then Checking the box which says, "Allow KL/r>200, L/r>300 for LRFD, CAN steel design?"

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