Effective Length for X-Braces

[STR04]

What are most designers using for effective brace lengths for steel X-bracing (CBF)? The telecommunications industry TIA/EIA has reduction values base upon ASCE 10-97 "Design of Latticed Steel Transmission Structures", but what does AISC or IBC say about this issue?

TIA

 

[14159]

They don't say. It's common to do what the tower people do.

DBD

 

[transmissiontowers]

ASCE 10 on p58 Example 7 says that you can consider the cross over point as a brace point if the tension member has 20% of the force in the compression member, so it is load case dependent if you can count on the tension member as a brace point. Otherwise the out of plane buckling is the entire member length.

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