Design of single angle compression member with restraint as per AISC 360-05.

Hi,

I am designing a single angle member in compression where another lateral brace at mid point is connected to break length.

Please see attachment for configuration.

While calculating KL/r as per clause E5 of AISC 360-05, STAAD always pick Ly assigned length as L.

Do I need to consider Ly as half length as it is restraint at middle, for calculating compression capacity.

Or Ly as full length, since no out of plane restraint is provided for calculating compression capacity.

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