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Re: Truss Diagonals in Compression (AASHTO)

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Bill:

In the steel joist industry, where we spend a great deal of time and
money in an effort to save an ounce, effective lengths are from panel
point to panel point for longspan joists and joist girders.  Longspans
with a uniformly loaded top chord use k=0.75, but girders with no
significant loading between panel points use k=1.0.  In your case I
would not consider anything other than panel point to panel point with
k=1.0 unless the peer reviewer is willing to take over, and stamp, the
design.

Phil