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Re: Steel truss in cantilever

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Javier,
 
Here's my approach:
 
Each increment of load has its own L.  Calculate Fa for each increment of load at its value of L, using the appropriate value of k [k=2 in your case].  S[f/Fa] < 1.
 
Nels Roselund
Structural Engineer
South San Gabriel, CA
njineer(--nospam--at)att.net