Originally Posted by Magus2727
Even if you know vectors and strength of materials and anticipated loading (concentrated or distributed) a manual truss design is laborious.
You will end up needing to know the force and thrust direction in each member, initially and after redesign.
What you propose may be overdesigned, underdesigned or just perfect, this last case being extremely unlikely.
I guess you could test what you already have by putting concentrated loads in different places and measuring deflections, and then rebuilding to not exceed those same deflections, but designing this test procedure may be worse than doing a redesign. And you should test your redesign in any case.
Your first truss picture looks wrong. That downward sloping strut is supposed at right angles to the roof rafter.http://www.google.com/imgres?q=%22ro...9,r:2,s:0,i:79