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The "Pole Building Design" document by Donald Patterson provides a derivation and a chart of the non-constrained equation. "A" clearly ends up in the denominator. The document has been referenced several times in these forums. Do a search to find the link.

Truss webs in compression are designed w/ an effective length of .8* unbraced length. The TPI standard details the requirements for truss member design. Mark1234, you are going to get your friend w/ the Mitek software into trouble, careful.

Joe, As mentioned by BAretired, you should get the same results from pin-roller and roller-pin. The horizontal deflections/reactions come from the wind loads. If you are only running one load case (wind from the right for example) then you will see different results in the pin-roller...

Sorry, but I do not think my question was understood. I am aware of what W represents, I made calculations above reflecting the correct W. Also, drifting has nothing to do with the min flat snow load. Drifting is a surcharge based on other factors. I am questioning the minimum snow load for...

You may consider having the local truss plant assist you with designing and repairing the trusses. They will be able to model the existing truss for you. Have them build a repair frame (partial truss) that will transfer the loads across the damaged sections. This is also the preferred...

Correction: 1/2" CDX is typical not 3/4" as mentioned above.

To size the plywood you need to know the member forces. 1)Calculate the number of nails needed in each member based on member forces. Multiply the nail values by 0.6 at the heels (Hankinson's formula). 2)Space the nails at 2" o.c. for 2x4 members (2) rows for larger members. This will size...

In ASCE7-05 section 7.3.4 there is a formula for determining minimum flat roof designation for a hip gable roof i.e. (70/W) + 0.5 W is stated to be given in (ft), however, the end units of the equation are not stated. It seems obvious at first glance that the result must be in degrees, since...