Design light gage truss on the basis of AISI S100/SI-10 & ER-4943P is something you may find helpful to download. Actually the link bellow will offer you ready made spreadsheet required for truss analysis. There are some specifications you should be aware of. There is an intermediate, finite element analysis  which contains shear deformations with E & G equivalent to 29500 ksi & 11300 ksi. Design Light Gage Truss Spreadsheet
The following link will get you a spreadsheet useful for defining joint deflections with finite.

Source.
Download here.
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