Adding TJI Joist Table to Ram SS

Question

I am planning to add a Trus Joist TJI constant shear joist table to Ram SS. I have done similar tables for other joists. To get the deflection close, I modify the moment of inertia by the modular ratio of the Modulus of Elasticity of the joist to steel. I am a little lost trying to use this approach for TJI joists. 
 For example, a 14" TJI-210 has an EI = 462 x 10^6 in^2-lbs. The deflection formula is D = 22.5wL^4/EI + 2.67wL^2/(d x 10^5). I think it would be safe to ignore the 2nd term in that equation and the answer would still be close. The second term changes slightly for wider flanges. 
 w = uniform load (plf), L = span (ft), d = depth of joist (in), D = deflection (in), EI (tabulated) 
 Can someone show me how to derive a good value for a modified Moment of Inertia I for the Ram SS joist table?

Seth Guthrie · Accepted Answer

I missed your tag about constant shear initially. The E that the program uses is 29,000 ksi, so you just need to take your calculated EI value and divide by 29,000 to get the appropriate I value to use in the tables. Keep in mind, that when the program is designing constant shear joists it factors the deflection up times 1.15 per the SJI standard before checking against deflection limits. If your material does not require such an amplification, then that factor should be added to your effective I value. 
 
First time I've ever had anyone ask for most than 2 constant shear tables. Using a combined table might be worth investigating, but it would put a little more work on user selection since the program might pick a different species than you had in mind. 
 
If you are not using Ram Elements, we do wood design there, BTW.