Select a single tension member of A36 steel to resist a dead load of 50 kips a live load of 100 kips and a wind load of 45 kips the member is to be connected to an adequate gusset plate with two lines...

The structure shown below is a typical interior frame of a proposed roof deck addition to the Albuquerque Sunport.
Your task is to design members AD and EF.
For analysis purposes, assume that all joints are hinged.
1) Assuming the proposed deck weigh 35 PSF, determine the force in EF due to dead load.
Ans. Given data deck wt = 35psf,
Intensity of the load = 35 * 1230 = 43.05
2) Determine the force in EF due to (20PSF) snow load, assumed uniformly distributed over member BCDE.
Ans. =
3) Determine the maximum force in EF due to(20 PSF, reducible) roof live load.(Note that partial roof live load placement produces maximum force in member EF)
Ans .
4) Determine the minimum force in EF due to(20PSF, reducible) roof live load.
Ans.
5) Assuming the force in EF due to wind load is neglible, find the maximum and minimum ultimate axial force in EF.
Ans. UDL = 20PSF = 1.2 * 0.02kips = 0.024kips
LL = 1.6*100 =160kips
Total load =...