You haven’t shown any stresses on the 1” plate, all you have shown is a vertical load of 36000lb in a vertical direction. What you need to do is draw a free body diagram of the 1” plate and label all the forces acting on the plate which should include the reaction forces to 36000lb force where it joins the rod.
“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein
