Dear Mr.Richard AY ,

While I proceed Hot sustained stress check as defined in CII technical paper , I found there is something problem as below,

L1 = W+T+P - Operating
L2 = W+P - Sustained
L3 = L1-L2 - Expansion
L4 = T - Expansion
L5 = L1-L4 - Hot Sustained

When I see the "restraints summary extend" report ;however,the liftoff support node is shown FY=0 and Dy=-0.005 in. in case L5 (hot sustained). How to explain why the displacements is still "negative" without any vertical supporting force ? As we know (OP temp > ambient temp) , if Fy=o is shown at any support node , it means the support node displacement should be larger than zero.I don't know how to treat the new "phenomeon" , please give your advice.

Best regards,