Hello there; First, remove the purlins from the analysis model. The attached pictures will help. Then increase the material class. If S355 IPN 160 tension rods are defined, it is sufficient for strength, but it does not save due to deflection. If you model the tension rod, you have to make a one-step calculation by accepting the tension rods as a support for the deflection. It is currently missing in the program, but the necessary work will be done. However, the main issue you mentioned is that IPN 120 is sufficient, it does not seem possible in capacity calculation. There is a serious slope on your roof, so there is an increase in the load on your purlins due to the slope. Recovery of IPN 120 seems unlikely with this geometry and loads. Snow load, pavement unit weight and wind load applied to the pavement by the program in accordance with TS 498 must be the same in the model you mentioned. Programmatically, there is no problem with loads and staff capacities. Strong Axis: Mn= Fy*Z3 Mn=24000*135.735*10^(-6)= 3.2576 tfm Mc= Mn/1.67 = 3.2576/1.67= 1.95 tfm Weakness: Mn=Fy*Z2<= 1.6*Fy*S2 Mn= 24000*24.733*10^(-6)<= 1.6*24000*14.708*10^(-6) Mn= 0.59356<= 0.564 Mn= 0.59356 Mc= 0.59356/1.67 =0.355 The values for the material class of these values are S 235 and lovers You can see that it is compatible with the case of IPN 160. In short, as mentioned, it does not seem possible with AISC 360-10 to be sufficient for you in your structure with IPN 120 S235 material. TS 648, on the other hand, causes higher sections to be used in general compared to AISC 360-10. Therefore, I think that for IPN 120 to be sufficient, the snow and wind loads should be quite low. However, if you have the other model, you can send it for comparison. Necessary investigation will be done. 2) Hall macro is a tool created for fast modelling. After the intervention on the general geometry of the building and sections, the detail work is done after exiting the hall command. It is similar to the fringe. It is possible to quickly create on the 3D screen. We will try to help you if you have any problems. Good work.