Plane Stress Element for Web of an I section

[Sapuser]

Dear All,
I have to model an I section beam 11 meters in length by using Sap2000. The beam have three spans and have fixed support at first and last nodes while the in between two supports have spring supports (K = 100000 KN/m).
I have to use Frame element for both the flanges while Plane stress element for the web in one model. The beam is lying on a soil foundation and I have given two spring supports. While in the second model, I have used FRAME elements for both web and flanges. My deflection at both the spring nodes in both the models are almost same, except that in the first model I also have some TRANSLATION. I do not know whether my modelling is correct or not? I am uploading my models if someone can check my PLANE stress element model; especially my RESTRAINT conditions. My moments values are also weird and I can not interpret them.
Thanking you all in advance.

 

[271828]

Which method gives the most accurate results for problems with known solutions?

Test the modeling technique by starting with simple models and progress to more difficult ones: simply supported beam, two-span continuous beam with pins and rollers, etc. Compute the deflections and stresses using classical equations. Include shear deformations in your classical equation calcs.

In the past, I've used thin shells for the web and flanges, and that seemed to work out well.