Should calculation results obtained from FEM-software be verified by “hand” calculations?
Should calculation results obtained from FEM-software be verified by “hand” calculations?
Definitely yes, as “hand” verification gives a confidence in FEM-software results and helps to avoid significant mistakes. Here is the verifications case one of the recent projects.
5-storey, 3-bays moment-resisting steel frame, carrying horizontal loads, checked for the deflection.
Assumptions, applied for the verification:
- – regular storey’s height;
- – material behaves linearly;
- – no second order effects are considered;
- – all connections are rigid and full-strength.
Actual lateral deformation of the frame consists of:
- shear deformations related to beams;
- shear deformation related to columns (storey-height);
- global bending;
- local bending of columns
“Hand” calculations gives 24.2 mm. FEM-calculations, performed in Dlubal RFEM software gives 25.1 mm. Deviation = 4%
The dominant deformation is shear. This is true for the low frames.
How do you verify your calculations? Please share in comments.
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