Hello,
I am working on applying harmonic dynamic loads in SOFiSTiK and I cannot match the results of a verified benchmark example from SCIA, where the solution is also confirmed by hand calculations.
Model description:
Simply supported beam with overhang, total length 4 m + 1.5 m + 1.5 m.
Cross-section: HEA240, material S235 (EC-EN) and for the simplicity of the example the self weight is 0.01 kN/m³ (else 0).
An electric motor of 500 kg is mounted at the middle of the overhang and the damping ratio is constant and equal to 10%.
Three harmonic load cases at different motor speeds:
| Speed | Frequency | Force Amplitude |
|---|---|---|
| 800 rpm | 13.33 Hz | 4.21 kN |
| 1000 rpm | 16.67 Hz | 6.58 kN |
| 1200 rpm | 20.00 Hz | 9.47 kN |
Despite replicating the model with identical parameters, my displacements in SOFiSTiK do not match the expected results. I suspect the issue may be in how I am defining the harmonic load cases or the dynamic analysis settings (damping, frequency, load type), but I have not been able to identify it.
I am attaching my SOFiSTiK file. Any help or pointers would be very much appreciated.
Thank you!
example 2 2D.dwg (53.3 KB)
example 2 2D.sofistik (488.1 KB)
