Dynamics (natural frequencies) - frames (esas.21)
esas.21
Eigen frequencies can be required to verify comfort criteria for buildings, to analyze wind-induced resonance for bridges, to check requirements for sensitive equipment.... The esas.21 module enables you to apply this analysis type to frame structures by performing some few steps:
- Input of dynamic masses
- Selection of desired number of characteristic values
- Review of numerical and graphical results: frequency values, mass participation factors and modal shapes
Highlights |
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Calculation of the characteristic frequencies and modes of the member construction. |
Automatic calculation of the self-weight of the structure. |
Other weights can be entered as local or distributed loads or converted from earlier static calculations into dynamic weight. |
The user sets the desired number of characteristic values. |
For each characteristic value, the characteristic mode will be calculated with the subspace iteration method. |
The results can be represented both numerically and graphically. |
Input of masses
- User input of nodal masses or linear distributed masses
- Automatic generation of masses from the self-weight
- Generation of masses from selected static load cases (converts downward vertical loads into masses)
- Regeneration of masses after modification of selected load cases
Output of results
- Table output of eigen frequencies for each calculated natural mode
- Table output of mass participation factors according to each global direction (X, Y and Z).
- Graphical display of animated eigenmode shapes
02/09/2014