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Vibration Analysis Options

S-Frame presents you with options to control the vibration analysis solution when you select any of up to 9 of the analysis options you see each time you access the analysis type dialog.

The options that include some aspect of dynamic analysis can be grouped as follows:

· Eigenvalue (Vibration) Analysis

· Unstressed Vibration

· P-Delta Stressed Vibration

· Nonlinear Stressed Vibration

· Response Spectrum Analysis

· Unstressed

· P-Delta Stressed

· Nonlinear Stressed

· AND - RSA options that appear when linear static analysis is requested but there are also active RSA cases.

· Linear Dynamic Time History Analysis - when selected this allows you to toggle between options:

· Nodal excitation

· Base Motion

Regardless of which option you choose, it is essential that you have built an appropriate analysis model, which for dynamic analysis includes defining (lump) masses. Essentially you have two fundamental options as regards this mass modeling:

1. Define the lump masses yourself using the options available in the Geometry window.

2. Use the Convert Loads to Masses feature which simply means that you ask S-Frame to create lump masses based on the loads applied in an identified load case or combination.

Note: For a 3D model, only loads in the Z-direction (that is typically the gravity loads) are converted to mass. For more detailed information on the conversion process see Dynamic mass from static load case or load combination.

These options are covered in the various examples in the sections which follow.

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