How do I get RAM Elements to perform a response spectra dynamic analysis?

1. After the geometry of the model is defined, place nodal masses using the Nodes>Masses spreadsheet input,

2. Define a dynamic load case for each X and Z direction,

3. On the Gen>Earthquake acceleration spreadsheet input, enter a scale factor, direction and damping percentage,

4. On the Gen>Response spectrum spreadsheet, enter some response spectrum,

5. Run the analysis and choose the desired combination method (e.g. CQC),

6. Click the View menu>Finite elements toggle,

7. Use the View>Modal deflection results to see the mode shapes or Output>Analysis> Dynamic analysis to get periods and modes info.

For more details, refer to Help>RAM Elements Manual>Chapter 10: Dynamic Seismic Analysis. 

to see example files go to;

C:\ProgramData\Bentley\Engineering\RAM Elements\Data\Samples

and open Dynamic1.etz or Dynamic2.etz.

How can I change the number of modes used in the dynamic analysis?

Click the Process menu>Analyze model toggle, and under Dynamic and Response Spectra change the number of modal shapes to calcualte.

What scale factor should I apply to the response spectrum?

See RAMSS Dynamic Modal Analysis FAQ

See Also

Product TechNotes and FAQs

RAMSS Dynamic Modal Analysis FAQ

STAAD.Pro Response Spectrum FAQ

External Links

Bentley Technical Support KnowledgeBase

Bentley LEARN Server

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