Keywords
Response spectrum Equivalent load Earthquake Seismic analysis
Links
- Technical Article | Options for Considering Accidental Torsional Actions
- Further Differences Between RF-/DYNAM Pro - Forced Vibrations and RF-/DYNAM Pro - Equivalent Loads
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Knowledge Base Articles
NBC 2015 Modal Response Spectrum Analysis and Base Shear Considerations
The National Building Code of Canada (NBC) 2015 Article 4.1.8.7 provides a clear procedure for earthquake methods of analysis.
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Product Features Articles
Conversion of Lehr's Damping into Rayleigh Damping
Calculation with consideration of a damping ratio (or Lehr's damping) is not possible in the direct time step integrations. Instead, the Rayleigh damping coefficients must be specified by the user.
In technical literature, the given damping ratio for specific construction forms is in many cases only a rough approximation of the real damping ratios. In RF-/DYNAM Pro - Forced Vibrations, it is possible to use the value of damping ratio to determine the Rayleigh damping. This may occur at one or two natural angular frequencies defined by the user.
Frequently Asked Questions (FAQ)
- Which programs can I use to calculate and design power plants?
- I noticed deviations from the map of DIN EN 1998‑1 or DIN 4149 in the online service "<a href="https://www.dlubal.com/en/solutions/online-services/snow-load-wind-speed-and-seismic-load-maps" target="_blank">Geo-Zone Tool: Snow, Wind, and Seismic Zone Maps</a>." Can you tell me which map is current and thus governing?
- I would like to design an aluminum or lightweight structure. Is it possible to use RFEM or RSTAB for this?
- Why do I only obtain the seismic loads calculated in one direction in the case of design with RF‑/DYNAM Pro?
- Are the models and presentations from Info Day 2020 freely available, and can you send them to me?
- During the check in RF‑/DYNAM Pro, I get the message "No natural vibration case or dynamic load case has been selected for the calculation." Why?
- Is it possible to also create a user-defined response spectrum in RF‑/DYNAM Pro?
- How can I enter or read out a response spectrum via the COM interface in DYNAM Pro?
- Are the models and presentations from Info Day 2017 freely available, and can you send them to me?
- RF-/DYNAM Pro - Equivalent Loads includes the result tables "5.8/5.9/5.10 - Equivalent Loads." Which sum is displayed in the case of the "All mode shapes" option?
Customer Projects
Associated Products
RSTAB
Dynamic Analysis
Add-on Module
Seismic and static load analysis using the multi-modal response spectrum analysis
Price of First License
580.00 USD
580.00 USD
RFEM
Dynamic Analysis
Add-on Module
Seismic and static load analysis using the multi-modal response spectrum analysis
Price of First License
760.00 USD
760.00 USD
