1011x
004237
2019-12-13

Question

When designing seismic equivalent loads with a Response Spectra Analysis (RSA) in RFEM, how can I apply the modal response parameters Ie/R according to Sect. 12.9.1.2 in the ASCE‑7‑16 to my results?


Answer:

The modal response parameters can be set in the RF‑DYNAM Pro - Equivalent Loads add-on module under the Response Spectra tab. In the Code Parameters table → Type of Spectrum → Modal Response Parameters, the default is set to "No Modification". This setting can be seen in Figure 1.

Changing this to "Force Related" in the drop-down window will divide the response spectra by Ie/R based on Sect. 12.9.1.2 [1]. Additionally, in the Code Parameters table > Coefficients, the Seismic Importance Factor (Ie) and the Response Modification Factor (R) can further be set.


Author

Alex is responsible for customer training, technical support, and continued program development for the North American market.

Links
References
  1. ASCE/SEI 7‑16, Minimum Design Loads and Associated Criteria for Buildings and Other Structures