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. in the ASCE 7-16 to my results?


The modal response parameters can be set in the RF-DYNAM PRO - Equivalent Forces 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. [1]. Additionally, in the Code Parameters table > Coefficients, the Seismic Importance Factor (Ie) and the Response Modification Factor (R) can further be set.

Figure 01 - RF-Dynam Pro - Equivalent loads add-on module


ASCE 7 Seismic equivalent RSA Modal Response


[1]   ASCE/SEI 7‑16, Minimum Design Loads and Associated Criteria for Buildings and Other Structures


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