How do you distinguish between the response spectra with equivalent loads and the response spectra without equivalent loads in RFEM and RSTAB?

Answer

The difference between the equivalent loads and the response spectrum method are the equivalent loads themselves. In the case of the equivalent load method, they are generated at each FE node and recorded in a separate load case.

On the other hand, the response spectrum method calculates the internal forces immediately and displays them as a result. For a seismic analysis, it is therefore recommended to use equivalent loads. There are practically no disadvantages compared to the response spectrum method and can also consider the accidental torsional effect, among other things.

Keywords

Response spectrum Equivalent load Earthquake Seismic analysis

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  • Updated 14 January 2021

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RSTAB Dynamic Analysis
DYNAM Pro - Equivalent Loads 8.xx

Add-on Module

Seismic and static load analysis using the multi-modal response spectrum analysis

Price of First License
580.00 USD
RFEM Dynamic Analysis
RF-DYNAM Pro - Equivalent Loads 5.xx

Add-on Module

Seismic and static load analysis using the multi-modal response spectrum analysis

Price of First License
760.00 USD