To perform the seismic static analysis, select Seismic (Equivalent Lateral Force Method) option in the New Case Definition dialog.
You can select the seismic analysis according to the following codes: Australian Code AS 1170-4:2007, EC 8 1998-1:2004, US code ASCE 7-16 or IBC 2012.
Eccentricities on particular directions depend on directions and combinations settings. Mass eccentricity are defined for all floors, as an absolute length value or in relation to the dimension of floor.
To define values of fundamental period, the following methods are available:
- Approximate - values are calculated according to formulas defined by code.
- User defined - values are entered manually by the user.
- Precise - this method generates modal case. Clicking on Modal Analysis Parameters button opens the dialog with settings of the modal analysis.
In the lower part of the dialog Range of Seismic Load and Seismic analysis parameters buttons are located.
The Disregard density parameter allows you to exclude the density of the structure element (ρ=0) during the dynamic analysis of the structure.