Earthquake (Seismic) Loading

The following two modules are available for seismic load evaluation.

FS-Seismic generates loading due to earthquake motion in accordance with the UBC and other similar national codes using the static lateral-force procedure.

• Load Case/Mass Case Conversion - Standard Load cases can be converted to Mass Definition Cases by using a mass conversion constant.
• Multiple Mass Cases - Any number of mass definition cases may be used to create the generated load cases.
• Directional Loading - The earthquake motion may be applied in any direction
• Lateral Force - Vertical Distribution - Applies the lateral force vertical distribution in accordance with NBC including the Concentrated Top force.
• Fundamental Period Evaluation - Evaluates the fundamental period using the Raleigh-Ritz method. Simple alternative option to using FS-Frequency .
• Standard Load/Result Cases - The load case created can be pre-processed and post-processed like any other load case since they not RMS type cases. Can be combined with other cases for P-Delta analysis.

FS-Dynamic. The Seismic Response module evaluates earthquake loading using the normal mode Response Spectra Analysis method.

• Response Spectra Curves - NBC, Eurocode, API and user defined curves.
• Multiple Mass Cases - Any number of mass definition cases may be used to create the frequency cases. Standard Load cases can be converted to Mass Definition Cases by using a mass conversion constant.
• Directional Loading - The earthquake motion may be applied in any principal direction and simultaneously in the 6 degrees of freedom.
• Rotational Motion - Rotational base motion in accordance with Eurocode 8.
• Mass Participation - Mass participation evaluated for all included modes.
• Standard Result Cases - The load cases created can be post-processed like any other load case.