[ANALYSIS]     What kind of boundary conditions & elements are available in response spectrum, and time history analysis?

Elements and boundary conditions used when performing an Eigen analysis,
response spectrum analysis, or a time history analysis can be summarized as follows.


1. Eigen Value Analysis / Response Spectrum Analysis

1) Element: Tension only / Hook / Cable, Compression only / Gap elements are replaced with Truss
2) Boundary conditions: General Link such as Tension only / Compression only
Elastic Link are replaced with General Type of Elastic Link




2. Linear time history analysis

1) Element: Same as Eigen analysis / response spectrum analysis
2) Boundary conditions: Force Type and Tension only / Compression only Elastic Link of
General Link are replaced with General Type of Elastic Link





3. Non-linear time history analysis


1) Element: Same as Eigen analysis / response spectrum analysis
2) Boundary conditions: Tension only / Compression only Elastic Link is replaced with
General Type of Elastic Link


Note relationships with eigenvalue analysis and time history analysis can be summarized as follows:

- If you choose Time history analysis method as Modal (mode superposition method),
you must first perform the eigenvalue analysis.

- If the Damping Method for Time History Analysis is Modal or Strain Energy Proportional, you must previously perform the eigenvalues analysis.