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Access the Analysis Cases Data form as follows:
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Before defining analysis cases, define any load cases or functions that will be needed; see the Define Analysis Cases topic for more information.
Analysis Case Name. Accept the default or enter a name for the analysis case being defined. It should be unique among all analysis cases of all types.
Set Def Name button. Click the Set Def Name button to allow the program to automatically create a name based on the analysis type.
Notes - Modify/Show button. Click this button to access the Analysis Case Notes form. Use that form to add Analysis Case Notes to the model file.
Analysis Case Type drop-down list. SAP2000 accommodates many types of analysis cases. Most broadly, analyses are classified as linear or nonlinear, depending on how the structure responds to the loading. Select the primary analysis case type, then select the available analysis types (e.g., Linear or Nonlinear). These options will be different for different analysis case types.
The remaining data on the form depends on the chosen type of analysis case. Click on the appropriate link for the type of case you are defining:
Linear. The most common type of analysis. Loads are applied without dynamical effects.
Nonlinear. Loads are applied without dynamical effects. May be used for cable analysis, pushover analysis, and other types of nonlinear problems.
Nonlinear Staged Construction. The definition of a nonlinear direct-integration time-history analysis case for staged construction.
Multi-Step Static. Linear static analysis for multi-stepped load cases, such as moving loads and wave loads. A separate output step is produced for each step of the given loads.
Modal. Calculation of dynamic modes of the structure using the Eigenvector or Ritz-vector method. Loads are not actually applied, although they can be used to generate Ritz vectors.
Response Spectrum. Statistical calculation of the response caused by acceleration loads. Requires response-spectrum functions.
Time History. Time-varying loads are applied. Requires time-history functions. The solution may be by modal superposition or direct integration methods.
Nonlinear Time History. Time-varying loads are applied. Requires time-history functions. The solution may be by modal superposition or direct integration methods.
Moving Load. Calculation of the most severe response resulting from vehicle live loads moving along lanes on the structure. Uses defined vehicle loads and defined lanes rather than the load cases that are used by other analysis types.
Buckling. Calculation of buckling modes under the application of loads.
Steady State. A steady-state analysis case solves for the response of the structure due to cyclic (harmonic, sinusoidal) loading at one or more frequencies of interest.
Power Spectral Density. A power spectral density analysis case solves for the response of the structure resulting from cyclic (harmonic, sinusoidal) loading over a range of frequencies, and then integrates the resulting spectrum weighted by a probabilistic power-spectral-density function to get a root-mean-square (RMS) expected response.
Example: Definition of a Periodic Time History Analysis is demonstrated in Problem L.
Definition of a Buckling Analysis is demonstrated in Problem O.
Definition of a Modal, Nonlinear, Time History Analysis is demonstrated in Problem N and Problem Q.
Definition of a Modal Analysis is demonstrated in Problem C.
Definition of a Moving Load Analysis is demonstrated in Problem R.
Definition of a Nonlinear, P-Delta Analysis is demonstrated in Problem E and Problem Q.
Definition of a Response Spectrum Analysis is demonstrated in Problem Y and Problem Z.