Response Spectrum
Add a Response Spectrum node () under Definitions>Variable Utilities in a model component to prepare for response spectrum evaluations in structural simulations. This node serves two purposes:
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It defines participation factor variables, similar to a Participation Factors node. These variables are available for standard result presentation but are also used by the special response spectrum datasets.
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You can generate the model features necessary for computing missing mass correction, a method used in some response spectrum evaluations.
The Settings window contains the following section:
Response Spectrum
You need to access the settings in this node only if you are going to include a missing mass correction in your response spectrum analysis. In this case, a synchronization between the eigenfrequency study and the stationary study used to compute the forces from missing mass is needed.
From the Eigenfrequency study list, choose the study used for computing the eigenfrequencies to be used in the response spectrum evaluation. When the Response Spectrum node has been automatically created through the addition of a Response Spectrum study, the selection will as a default point to the corresponding study.
For creating the additional features needed for including missing mass correction into your response spectrum evaluation, click the Create button. The effect of doing so is:
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A number of load groups are created.
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A number of Gravity nodes are added to all structural mechanics interfaces in the component.
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A new study sequence is added for the stationary analyses needed to compute the missing mass correction.
The Response Spectrum node requires the Structural Mechanics Module.
For more information:
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See Performing a Response Spectrum Analysis in the Structural Mechanics Module User’s Guide for a general overview of how to set up a response spectrum analysis.
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See Modal Participation Factors in the Structural Mechanics Module User’s Guide for a discussion about participation factors.
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See Response Spectrum 2D and Response Spectrum 3D for information about the datasets used for response spectrum evaluation.