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How are damping values used during response-spectrum analysis?
Extended Question: Damping values are defined
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in two sections, including the Definition of Response Spectrum Function
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and
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the Definition of Response Spectrum Cases. How are these damping values
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used?
The Answer: Structural damping is integral to the response-spectrum curve chosen should reflect the damping that is present in the structure being modeled. Note that the damping is inherent in the shape of the response-spectrum curve itself. As part of the Response Spectrum Case definition, you must specify the damping value that was used to generate the response-spectrum curve. During the for analysis. The damping value of this curve should be specified in the Definition of Response Spectrum Cases. During analysis, the response-spectrum curve will be automatically be adjusted from this the specified damping value to the actual damping that present in the model.
Damping in the structure has two effects on Structural damping influences response-spectrum analysis in the following ways:
- It affects the shape of the response-spectrum input curve when modal damping in the system is different than response differs from that of the response-spectrum curve. This generally occurs Generally, this is the case when dampers are present in the modalmodel.
- It affects the amount of statistical coupling between the modes used for certain methods of response-spectrum modal combination methods (CQC, GMC).
See
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