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spectrum damping for modal analysis

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capablanca

Structural
Nov 26, 2001
32
Sirs:
It seems that SAP escalates the earthquake spectra for different damping values. If I enter a 5% damping spectra
and due to internal calculations of SAP (for example if I
use material damping) the modal damping of some mode results,say 8%,the program needs to escalate the spectra.
Does somebody knows how the escalation is done? In the SAP
manuals I cannot find this.
If somebody can help on this I would appreciate.Thanks anyway.
Capablanca
 
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