Adjusting spectral acceleration to a different damping ratio
Adjusting spectral acceleration to a different damping ratio
(OP)
In API 650 Appendix E, a factor of 1.5 is used to adjust the spectral accelerations from 5% to 0.5% damping. No explanation is given why this is valid. What method may be used to establish the spectral acceleration at 0.5% damping given a response spectrum at 5% damping?





RE: Adjusting spectral acceleration to a different damping ratio
here is a paper that evaluates the factors however, and it explains how it is appropriate:
http://peer2.berkeley.edu/ngawest2_wg/wp-content/u...