Ground-motion models for average spectral acceleration in a period range: direct and indirect methods
Average spectral acceleration, AvgSA , is defined as the geometric mean of spectral acceleration values over a range of periods and it is a ground motion intensity measure used for structural response prediction. One of its advantages stands on the assumption that its distribution is computable from...
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Published in | Bulletin of earthquake engineering Vol. 16; no. 1; pp. 45 - 65 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Dordrecht
Springer Netherlands
01.01.2018
Springer Nature B.V Springer Verlag |
Subjects | |
Online Access | Get full text |
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Summary: | Average spectral acceleration,
AvgSA
, is defined as the geometric mean of spectral acceleration values over a range of periods and it is a ground motion intensity measure used for structural response prediction. One of its advantages stands on the assumption that its distribution is computable from the available GMPEs for spectral acceleration, GMPE-
SA
, (called here
indirect
method) without the need for deriving new specific GMPEs for
AvgSA
, GMPE-
AvgSA,
(called here
direct
method). To what extent this assumption is valid, however, has never been verified. As such, we derived an empirical GMPE-
AvgSA
based on RESORCE ground motion dataset and we compared its predicted values with those from a GMPE-
SA
via the indirect approach. As expected, the results show that the indirect approach yields median
AvgSA
estimates that are identical to those of the direct approach. However, the estimates of
AvgSA
variance of the two methods are identical only if both the GMPE-
SA
and their empirical correlation coefficients among different
SA
ordinates are derived from the same record dataset. |
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ISSN: | 1570-761X 1573-1456 |
DOI: | 10.1007/s10518-017-0216-5 |