Seed Record Selection for Spectral Matching with RSPMatch2005

Abstract eng:
The use of spectral-matching software, such as RSPMatch2005, allows the engineer to alter seed ground motions in the time domain to provide a very close match of a target response spectrum. Compared to the use of real recorded ground motions, a smaller number of spectrally-matched records can reliably be used, as the variability is less. A set of criteria for selecting seed motions for RSPMatch2005 is presented, in which initial spectral shape is considered to be of primary importance, and other ground motion characteristics are used to filter the initial database. Rather than using earthquake magnitude bounds as a proxy for ground motion duration, as recommended by other authors, we suggest filtering explicitly on duration. For structures with a long fundamental period, the frequency content of the input motion is also very important, to avoid excessive noise at periods of interest in the original seed record, and excessive manipulation of the record in the spectral matching. A Matlab program which automates the selection criteria and provides a front-end for RSPMatch2005 is also presented.

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