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Fragility curves were generated using non-linear analytical models and a series of compatible records.
Since the sets of compatible records used for the time history approach exhibited a wide range of strong motion durations, settling on a single duration value to use in the IRVT methodology is not obvious.
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Average FAS from a set of spectrum compatible records: The fourth approach to estimate the input FAS was to simply take the average FAS from the 100 compatible records in each set.
Bottom: the target UHRS and the response spectra of the resulting compatible records.
An example of the resulting compatible records and response spectra is presented in Fig. 1.
Figure 2 (bottom) shows the response spectra for 5% damping of the resulting compatible records along with the target spectrum.
Open image in new window Fig. 1 Example of a compatible record (left) and its response spectrum (right) Open image in new window Fig. 2 Top to bottom: pseudo-acceleration response spectra, Fourier amplitude spectrum, and significant duration (D5 75).
There are several methodologies that have been proposed for the generation of spectrum-compatible records, like the adjustment of the power spectrum of a random process or the manipulation in the time or frequency domain of historic records.
That is, spectrum compatible records were developed based on the modification of recorded accelerograms.
It is seen that the characteristics of the seed motions are, in general, retained in the compatible records.
In this work, spectrum compatible records were developed based on the modification of recorded accelerograms to comply with current NRC requirements.
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