09-16-2009, 02:19 AM
(This post was last modified: 09-16-2009, 06:43 AM by Administrator.)
Time history analysis as a method of implementing performance based design
info:
The current loadings code, NZS4203:1992 (Standards NZ, 1992) permits the use of time history analysis for all structures but the procedures are non-prescriptive and open to varying interpretation, particularly in the selection and scaling of time history records. Scaling of at least three records is required such that “over the period range of interest … the 5% damped spectrum of the earthquake record does not differ significantly from the design spectrum”. In practice, this has usually been interpreted so as to scale records to provide approximately the same average spectrum as the design spectrum.
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