Abstract
The paper discusses the fast seismic performance assessment of structures using truncated pulse-like ground motion records. It is shown that it is possible to truncate a pulse-like signal using a novel wavelet-based definition that identifies the duration of the predominant velocity pulse. The truncated time-history is still able to efficiently reproduce the increased seismic demand that near-field records typically produce. Substituting the original ground motion with the truncated signal, can significantly accelerate structural analysis and design. The truncated signal is the part of the original accelerogram that coincides with the duration of the predominant pulse, which is identified using a wavelet-based procedure, previously proposed by the authors. Elastic and inelastic response spectra and nonlinear time-history analyses for SDOF (single-degree-of-freedom) systems are first studied. Subsequently a nine-storey steel frame is examined in order to demonstrate the performance of the proposed approach on a multiple-degree-of-freedom system. The proposed approach is found very efficient for pulse-like ground motions, while it is also sufficient for many records that are not characterized as such.
Highlights
Replacing an acceleration time history with an equivalent, “truncated”, signal has many benefits in terms of accelerating the seismic performance assessment and for understanding structural response
The difference in the maximum peak interstorey drift demand between the original and the truncated records is small for ground motions with a pulse indicator pulse index (PI) above the 0.65 threshold
The truncation procedure is efficient for records with a pulse index that exceeds 0.65 which is in agreement with the findings of Kardoutsou et al (2017)
Summary
National Technical University of Athens: Ethniko Metsobio Polytechneio https://orcid.org/0000-00020698-822X Ioannis Ta ampas. Version of Record: A version of this preprint was published at Bulletin of Earthquake Engineering on October 7th, 2021.
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