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Significance of Non-Stationary Characteristics of Ground-Motion on Structural Damage: Shaking Table Study

Research output: Contribution to journalArticle

Original languageEnglish
Number of pages23
JournalBulletin of Earthquake Engineering
Early online date13 Jun 2019
DOIs
DateSubmitted - May 2018
DateAccepted/In press - 11 Jun 2019
DateE-pub ahead of print - 13 Jun 2019
DatePublished (current) - 13 Jun 2019

Abstract

This paper reports the results of a set of benchmark medium-scale shaking table tests to investigate the significance of the non-stationary characteristics of ground-motion on nonlinear dynamic responses and the structural damage of reinforced concrete (RC) columns. To examine the influence of ground-motion characteristics, four RC columns are tested under (1) near-field without pulse, (2) near-field pulse-like, and (3) far-field ground-motions. These ground-motion records were spectrally matched by the reweighted Volterra series algorithm without changing non-ergodic characteristics. To explore the confinement effects, two sets of column specimens are designed to represent the modern well-confined and older lightly-confined RC columns. Each column is tested in slight, extensive and complete damage limit states. Then aftershock excitations are conducted to investigate the performance of severely damaged RC columns. Low amplitude white-noise tests are conducted on pristine columns and after each damage limit state experiment to detect natural frequency variant of damaged columns using transfer function estimate. Furthermore, using time–frequency analysis, the real-time variant frequency of test specimens is estimated. The significant duration of ground-motions accounting for the effect of non-stationary characteristics of ground-motion is also estimated by time-cumulative damage analysis of the test results. Finally, the time-variant stiffness degradation of RC columns is estimated.

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via Springer at https://doi.org/10.1007/s10518-019-00668-3 . Please refer to any applicable terms of use of the publisher.

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