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.
Original language | English |
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Pages (from-to) | 4885-4907 |
Number of pages | 23 |
Journal | Bulletin of Earthquake Engineering |
Volume | 17 |
Issue number | 9 |
Early online date | 13 Jun 2019 |
DOIs | |
Publication status | Published - 1 Sept 2019 |
Keywords
- Ground-motion duration
- Inelastic buckling
- Low-cycle fatigue
- Shaking table
- Time–frequency analysis
- Transfer function estimate
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Dive into the research topics of 'Significance of non-stationary characteristics of ground-motion on structural damage: shaking table study'. Together they form a unique fingerprint.Student theses
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Seismic Performance of Corroded RC Bridge Piers: A Large-Scale Shaking Table Study
Ge, X. (Author), Alexander, N. (Supervisor) & Kashani, M. (Supervisor), 12 May 2020Student thesis: Doctoral Thesis › Doctor of Philosophy (PhD)
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Earthquake and Large Structures (EQUALS) Laboratory
Williams, D. (Manager), Crewe, A. (Manager) & Sextos, A. (Manager)
School of Civil, Aerospace and Design EngineeringFacility/equipment: Facility