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Significance of non-stationary characteristics of ground-motion on structural damage: shaking table study

Significance of non-stationary characteristics of ground-motion on structural damage: shaking table study
Significance of non-stationary characteristics of ground-motion on structural damage: shaking table study
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.
1570-761X
Kashani, Mohammad
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Ge, Xiao
10e10ee6-c5d4-4891-83e6-e430f170ce95
Dietz, Matthew S.
02853539-f391-44dd-8677-c34bcce1b738
Crewe, Adam J.
d6cfc6da-5680-43b0-869a-6f48146fd053
Alexander, Nicholas A.
474f1a77-22d6-40b5-b242-ecaa0de26bf3
Kashani, Mohammad
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Ge, Xiao
10e10ee6-c5d4-4891-83e6-e430f170ce95
Dietz, Matthew S.
02853539-f391-44dd-8677-c34bcce1b738
Crewe, Adam J.
d6cfc6da-5680-43b0-869a-6f48146fd053
Alexander, Nicholas A.
474f1a77-22d6-40b5-b242-ecaa0de26bf3

Kashani, Mohammad, Ge, Xiao, Dietz, Matthew S., Crewe, Adam J. and Alexander, Nicholas A. (2019) Significance of non-stationary characteristics of ground-motion on structural damage: shaking table study. Bulletin of Earthquake Engineering. (doi:10.1007/s10518-019-00668-3).

Record type: Article

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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More information

Accepted/In Press date: 11 June 2019
e-pub ahead of print date: 13 June 2019

Identifiers

Local EPrints ID: 431844
URI: http://eprints.soton.ac.uk/id/eprint/431844
ISSN: 1570-761X
PURE UUID: 3075c46a-9f87-4647-9379-6cbc976ea391
ORCID for Mohammad Kashani: ORCID iD orcid.org/0000-0003-0008-0007

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Date deposited: 19 Jun 2019 16:30
Last modified: 23 Apr 2024 04:01

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Contributors

Author: Xiao Ge
Author: Matthew S. Dietz
Author: Adam J. Crewe
Author: Nicholas A. Alexander

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