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Collapse assessment of reinforced concrete building columns through multi-axis hybrid simulation

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posted on 2024-07-26, 14:22 authored by Javad HashemiJavad Hashemi, Hing Ho TsangHing Ho Tsang, Y. Al-Ogaidi, John WilsonJohn Wilson, Riadh Al-MahaidiRiadh Al-Mahaidi
One of the major challenges in collapse assessment of reinforced concrete (RC) structures has been the lack of realistic data obtained from reliable experimental loading protocols that are capable of accurately quantifying the reserve capacity of RC structures beyond the design level to the state of complete collapse. Until now, quasi-static (QS) symmetrically cyclic or monotonic tests with constant axial load have been commonly used, which are not adequate to accurately capture the actual response of a collapsing RC structure in real earthquake events. Hybrid simulation (HS) can be considered an attractive alternative to realistically simulate more complex boundary conditions and improve response prediction of a structure from elastic range to collapse. This paper presents a comparative experimental study on two identical, large-scale, limited-ductility RC columns that are tested to collapse through QS and HS, respectively. The RC columns serve as the first-story corner-column of a half-scale symmetrical five-byfive- bay five-story RC ordinary moment frame building structure. A state-of-the-art facility, referred to as a multi-axis substructure testing (MAST) system, is used that is capable of controlling all six-degrees-of-freedom (6-DOF) boundary conditions in mixed load and deformation modes. The load protocol in the QS test includes constant axial load combined with bidirectional lateral deformation reversals, while in the HS, more realistic boundary effects including fluctuation in axial load and the ratcheting behavior (that is, asymmetrical lateral deformation prior to collapse) are simulated. The hysteretic response behaviors obtained from the QS and HS tests are then used for calibrating the analytical models employed in a comparative collapse risk assessment. The results show that the improved interface boundary effects lead to significant changes in hysteretic response and the calibration parameters and, as a result, estimating the probability of collapse. This highlights that the credibility of collapse assessment results relies to a great extent on the application of correct boundary interface on RC columns.

Funding

Hybrid testing facility for structures under extreme loads

Australian Research Council

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Collapse assessment of reinforced concrete buildings in regions of lower seismicity

Australian Research Council

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Displacement Controlled Behaviour of Non-ductile Structural Walls in Regions of Lower Seismicity

Australian Research Council

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History

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PDF (Accepted manuscript)

ISSN

0889-325X

Journal title

ACI Materials Journal

Volume

114

Issue

2

Pagination

13 pp

Publisher

American Concrete Institute

Copyright statement

Copyright © 2017 American Concrete Institute. The author's accepted manuscript is reproduced here in accordance with the copyright policy of the publisher.

Language

eng

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