In-plane bar buckling in RC columns in extreme seismic events

A. Nojavan, A. E. Schultz, S. H. Chao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A clear understanding of resistance mechanisms in reinforced concrete (RC) columns under extreme earthquakes is crucial as column failure can lead to structural collapse. To enhance such understanding, seven full-scale reinforced concrete columns were tested under distinct monotonic and cyclic loading protocols, similar to those that RC columns experience during large earthquakes. The columns were representative of columns in mid- or high-rise buildings, located in high seismic zones, and were designed according to seismic provisions of ACI 318-11 [1]. Transverse ties were placed at close spacing along column height to prevent reinforcing bar buckling and to enhance ductility. However, during the tests, longitudinal bars were observed to buckle in-plane (i.e., parallel to column compression face); a failure mechanism that has not been addressed in previous RC column tests. While transverse ties could prevent or postpone out-of-plane bar buckling, they were found to have no effect in restraining the bars from in-plane buckling. The observed in-plane bar buckling phenomenon is investigated analytically using three-dimensional (3D) nonlinear finite element (FE) models of the tested columns. The FE model was validated with experimental results and was used to study the effect of several parameters that can affect in-plane bar buckling including concrete compressive strength (fc), longitudinal bar size and spacing, transverse tie spacing, and cross sectional size. The analysis shows that RC columns that feature a larger cross section with larger longitudinal bar sizes and are built with a lower strength concrete are more susceptible to in-plane bar buckling.

Original languageEnglish (US)
Title of host publication11th National Conference on Earthquake Engineering 2018, NCEE 2018
Subtitle of host publicationIntegrating Science, Engineering, and Policy
PublisherEarthquake Engineering Research Institute
Pages2839-2843
Number of pages5
ISBN (Electronic)9781510873254
StatePublished - 2018
Event11th National Conference on Earthquake Engineering 2018: Integrating Science, Engineering, and Policy, NCEE 2018 - Los Angeles, United States
Duration: Jun 25 2018Jun 29 2018

Publication series

Name11th National Conference on Earthquake Engineering 2018, NCEE 2018: Integrating Science, Engineering, and Policy
Volume5

Conference

Conference11th National Conference on Earthquake Engineering 2018: Integrating Science, Engineering, and Policy, NCEE 2018
CountryUnited States
CityLos Angeles
Period6/25/186/29/18

Bibliographical note

Publisher Copyright:
© (2018) by Earthquake Engineering Research Institute All rights reserved.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

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