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Nonlinear fiber element modeling of RC bridge piers considering inelastic buckling of reinforcement

Nonlinear fiber element modeling of RC bridge piers considering inelastic buckling of reinforcement
Nonlinear fiber element modeling of RC bridge piers considering inelastic buckling of reinforcement
An advanced modelling technique is developed to model the nonlinear cyclic response of circular RC columns using fibre-based section discretisation method. A comparison between different reinforcing steel models is made. Through a comprehensive parametric study the influence of inelastic buckling of vertical reinforcement on the cyclic response of circular RC columns is investigated. The results have been compared and validated against a set of experimental datasets. The proposed calibrated model accounts for the influence of inelastic buckling of vertical reinforcement and interaction of stiffness of horizontal ties reinforcement with vertical reinforcement. The model also accounts for the fracture of vertical bars due to low-cycle high-amplitude fatigue degradation. Therefore, this model is able to predict the nonlinear cyclic response of circular RC columns up to complete collapse. The results show that the existing uniaxial material models of reinforcing bars that are calibrated using stress-strain behaviour of isolated bars cannot represent the behaviour of reinforcing bars inside RC columns. Moreover, it is found that the buckling length of vertical reinforcement has a significant influence on the pinching response of RC columns and also reduces the low-cycle fatigue life of buckled reinforcement
Nonlinear analysis, Finite element method, Reinforcing steel, Buckling, Force-based element, Postbuckling, Reinforced concrete, Bridge piers, Low-cycle fatigue, Cyclic degradation
0141-0296
163-177
Kashani, Mohammad
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Lowes, Laura N.
7cfd0770-3fdc-43bf-842a-3dfbfed41dad
Crewe, Adam J.
e04910c2-1e89-4d59-b49b-af4e9e28639e
Alexander, Nicholas A.
544fc8c7-40a4-4e81-aaab-89e78f1a6fc9
Kashani, Mohammad
d1074b3a-5853-4eb5-a4ef-7d741b1c025d
Lowes, Laura N.
7cfd0770-3fdc-43bf-842a-3dfbfed41dad
Crewe, Adam J.
e04910c2-1e89-4d59-b49b-af4e9e28639e
Alexander, Nicholas A.
544fc8c7-40a4-4e81-aaab-89e78f1a6fc9

Kashani, Mohammad, Lowes, Laura N., Crewe, Adam J. and Alexander, Nicholas A. (2016) Nonlinear fiber element modeling of RC bridge piers considering inelastic buckling of reinforcement. Engineering Structures, 116, 163-177. (doi:10.1016/j.engstruct.2016.02.051).

Record type: Article

Abstract

An advanced modelling technique is developed to model the nonlinear cyclic response of circular RC columns using fibre-based section discretisation method. A comparison between different reinforcing steel models is made. Through a comprehensive parametric study the influence of inelastic buckling of vertical reinforcement on the cyclic response of circular RC columns is investigated. The results have been compared and validated against a set of experimental datasets. The proposed calibrated model accounts for the influence of inelastic buckling of vertical reinforcement and interaction of stiffness of horizontal ties reinforcement with vertical reinforcement. The model also accounts for the fracture of vertical bars due to low-cycle high-amplitude fatigue degradation. Therefore, this model is able to predict the nonlinear cyclic response of circular RC columns up to complete collapse. The results show that the existing uniaxial material models of reinforcing bars that are calibrated using stress-strain behaviour of isolated bars cannot represent the behaviour of reinforcing bars inside RC columns. Moreover, it is found that the buckling length of vertical reinforcement has a significant influence on the pinching response of RC columns and also reduces the low-cycle fatigue life of buckled reinforcement

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More information

Accepted/In Press date: 29 February 2016
e-pub ahead of print date: 11 March 2016
Published date: 1 June 2016
Keywords: Nonlinear analysis, Finite element method, Reinforcing steel, Buckling, Force-based element, Postbuckling, Reinforced concrete, Bridge piers, Low-cycle fatigue, Cyclic degradation
Organisations: Infrastructure Group

Identifiers

Local EPrints ID: 406352
URI: http://eprints.soton.ac.uk/id/eprint/406352
ISSN: 0141-0296
PURE UUID: 51a6a74b-69c4-447d-9279-7c2c7256f9df
ORCID for Mohammad Kashani: ORCID iD orcid.org/0000-0003-0008-0007

Catalogue record

Date deposited: 10 Mar 2017 10:45
Last modified: 16 Mar 2024 04:29

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Contributors

Author: Laura N. Lowes
Author: Adam J. Crewe
Author: Nicholas A. Alexander

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