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

Mehdi M Kashani, Laura N Lowes, Adam J Crewe, Nicholas A Alexander

Research output: Contribution to journalArticle (Academic Journal)peer-review

40 Citations (Scopus)
677 Downloads (Pure)

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.
Original languageEnglish
Pages (from-to)163-177
Number of pages15
JournalEngineering Structures
Volume116
Early online date11 Mar 2016
DOIs
Publication statusPublished - 1 Jun 2016

Keywords

  • Nonlinear analysis
  • Finite element method
  • Reinforcing steel
  • Buckling
  • Force-based element
  • Postbuckling
  • Reinforced concrete
  • Bridge piers
  • Low-cycle fatigue
  • Cyclic degradation

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