A nonlinear material model of corroded rebars for seismic response of bridges

Davide Lavorato, Angelo Pelle, Gabriele Fiorentino, Camillo Nuti, Alessandro Rasulo

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

A generalized cyclic steel model characterized by isotropic and kinematic hardening, inelastic buckling in compression and corrosion for the rebar in reinforced concrete (RC) structures is presented. This model has been implemented in in-house fiber program CY.R.U.S.-M developed in MATLAB, to perform the seismic analysis of RC sections. The model is especially accurate, with respect to experimental cyclic behavior of rebars with buckling in compression, in case the strain in compression does not exceed 1.2 - 1.5 %. Four RC sections were selected as the case studies for a single concrete geometry and different steel configurations assumed representative of RC bridge piers (in a suitable scale) and subjected to a cyclic curvature history representative of a severe seismic load, not far from collapse. Different rebar characteristics (yielding stress, maximum stress, hardening ratio), axial loads, corrosion percentages have been selected to perform some cyclic parametric analyses. The numerical results have shown that the maximum strain of the rebar in compression is always smaller than 1.2 - 1.5 % and therefore the simple model for the steel is a valid tool for the structural assessment. Finally, corrosion of the rebars reduces the section capacity in term of strength and energy dissipation.

Original languageEnglish
Title of host publicationCOMPDYN 2019 - 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, Proceedings
EditorsManolis Papadrakakis, Michalis Fragiadakis
PublisherNational Technical University of Athens
Pages3656-3672
Number of pages17
ISBN (Electronic)9786188284470
DOIs
Publication statusPublished - 2019
Event7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2019 - Crete, Greece
Duration: 24 Jun 201926 Jun 2019

Publication series

NameCOMPDYN Proceedings
Volume2
ISSN (Print)2623-3347

Conference

Conference7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2019
CountryGreece
CityCrete
Period24/06/1926/06/19

Keywords

  • Buckling
  • Corroded rebars
  • Corrosion
  • Cyclic steel model
  • RC bridge
  • Seismic response

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