Constitutive Model for Inelastic Buckling Behavior of Reinforcing Bars

A refined constitutive model (called "RDM model") is proposed for simulating the complete stress-strain response of longitudinal reinforcing bars, including the onset of inelastic buckling and subsequent degradation in the post-buckling regime. This model accounts for interactions between...

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Bibliographic Details
Published inACI structural journal Vol. 116; no. 2; pp. 195 - 10
Main Authors Akkaya, Yildir, Guner, Serhan, Vecchio, Frank J.
Format Journal Article
LanguageEnglish
Published Farmington Hills American Concrete Institute 01.03.2019
Subjects
Accuracy
Bars
Buckling
Civil engineering
Columns (structural)
Computer simulation
Concrete
Constitutive models
Earthquakes
Material properties
Mathematical models
Postbuckling
Rebar
Reinforced concrete
Seismic engineering
Simulation
Structural engineering
Studies
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Summary:A refined constitutive model (called "RDM model") is proposed for simulating the complete stress-strain response of longitudinal reinforcing bars, including the onset of inelastic buckling and subsequent degradation in the post-buckling regime. This model accounts for interactions between lateral ties and longitudinal bars, and is verified using 45 experimental and 58 analytical specimens previously tested by nine research groups. The RDM model is incorporated into a global modeling procedure and validated with six axially loaded columns, 16 axially and laterally loaded columns, and four beams previously tested by nine research groups. The validated procedure is used to study the influences of global second-order mechanisms such as geometrical nonlinearities, shear effects, and confinement effectiveness on the local buckling behavior. The proposed RDM model is shown to provide accurate response simulations for the buckling of reinforcing bars with a wide range of mechanical and geometrical properties. This model employs simple equations and defines full-range compressive response from well-known tensile material properties. Keywords: inelastic buckling; nonlinear analysis; reinforced concrete elements; reinforcing bar; seismic performance; shear failure; steel reinforcement.
ISSN:0889-3241
1944-7361
DOI:10.14359/51711143