Nonlinear Uniaxial Material Model for Reinforcing Steel Bars
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Volume 135, Issue 4
Abstract
Recent advances in nonlinear analysis of reinforced concrete structures have been based primarily on fiber-based discretization of the member cross section at locations of expected inelastic action. However, the accuracy of a fiber-section model is almost entirely dependent on the ability of constitutive material models to represent the overall inelastic behavior of the member. The postyield response of an RC element is controlled by the longitudinal reinforcing steel and the confinement provided by the transverse reinforcement. While adequately confined concrete exhibits stable hysteretic behavior, poorly confined sections degrade rapidly initiated in part by buckling of the longitudinal reinforcement. Particular attention must, therefore, be given to the stress-strain model used to represent the behavior of reinforcing steel bars. The development and validation of an advanced material model for reinforcing bars in RC members is presented in this paper. First, a base material model to describe the primary cyclic stress-strain relationship of reinforcing steel is developed. Using available concepts to initiate bar buckling, low-cycle fatigue fracture, and cyclic degradation, a generic phenomenological material model is developed and implemented in an open-source computational platform. The effectiveness of the new reinforcing bar model is validated through comparison with available experimental data.
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Acknowledgments
This work was supported primarily by the Earthquake Engineering Research Centers Program of the National Science Foundation under Award No. NSFEEC-9701568 through the Pacific Earthquake Engineering Research Center (PEER). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writers and do not necessarily reflect those of the National Science Foundation.
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Published In
Journal of Structural Engineering
Volume 135 • Issue 4 • April 2009
Pages: 335 - 343
Copyright
© 2009 ASCE.
History
Received: Mar 5, 2008
Accepted: Oct 6, 2008
Published online: Apr 1, 2009
Published in print: Apr 2009
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