Modeling of Nonlinear Cyclic Behavior of Reinforcing Bars

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Title: Modeling of Nonlinear Cyclic Behavior of Reinforcing Bars

Author(s): H. Nakamura and T. Higai

Publication: Special Publication

Volume: 205

Issue:

Appears on pages(s): 273-292

Keywords: buckling; finite element method; large deflection theory; stress average strain relationship

Date: 1/1/2002

Abstract:
The buckling of reinforcing bars is investigated analytically and several indices which characterize the buckling behavior are introduced based on the analytical results. In this paper, buckling analysis of the reinforcing bars is performed by the finite element method using large deflection theory of layered beam elements. The buckling behavior is considered under monotonic and cyclic loading. Based on the analytical results, several indices such as the buckling stress, the residual stress and the buckling mode are used to characterize the buckling behavior. Considering these results, a stress-average strain relationship of the reinforcing bars is developed accounting for inelastic buckling. The model features a post-buckling softening branch, since the buckling behavior is considered in the form of a material property, which is an easy method to introduce the effect of buckling in the finite element method.