Analytical hysteretic model for reinforcing bars.

Highlights • An analytical hysteretic model for reinforcing bars including buckling is proposed. • Model control parameters are identified using the genetic algorithm. • Prediction equations of control parameters are established by regression analysis. • The proposed model is implemented in OpenSees. • Nonlinear analyses of both isolated reinforcing bars and RC columns are performed. Abstract This paper proposes an analytical hysteretic model for reinforcing bars considering the effects of inelastic buckling and low-cycle fatigue. A strain-dependent post-yield stiffness ratio formula is introduced into the traditional Bouc-Wen model to make it possess the asymmetrical characteristic, so that the compressive stress softening effect generally exhibited by buckling bars can be reasonably described. Meanwhile, the low-cycle fatigue degradation is also contained in the model. Based on the collected experimental hysteresis loops of reinforcing bars, the model control parameters are identified using the genetic algorithm. The corresponding prediction equations of control parameters in terms of physical parameters of the reinforcing bar, such as the slenderness ratio, yield strength and ultimate strength-to-yield strength ratio, are then established by regression analysis. Furthermore, the proposed model is implemented in OpenSees, an open-source computational platform. The effectiveness of the proposed model is verified by performing the comparison with the experimental results of both isolated reinforcing bars and reinforced concrete columns. [ABSTRACT FROM AUTHOR]