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Structural Engineering and Mechanics
  Volume 26, Number 5, July30 2007 , pages 569-589

Modeling of cyclic bond deterioration in RC beam-column connections
Ricardo Picon-Rodriguez, Carlos Quintero-Febres and Julio Florez-Lopez

    This paper presents an analytical model for RC beam-column connections that takes into account bond deterioration between reinforcing steel and concrete. The model is based on the Lumped Damage Mechanics (LDM) theory which allows for the characterization of cracking, degradation and yielding, and is extended in this paper by the inclusion of the slip effect as observed in those connections. Slip is assumed to be lumped at inelastic hinges. Thus, the concept of ?slip hinge?, based on the Coulomb friction plasticity theory, is formulated. The influence of cracking on the slip behavior is taken into account by using two concepts of LDM: the effective moment on an inelastic hinge and the strain equivalence hypothesis. The model is particularly suitable for wide beam-column connections for which bond deterioration dominates the hysteretic response. The model was evaluated by the numerical simulation of five tests reported in the literature. It is found that the model reproduces closely the observed behavior.
Key Words
    R/C wide beam-column connection; bond deterioration; reinforcement slip; pinching in behavior loops; bond strengths; lumped damage mechanics; inelastic hinges; slip hinge.
Ricardo Picon-Rodriguez: Dept. of Structural Engineering, Lisandro Alvarado University, Barquisimeto, Venezuela
Carlos Quintero-Febres and Julio Florez-Lopez: Dept. of Structural Engineering, University of Los Andes, Merida, Venezuela

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