Numerical Modeling and Seismic Assessment of Columns Reinforced by Smooth Rebars

SUMMARY:
There are many concrete structures that have been constructed before 1970, and have been reinforced by plainbars. For retrofitting these structures, it is necessary to investigate seismic performance of them, and to evaluatetheir ductility, strength, stiffness and energy dissipation. The objective of the present paper is to propose anumerical model to simulate the response of concrete columns with old design details, i.e., reinforced by smoothbars. The model is based on bond-slip properties of smooth bars derived from pullout tests. The global behavior,then, is calibrated by results of cyclic and monotonic tests performed on four concrete columns reinforced bysmooth bars. The numerical modeling carried out by MATLAB programming, considers three displacementcomponents of column, under lateral and axial loads simultaneously; flexure, slip, and shear. Also in this model,the rocking mode as a result of slip contribution is investigated.

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