PRAGMATIC DAMAGE CONSTITUTIVE MODEL FOR CONCRETE. Ⅱ: APPLICATION TO BEAM-COLUMNS

摘要

To verify the damage model proposed in the first paper of this paper series, the simulations for the reinforced beam-column elements are systematically conducted in the present paper. The RC beam is firstly analyzed in this work. Based on the generalpurposed finite element software ABAQUS, the three dimensional refined finite element model is developed. That is to say, the concrete is modeled by using the solid element and the discrete reinforcements modeling is considered by using the bar element. The interaction between concrete and reinforcements is represented by the embedding technique. To precisely simulate the shear failure of the RC beam, the two-dimensional performance of the present damage model is carefully considered in the present work. The refined finite element model is also built for a column subjected to monotonic eccentric loading. Besides the damage model developed for the concrete, the bi-linear isotropic plastic model is adopted for the steel reinforcement. The load-displacement curves are shown against the experimental data for the beam as well as the column. And the stress contours of the concrete solid and the reinforcement lattice are also shown in this paper, which will improve our understanding for the stress distribution within RC elements.