Analytical model for axial stress-strain behavior of welded reinforcement grid confined concrete columns

Abstract

In a previous study by the authors, the innovative technology of applying welded reinforcement grids (WRG) as confining steel of reinforced concrete columns (instead of traditional ties) under compression loading was experimentally investigated. A stress-strain model of concrete which takes confinement effects into account is developed based on the results of compression loading tests of reinforced concrete column specimens. The stress-strain model is formulated by evaluating the relationship between several key parameters (effective confining pressure, peak stress, strain, and ductility) and the stress-strain behavior observed in the experiments. Analytical results are then compared to experimental values available in the literature. It is shown that the predicted stress-strain relation provides better agreement with the experimental results than existing models.