Reinforced concrete columns with insufficient transverse reinforcement and non-seismic details are vulnerable to shear failure and loss of axial load carrying capacity in the event of an earthquake. In this study, the application of two macro models is examined using previously tested shear critical reinforced concrete columns subjected to lateral loads. One of the approaches simulates lateral load-deformation response by estimating deformation components due to flexure, reinforcement slip and shear individually and then combing them according to a set of rules specified for each category. The columns classified into categories based on comparison of their predicted shear and flexural strengths. The other approach, Axial-Shear-Flexural Interaction method, considers the interaction of axial deformations and concrete compression softening to couple shear and flexural mechanisms while satisfying compatibility and equilibrium conditions in average stress-average strain field. Capabilities of both models are evaluated in terms of predicting mode of failure, ultimate lateral loads and drifts, and post-peak responses. Based on the comparison of experimental and analytical results, conclusions are drawn to improve response estimation by either of the models. Implementation of suggested analytical procedure results in satisfactory response envelope curves which can be used for development of cyclic response models.
Discussion(0)
No comments yet. Be the first to comment.