Evaluation, calibration, and verification of a reinforced concrete beam--column joint model

A model for use in simulating the response of reinforced concrete interior beam--column joints is developed and evaluated using an extensive experimental data set. This model builds on previous work by Lowes and Altoontash in 2003, modifying the previously proposed model to improve prediction of response and extend the range of applicability. First, a new element formulation is proposed to improve simulation of joint response mechanisms. Second, a new method for simulating the shear stress-strain response of the joint core is developed. This method assumes joint shear is transferred through a confined concrete strut and simulates strength loss due to load history and joint damage following yielding of beam longitudinal steel. Third, modifications are made to enable better simulation of anchorage zone response. Comparison of simulated and observed response histories indicates that the new model represents well stiffness and strength response parameters for joints with a wide range of design parameters. DOI: 10.1061/(ASCE)0733-9445(2007)133:1(105) CE Database subject headings: Structural analysis; Nonlinear analysis; Two-dimensional analysis; Concrete, reinforced; Earthquake engineering; Finite elements; Constitutive models; Joints; Beam columns.