Analytical behaviour on external beam column joint using steel mesh

Abstract

In this work, a detailed three-dimensional (3D) nonlinear finite element model is developed to study the response and predict the behavior of beam-column connection subjected to cyclic loads that was tested at the karunya Institute of technology and sciences (KITS) laboratory. The beam column joint is modeled using 3D solid elements and surface-to-surface contact elements between the beam/column faces and interface grout in the vicinity of the connection. The model takes into account the pre-tension effect in the post-tensioning strand and the nonlinear material behavior of concrete. Fracture of the mild-steel bars resulted in the failure of the connection. In order to predict this failure mode, stress and strain fields in the mild-steel bars at the beam-column interface were generated from the analyzed model.. In addition, the magnitude of the force developed in the post-tensioning steel tendon was also monitored and it was observed that it did not yield during the entire loading. Steel mesh was developed in the beam to increase the shear capacity. Finite element modeling will provide a practical and economical tool to investigate the behavior of such connections.