Nonlinear Finite Element Analysis of Different Precast Beam-Column Connections

Abstract

Recently, there is an increasing trend towards construction of precast concrete structures. In precast structures, connections are critical element, because most of the structures failed in past due to connection failure. Connection plays an important role in transferring forces from one element to another element of the structure. So understanding behaviour of connection is necessary. Generally, experiments are performed to evaluate behaviour of any structural element including precast connections, but many times it becomes very time consuming as well complex due to handling of large size test specimens. So, it is important to carry out numerical simulations by simulating exact conditions as that of experimental program. Nonlinear Finite Element (FE) analysis is the effective way to replicate experimental programme, which is used widely now a days. In this study, nonlinear FE analysis are carried out on various precast wet connections and precast dry connection under column removal scenario using ABAQUS software. Finite Element models are prepared for various precast specimens constructed by adopting different connection detailing. Concrete Damage Plasticity (CDP) model proposed by Saenz is adopted to incorporate material nonlinearities of concrete. Steel is assumed to elastic perfectly plastic material and elastic properties are consider for M50 grade micro concrete used as cast-in-place concrete at connection region for precast wet connections. Continuum 3D with 8-node Brick element with reduced integration technique (C3D8R) is used for modelling of concrete and Truss 3D with 2-node element (T3D2) is used for steel reinforcement bars embedded in concrete. Results obtained from numerical simulations are validated with those available in literature. After performing analysis of various precast connections under middle column removal scenario, analytical results i.e. load-deflection, load-strain, stress are compared with that of available experimental results. Comparison of results shows good correlation between experimental and analytical results within elastic phase.