NUMERICAL SIMULATION OF THE BEHAVIOUR OF PARTIALLYENCASED COMPOSITE COLUMNS

摘要

This paper presents a numerical simulation of the behaviour of partially encased composite(PEC) columns consisting of a thin-walled, welded I-shaped steel section with concrete infill cast betweenthe flanges using the ABAQUS finite element code. A concrete damage plasticity model, which is capableof predicting both compressive and tensile failures as well as volumetric expansion under low confiningpressures, was used to model the concrete material behaviour. The steel-concrete interface in thecomposite column was modelled using the contact pair algorithm in ABAQUS. A friction-type simplemaster-slave contact with small sliding was assumed at the interface of the steel flange and concrete infill.A dynamic explicit solution strategy was used to trace a stable post-peak response of the compositesystem up to failure. The results of the numerical simulation were found to be in good agreement with thepublished results of PEC columns tested under uniaxial compression.