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PROCEEDINGS OF THE TENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Edited by: B.H.V. Topping, J.M. Adam, F.J. Pallarés, R. Bru and M.L. Romero
Finite Element Modelling and Parametric Study of Three-Dimensional Semi-Rigid Composite Joints
B. Gil, R. Goñi and E. Bayo
Department of Structural Analysis and Design, School of Architecture, University of Navarra, Spain
B. Gil, R. Goñi, E. Bayo, "Finite Element Modelling and Parametric Study of Three-Dimensional Semi-Rigid Composite Joints", in B.H.V. Topping, J.M. Adam, F.J. Pallarés, R. Bru, M.L. Romero, (Editors), "Proceedings of the Tenth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 229, 2010. doi:10.4203/ccp.93.229
Keywords: finite element model, semi-rigid composite connection, three-dimensional, parametric study.
The behaviour of composite semi-rigid joints has been researched since the seventies. The results of this research have been compiled in several papers which describe experimental programs, numerical models and analytical models. However, the investigation in composite joints has not been as prolific as in steel joints, and there are still many issues to be investigated. One of these is the behaviour of three-dimensional semi-rigid composite joints, that is, columns with beams attached to both the strong and the weak axis.
In order to pursue this end, a parametric study of the behaviour of three-dimensional semi-rigid composite joints has been carried out by means of extensive finite element analyses. The finite element models have previously been validated by means of experimental results obtained from three tests, one three-dimensional semi-rigid composite joint subjected to proportional loads and one subjected to non-proportional loads. The design of the major axis connection is made with a bolted flush end plate and the central rebars of the slab passing through the column flanges, while that of the minor axis is built by means of an additional plate welded to the column flanges. This procedure has been used instead of attaching the minor beam to the column web.
The models have been analysed using the software Abaqus. The modelling process as well as the selection of the type of elements and constitutive models for the concrete behaviour has posed a considerable challenge. We describe in this paper all the parameters, element types, mesh sizes, contact properties and interactions, concrete model, etc. introduced in the model, which have led us to obtain accurate results. This knowledge and experience may be of use to other researchers in this area.
The conclusions obtained from a parametric study are also presented. The parametric study involved an investigation on the influence of the main components of the proposed joint design such as: column web in shear, tension or compression; column flange under bending; end plate and additional plates in bending and rebars in tension.
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