Abstract
This paper is concerned with the behaviour and strength of composite plate girders in which, the interaction between the steel plate girder and concrete slab is partial. Based on curvature compatibility principle, an approximate method is proposed from which, the shear capacity and deflection at any given load may be determined. The tension field action developed in web panels at the post-buckling stage is incorporated in the solutions. From the results obtained by using the proposed method, it is found that the flexural stiffness and failure load drop with decrease in degree of interaction. Comparisons are made between the results obtained through the proposed method and the corresponding ones from finite element analysis. A satisfactory correlation between the results in terms of behaviour and strength establishes the accuracy of the proposed method.
Highlights
Steel–concrete composite plate girders display greater strength and stiffness compared to the corresponding bare steel plate girder acting alone
In the analysis presented the contribution in the elastic and post-buckling phases, by the concrete slab to the shear capacity of the girders is assumed in the same proportion as that predicted by the finite element results
Four composite plate girders namely CPG 1, CPG 2, CPG 7 and CPG 8 tested earlier by other researchers (Shanmugam, Baskar 2003; Baskar, Shanmugam 2003) were employed in the present study in order to establish the accuracy of the proposed method and to assess the influence of partial interaction
Summary
Steel–concrete composite plate girders display greater strength and stiffness compared to the corresponding bare steel plate girder acting alone. Flexible shear connectors permit development of partial composite action due to strain incompatibility at the interface and the analysis procedures require consideration of the interlayer slip between the materials. Second-order differential equation allowing for slip in composite beams was first developed by Newmark et al (1951) by assuming equal curvature between the interacting elements. Adekola (1968) presented an interaction theory for composite beams allowing for interface friction, slip and uplift deformation. An approximate method is developed in this paper to determine the load–deflection relationships and to predict the ultimate strength of supported composite plate girders with partial interaction. The uplift deformation or separation between elements is negligible as it is assumed that, both elements deflect with the same amount of curvature along the length The longterm effects such as creep and shrinkage in the concrete are disregarded
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