Finite element modelling of demountable precast reinforced concrete deck slabs with external confining system

Abstract

This paper investigates the enhanced loading capacity and structural behaviour of a transversely confined precast reinforced concrete (RC) deck slab with deconstructable post-installedfriction-grip bolted (PFGB) shear connectors. A detailed 3D non-linearcontinuum-based finite element (FE) model of the deconstructable composite deck with external confining systems (i.e. cross-bracings or ties) and PFGB shear connectors is developed and analysed using the commercial software ABAQUS. The non-linearity of the contacts/interfaces, geometrical and material non-linearities are considered in the FE models. The developed FE models are validated against experimental results and it is shown that the proposed FE model can adequately predict the enhancing effect of arching action in a transversely confined deconstructable precast RC deck slab. Lastly, a parametric study is carried out and effect of different parameters such as compressive strength of concrete, yield strength and proportion of reinforcing bars, clearance between concrete slab and PFGB shear connectors and pretension stress in the PFGB shear connectors on the stiffness and strength enhancement provided by the arching action are evaluated and discussed.