Finite Element Modeling of The Interfacial Behavior At Surface Roughness Concrete Without The Projecting Steel
The development of composite action between precast concrete slab and concrete toppings is important to provide
a monolithic behavior of composite concrete. The current Eurocode 2 provides design expression for interface shear strength
of both concrete base and concrete topping. In this paper, the finite element modeling is presented and calibrated with
experimental results. The interface shear strength between precast concrete slab and cast-in place concrete topping slabs was
evaluated through a set of 9 push-off experiments. Finite Element Modeling package ABAQUS 6.12 was used to model the
interface bond of concrete-to-concrete layers. The push-off test specimens featured segments of precast concrete slabs sized
300 mm × 300 mm × 100 mm with a variety of surface textures including trowel finished, indented and wire-brush
roughened. A cast-in place concrete was poured on top of the concrete base to form a 300 mm × 300 mm × 75 m concrete
topping. Failure of the bonded interfaces was modeled with cohesive zone model (CZM) approach with zero thickess
interface element. The parameters used in the analysis include interface shear strength, fracture energy and elastic shear
stiffness. The study shows that the difference between the model and experimental results is relatively small and therefore
shows the capability of the finite element modeling to carry out interface analysis.
Keywords- Surface Textures, Interface Shear Strength, and Finite Element Modeling.