In this research, an analytical model is presented to study the shear behavior of prestressed hollow core slabs. The study is conducted with respect to the shear considering a concentrated line load (in absence of concrete topping and filling of cores) using finite elements method adopted by the computer program ANSYS. The finite element models are developed using a smeared cracking approach for the concrete and three-dimensional link elements for the prestressing strands. The ANSYS finite element analysis results are compared with the experimental data of two prestressed hollow core slabs. The comparisons are made for load-deflection curves, failure load and crack pattern. The accuracy of the finite element models is assessed by comparison with the experimental results, which are to be in good agreement.

Instead of performing a costly experimental study to find out whether the effect of different factors on the prediction of shear behavior of hollow core slabs, a numerical model can be developed. From the numerical analysis, the effective of load width across the slab width can be derived. This paper present the shear behavior of prestressed hollow core slabs and examined the effect of load width (in absence of concrete topping and filling of cores) on their effective shear behavior. In the present investigation, physical tests and 3-D finite element models were developed using the general-purpose finite element software ANSYS 11.0 to simulate the behavior of tested slabs. The specimens used in this research have a depth of 150 mm and the numerical models are calibrated using the data obtained from physical experiments. The ANSYS finite element analysis results are compared with the experimental data of two prestressed hollow core slabs. The comparisons are made for load-deflection curves, failure loads and crack patterns, respectively. The accuracy of the finite element models is assessed by comparison with the experimental results, which are in good agreement.

The phenomenon of the punching failure of reinforced concrete slabs and the effect of the pre-stressing on the failure mechanism has been investigated in this paper. This paper deals with the behavior of pre-stressed concrete slabs, subjected to symmetrically static loading. A numerical model based on the finite element method using the computer program "ANSYS" (version 11).Sixteen pre-stressed flat slabs and one conventional flat slab has been analyzed. All the slabs represent an interior slab-column connection. The slabs have dimensions 900x900x80 mm, with interior square column 132x132 mm. The main objective of this research is to study the effect of pre-stressing force and its distribution along the crosssection of slab on the punching failure.