الفهرس 
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Abstract
Composite post tensioned Precast concrete girders are generally used in highway bridge construction as one of the fastest methods of construction. It is often better to transfer girders and slabs separately to decrease the weight during transport and lifting. The shear connector is required to resist the horizontal shear at the interface surface so that the concrete web and the concrete flange act as a composite unit.
This research aims to investigate the composite behavior of post tensioned precast concrete girders with top slabs. The bottom part is precast and the top part is cast-in-place. The experimental study consisted of testing six composite T-girders under two-point loading. The first specimen is post tensioned T-section cast monolithically and act as control specimen. In the other five specimens, the web and the flange of the girder were poured separately then connected together. The investigated variables are the shear connectors’ distribution, extending girder stirrups to act as shear connectors, the top slab width, and the concrete strength of top slabs. The strength and deformational behavior of specimens are discussed and conclusions are obtained. The analytical study includes a numerical analysis by using non-linear finite element program (ABAQUS/CAE2020) to verification of experimental results. Moreover, using available models from literature and codes provisions used for calculating shear transfer failure load, and compared with the experimental results to determine the best correlation with the experimental results.
The test results showed that using the shear connectors or full stirrups to connect the top slabs to the girders, could achieve the full capacity of the monolithic girder. Increasing the slab width improved the ductility of the composite T-girders. Using lower concrete strength of topping slabs lead to increasing slippage between top slabs and girders. Comparison between the analytical results of available models, codes provisions, and experimental results was conducted and conclusion has been made.