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Abstract
pre-slab is one of precast concrete elements, which has been used widely in construction of bridges and buildings. pre-cast concrete layer serves as a form or shuttering for the cast-in-place concrete layer. Also the cast-in-place concrete layer can be used for strengthening an existing slab. In this research, the behavior of one way composite pre-slabs were studied. An experimental program was carried out to test nine simply supported slabs, one of them was reference monolithic slab and the remaining eight slabs were composite pre-slabs composed of two concrete layers. The composite pre-slabs were divided into three groups to investigate the effect of shear connectors length and ratio, and interface roughness on the behavior of pre-slabs. Also a theoretical analysis was carried out to confirm the experimental program. It was concluded from these experiments that increasing of shear connectors length or ratio led to increase horizontal shear capacity . Also, the interface roughness had a pronounced effect on the horizontal shear capacity of the composite pre-slab