Mazin Diwan Abdullah
Khamail Abdul-Mahdi Mosheer

A semi-slab of precast concrete (or half-slab) is a structural system that consists of concrete at the bottom half of a slab and concrete cast in situ at the top. To avoid traditional formwork and minimize the bottom half of the slab, this section can function as formwork and reduce the thickness of precast slabs, which makes their transportation easy. The interface between precast and overtopping concrete is effective for the slab system's performance. To improve the half-slab floor system, it is needed to have a shear connector (stirrups). Therefore, to better understand the behavior of this slab system, six full-scale slab specimens (۲×۷.۵ m) with different shapes of the stirrups and spacing between them were constructed for this study. One specimen was produced with no connections and served as a reference specimen, while the other employed stirrups to connect slab units. The tests found that the distribution and type of stirrups affect the structural performance of the semi-precast concrete slab. The maximum load capacity of slabs with rectangular or triangular connections was nearly more significant than reference slabs, reaching ۱۳۶.۱۱ and ۸۶.۱۱%, respectively. The maximum load increased by ۸۱.۴ % for rectangular connections and ۵۴.۹% for triangular connections when the distance between the connectors was reduced from ۶۰۰ to ۳۰۰ mm. Furthermore, stirrups in semi-precast slabs could improve the cracking behavior, stiffness, and ductility. Doi: ۱۰.۲۸۹۹۱/CEJ-۲۰۲۲-۰۸-۰۸-۰۹ Full Text: PDF

Semi-Slabs; Precast Concrete; Site-in-place Concrete; Stirrups; Spacing.