An experimental investigation was carried out on a total of six specimens
representing flat slab-column connections at interior columns. For reasons of
economy and ease of handling the specimens were half scale ones. The aim of this
investigation was to study the effects of some parameters on the punching shear
strength and behavior of such connections when subjected simultaneously to the
action of an axial force and moment. The parameters studied were moment to shear ratio, Column aspect ratio, column side length to slab depth ratio, and presence of openings in the slab region next to the column stub. Results of the investigation revealed noticeable influence of all parameters on the ultimate strength and the behavior of the tested specimens except for column side length to slab depth ratio whose effect was found to be relatively low.