Ribbed slab etabs11/20/2022 ![]() ![]() Waffle slabs are preferred for flat topographical areas not sloped sites.Waffle slabs are thicker than flat slabs, so the height between each floor must be greater to have enough space for the slab system and other building services.Greater quantities of formwork materials are needed, which can be very costly.One proprietary implementation of this system is called Holedeck. If holes are provided between the ribs, building services can be run through them.Forms can be implemented with wood, concrete or steel.Greater load capacity than traditional one-way slabs.Some people find the waffle pattern aesthetically pleasing.Bigger spans can be achieved with less material, being more economical and environmentally friendly. ![]() Better for buildings that require less vibrations – this is managed by the two way joist reinforcements that form the grid.The waffle slab floor system has several advantages: The following are rules of thumb, which are explained further in the accompanying diagrams:ĭiagram shows the width of the column head with rule of thumb formula Advantages ĭifferent guides have been made for architects and engineers to determine various parameters of waffle slabs, primarily the overall thickness and rib dimensions. Pre-fabricated: The reinforcements are integrated into the slab while being manufactured, without needing to reinforce the assembly on site.Precast: The slabs are made somewhere else and then brought to the site and assembled.In situ: Formwork construction and pouring of concrete occur on site, then the slab is assembled (if required).This process may occur in three different approaches, however the basic method is the same in each: First the supports are built, then the pods are arranged in place, and finally the concrete is poured. The formwork is made up of many elements: waffle pods, horizontal supports, vertical supports, cube junctions, hole plates, clits and steel bars. There are two types of waffle slab system:Ī waffle slab can be made in different ways but generic forms are needed to give the waffle shape to the slab. Waffle slabs are composed by intricate formwork, and may be more expensive than other types of slabs, but depending on the project and the quantity of concrete needed it may be cheaper to build. It is also used in buildings that require big open spaces, like theatres or train stations. ![]() This type of structure, because of its rigidity, is recommended for buildings that require minimal vibration, like laboratories and manufacturing facilities. This structure was designed to be more solid when used on longer spans and with heavier loads. The grid is formed by the removal of molds after the concrete sets. A waffle slab is flat on top, while joists create a grid like surface on the bottom. ![]()
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