Waffle Slab Roof Structure

Waffle system provides an attractive ceiling that can be left exposed when possible producing savings in architectural finishes.

Waffle slab roof structure.

The minimum slab thickness allowed for joist slabs is one twelfth the clear rib spacing or 1 5 in. The grid is formed by the removal of molds after the concrete sets. The top of ribbed slab is normally thin and the bottom grid lines are generally ribs which are laid perpendicular to each other with equal depth. This kind of slab is majorly used at the entrance of hotels malls restaurants for good pictorial view and to install artificial lighting.

This structure was designed to be more solid when used on longer spans and with heavier loads. Waffle slab has two directional reinforcement. For example the florida based company hurricane proof systems offers a 7 inch 18 centimeter slab of concrete in three layers. A concrete roof is exactly what it sounds like.

The whole footing and slab system is constructed on top of the ground. Waffle slabs can be described as the equivalent of 2 way solid slabs especially when the spans are large and ribbed system is to be adopted. The reinforced concrete waffle slab ribbed slab cross section reinforcement detail includes ribbing beams reinforcement slab top wire mesh waffles dimensioning voids width and. Waffle slab or ribbed slab is a structural component which is plain on its top and contains grid like system on its bottom surface.

A waffle slab is flat on top while joists create a grid like surface on the bottom. In waffle slabs a drop panel is automatically invoked to guarantee adequate two way punching shear resistance at column supports. Reinforcement detail for a waffle slab support on a reinforced concrete main frame end slab beam. Exact specifications vary but most concrete roofs are several inches thick.

Aci 318 14 8 8 2 1 1 drop panels drop heads. The design of waffle slabs is the same as that of ribbed slabs with the difference being that waffle slabs have ribs spanning in both directions and the coefficients used for analysing the slab is similar to those used for two way restrained slab. Ribbed waffle slab system ribbed floors consisting of equally spaced ribs are usually supported directly by columns they are either one way spanning systems known as ribbed slab or a two way ribbed system known as a waffle slab. Waffle slab waffle slab is a reinforced concrete roof or floor containing square grids with deep sides and it is also called as grid slabs.

This form of construction is not very common because of the formwork costs and the low fire rating. A waffle slab system will be investigated since it is economical for longer spans with heavy loads. Waffle slabs are a reinforced concrete footing and slab system constructed on the ground.