Precast Prefabricated In-situ waffle slabs are constructed by pouring concrete in the site or field with proper arrangements. In case of precast waffle slab, slab panels are casted somewhere and they are joined together with proper reinforcement and concrete is filled. Construction process A waffle slab can be made in different ways but generic forms are needed to give the waffle shape to the slab. The formwork is made up of many elements: waffle pods, horizontal supports, vertical supports, cube junctions, hole plates, clits [clarification needed] and steel bars. [4]
Ribbed or Waffle Slab System Advantages & Disadvantages CivilDigital
A waffle slab foundation, also termed as ribbed slab foundation, is a structure that is plain at the top and has a grid-like system (called the ribs) at the bottom. The ribs are formed due to the pouring of concrete over a set of plastic waffles arranged in series on the ground. Waffle slab, also known as ribbed slab, is a popular structural system used in modern buildings due to its advantages such as quick installation, flexibility in design, and reduced construction costs. However, like any other construction method, waffle slab also has its drawbacks that must be considered before its implementation. Two-way joist slab often called two-way ribbed slab or waffle slab is an economical floor system when the spans are long and/or loads are high. Waffle slab analysis and design is similar to the procedure used with flat plates except that special considerations need to be taken into account to reduce the complexity of calculations needed when. Waffle slabs are reinforced concrete systems comprising a perimeter footing (edge beam) and internal beams (strip footings) at regular intervals. This entire system is built directly on the ground surface, providing a sturdy foundation for construction. A waffle pod slab echoes this design but in the realm of construction.
How to make a concrete waffle slab, Construction Procedure, (formwork
Step by step procedure on how a waffle slab(ribbed slab) is constructed.Remember to Comment,like & Subscribe. Waffle slab construction, also known as ribbed slab construction, is a type of reinforced concrete slab that gets its name from the waffle-like pattern created by the intersecting ribs and beams that make up the structure. This construction method has been around since the early 1900s but has gained in popularity in recent years due to its cost. A waffle slab is a two-way joist slab system reinforced with concrete ribs constructed in the perpendicular direction of each other. These are laid in equal depth having a uniform rib appearance. It is called a waffle as it's plain upright and holes underneath giving the appearance of waffles. Figures 1 -1 through 1-3 illustrate typical waffle slab construction using unbonded tendons. A light top mesh over the waffles is generally the only top reinforcement at the interior of the floor panels. FIGURE 1-1 POST-TENSIONED WAFFLE SLAB CONSTRUCTION. Each waffle stem is provided with post-tensioning tendons.
Waffle slab construction details and building model (down right). The
Waffle slabs are reinforced concrete slabs that are normally employed for large-span construction. They can be described as the equivalent of 2-way spanning solid slabs but with a ribbed slab system spanning in both directions. In waffle slabs, the grids run in two directions to provide support for the floor. Three types of structural analysis can be applied for the waffle slab system. Firstly, Rankine-Grashoff Method is an approximate method used for small span grids with rib spacing not exceeding 1.50 m. This method treats the slab as simply supported on edges, computing moments and shear force per unit width of slab strip.
There are two methods by which a waffle slab may be designed based on construction methodology. The first method has the intersecting ribs supported by deep or shallow-band beams which are in turn supported on columns. The waffle slab is formed through the use of special moulds, the dimensions can be obtained from a mould specialist, this includes the width, depth and volume of void per mould. Generally, the standard moulds are 225mm up to 425mm deep with toppings of 50mm - 100mm. Figure 1: Terms for estimating self weight of a waffle slab
Design of Waffle Slabs Structville
The Construction of the waffle slab is done in three ways. First is the In situ construction of the waffle slab, precast Construction and the prefabricated construction. In situ construction of waffle, the slab is done by casting the waffle slab on-site as per the design and the size required. In waffle slab construction, minimum column size is dependent on the overall thickness of the slab. The right-hand scale on the chart above provides minimum square column sizes for various slab thicknesses.. There is no single formula or method for calculating column size for a building. It depends on several factors such as the type of.
