Twoway joist waffle slab design approach and methodology. The construction of waffle slabs can be done by three ways as follows. Nowadays, waffle slabs are a demand for structural designers, as a consequence of architectural design evolution and. Twoway joist waffle slab design approach and methodology twoway joist slab often called twoway ribbed slab or waffle slab is an economical floor system when the spans are long andor loads are high. Numerical and experimental study of a real scale waffle slab. Pdf analysis of steel concrete composite waffle slab. Although sloping sites can be accommodated for with slab on ground construction. Waffle slab analysis and design is similar to the procedure used with flat plates except that special considerations need. It can be shown from below side and slab has a plain top. Concrete slabs on ground are becoming the more common type of construction especially in the new subdivisions which are flat sites. Waffle slab requires only 70% of concrete and 80 % of steel from the concrete and steel used for stiffened raft. Flat plates and flat slab construction is popular due to its architectural advantage and smaller depth of structural. Waffle slab are preferred for longer span which are greater than 12 m. The waffle slab has been considered as monolithically connected to band beams.
Twoway joist concrete slab floor waffle slab system analysis and design. Due to the underneath ribs, it is also called ribbed slab. In this 3d animation, youll see six simple steps to build a wafflemat foundation, from clearing the pad to setting the individual waffleboxes, to. In this paper, the optimum design of reinforced concrete waffle slabs is so ught using the simple genetic algorithm.
Technical note 5 slab does not adequately represent the mechanical properties of a stemmed floor system for analysis and design. Feasibility of structural design of members has been ensured under the provision of is. Frame method described and illustrated in details here for modeling. Waffle slab or ribbed slab construction procedure and. The structural modeling used in most commercially available software, where stems are considered as disjointed from the topping slab does not deliver the advantages associated with waffle slab slab construction. There are two types of raft slabs, a traditional raft and a waffle raft. Waffle slab or ribbed slab construction procedure and advantages.
The concrete waffle slab is often used for industrial and commercial buildings while wood and metal waffle slabs are used in many other construction sites. Twoway joist concrete slab floor waffle slab system. Analysis and design of waffle slab with different boundary conditions article pdf available in indian concrete journal vol. Pdf analysis and design of waffle slab with different. See more ideas about waffle ceiling, architecture details and architecture design.
Formwork construction and pouring of concrete occur on site, then the slab is assembled if required. Waffle slab construction consists of rows of concrete joists at right angles to each. Optimum design of reinforced concrete waffle slabs researchgate. Direct design method is used for the structural analysis and design of slabs. Design of waffle slab without beams by direct design method. A waffle slab is a concrete slab made of reinforced cement concrete with concrete ribs which are running in two directions. Design of waffle slab without beams by direct design method 32 32 32 c 1 c 2 c 3 c 4 2 c. Pdf optimum design of reinforced concrete waffle slabs. The lateral loads are independently resisted by shear walls. This technical note offers several views of posttensioned waffle slab constructions, and. A waffle slab has a holes underneath, giving an appearance of waffles. Waffle slab foundation features and construction details a waffle slab foundation, also termed as ribbed slab foundation, is a structure that is plain at the top. Twoway joist concrete slab floor waffle slab system analysis and design design the concrete floor slab system shown below for an intermediate floor with partition weight of 50 psf, and unfactored live load of 100 psf. Waffle slab foundation features and construction details a waffle slab foundation, also termed as ribbed slab foundation, is a structure that is plain at the top and has a gridlike system called the ribs at the bottom.
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