Here primary beams are taken and secondary beams are not included in order to make the calculations short. The plan used for gravity analysis of a building is similar to slab panels also. Here, in this problem first a plan of the house is shown then the slab panels are depicted as per the house plan. In one way slab the ratio of longer to smaller span is greater than or equal to 2 while in two-way slab the ratio of longer to smaller span is less than 2. Whereas in one-way slab the reinforcement is provided in one direction as it carries load in one direction. Two-way slabs carry load in two directions and so reinforcements are provided in both directions. Two-way slabs are supported on four sides while one-way slabs are supported on two opposite sides. There are two types of slabs – one-way slab and two-way slab. Usually for residential purpose M20 is used. It is estimated that a concrete slab lasts for about 30 to 100 years if it is built with good grade of concrete and steel. It is several inches thick and it rests on beams and columns. It is made of concrete and reinforcements are provided to support it. A slab is a structural element that is used to support ceilings and floors.
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