Slab is one of the basic parts of a building. Slab being the first
element to be designed has pretty much importance as the whole
structural design is based on the design of slab. the loads considered
for its design calculations are carefully chosen and vary according to
the type of structure and its purpose. Slabs can be designed by Direct
Design Method known as DDM and another method for design is Coefficient
Method which is the easier one. Slabs are mainly of two types; either
one way or two way. If the ratio of longer dimension of the slab panel
to the shorter dimension is greater than or equal to 2 then it is
designed as one way slab. If less than 2 then it is designed as a two
way slab. Most of residential and office buildings have rooms that have
two way slab. The basic difference between the two types of slabs is
that: In one way slab load is carried by one direction only that is the
shorter one and hence main reinforcement is provided parallel to the
span whereas temperature or shrinkage reinforcement is provided
perpendicular to the main reinforcement. While in a two way slab load is
carried by both the directions (longer and shorter) and accordingly
main reinforcement is provided in both directions to withstand the
loads. Design of a slab using excel sheet is much easier and time
saving. So today I am going to share with you my excel sheet for the
design of two way slab using coefficient method.