plz send me the design of raft foundation xcel sheet...its for my mtech thesis work

The sub grade soil is considered as an infinite array of individual springs unaffected from the deformation of
others. „ The spring constant is the modulus of sub grade reaction. „The following conditions are to be satisfied for this

value.

„ The rigid analysis gives relatively more conservative design of the raft against bending moment resulting in much bigger section. Hence, flexible design is preferable from the point of view the economy of structure. „ Analysis using this approach has been covered under the course on Soil-Structure Interaction.