Combined pad Foundation Assessment 2023

ASSIGNMENT 2
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1) Pad foundation are the shallow foundation that bears the load and spread it to the soil
below it. It is used where the soil don’t have much strength and is not too deep to
construct.
Types of pad foundation:
Plain concrete
Continuous pad foundation
Reinforced concrete
Combined pad foundation
Pad and ground beam foundation
Design of pad footing – pad foundation spread the load of superstructure to the soil.
Therefore it is designed stiff so as to pressure foundation not to outstrip the permissible
bearing stress.
This is done with the help of reinforcement of pad. The angle at which it spread the load
is found using the soil bearing capacity and strength of concrete. Moreover the size of the
pad must prevent under tension so as no any cracking is developed in the foundation,
which shall cause failure of foundation as well as its structure.
How depth up to which footing can resist the punching shear, is the depth of the footing.
Also it depends upon the bending factor. Pad foundation all arrangement is on the basis
of “load bearing capacity of the soil”.
A pad foundation of size 800x800x400 deep is designed with a reinforcement of 8N16
both ways. The supporting column of square size 400x400 is constructed with a
reinforcement of 4N24 with R8 ties @250 crs . The ground level touches the top surface
of the footing.
For pouring, two pour is poured one for pad footing and one for column. A 50mm cover
is provided below ground of footing and 40mm cover above the ground.
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