By my rough estimate, your footings are inadequate to handle load of a G+2 building. If the underlying soil is hard rocky soil, we can assume a maximum safe bearing capacity of 35 tons per square meter. But a footing of size 3′ X 3′ has a maximum capacity of 28 tons as its area is 0.80 square meter. A general rough estimate puts load on a column and its footing at 15 tons to 20 tons per floor for reasonable spans like in your building. This can vary greatly and has to be calculated by a competent engineer. This means your footings are at capacity and the G+1 floors have already consumed available carrying capacity of a 3′ X 3′ footing.

I would recommend against building another floor.

]]>We constructed a G+1 building. Length 78ft, Width 27ft to 15ft (Land is not rectangle, front is 15ft, back is 27ft).

Now I am planning to build another story (make it G+2). But my dad is not happy with it since he constructed it for G+1. Following are the details of the building, please give me a solution whether can i go for an additional story.

There are 20 columns in total (8 columns per side, 4 columns from mid to back of the building, where the total width is more than 18 feet).

Foundation depth for each column is 6ft deep, 3ft x 3ft 12mm mesh for footing. Each column has 4 iron rods which are 12mm.

Soil is very solid and we had pour water in order to wet and loose it before digging.

All the columns are connected with beams, we have used 12mm rod for all beams. Only for 2 beams which are 16ft length, we have used 16mm in bottom, 12mm on top. 10mm rods are used for floor concrete for each story.

The column distance varies from 18ft to 8ft.

]]>what is the effect of having DIFFERENT LENGTH FOUNDATION for same building?

will STIFFNESS be an issue?

what about Lateral force or EARTH QUAKE?

what is the remedy for this type of problem?

PLEASE recommend me reading material on this topIC

Thanx!!!! ]]>

Regards ]]>

Thanks. ]]>

Structural design depends on the location, soil and the design of the building. It is therefore not possible to answer this question. It would be best for you consult a structural engineer.

]]>