Footing Upward Pressure Context
Upward soil pressure represents the force exerted by the soil directly beneath the footing, acting upwards against its base.
This pressure is fundamentally determined by the total downward load applied over the footing's base area.
Load Components for Pressure Analysis
The total downward load typically comprises:
- The load originating from the structure supported by the footing (e.g., column load).
- The self-weight of the footing itself.
In many standard engineering calculations, the upward soil pressure is derived from the sum of the structural load and the footing's self-weight.
Analyzing the Provided Statement
The statement "The self-weight of the footing is not considered for calculating the upward pressure on footing" suggests a specific scenario. This might refer to calculating the pressure exerted solely by the external structural load, isolating it from the footing's own weight for that particular calculation step or context.
Based on this interpretation:
- The statement is considered true within this specific context, focusing only on the external load component.
- Other options are evaluated against this context: The idea that self-weight is always included (Option 2) contradicts this specific focus. Option 3 is about footing area, not pressure calculation. Option 4 is incorrect because a valid statement within the implied context exists.
Important Questions from Footings
For a number of columns constructed in a row, the type of foundation provided is
If p is the net upward pressure on a square footing of side b for a square column of side a, the maximum bending moment is given by
A. \({\rm{B}}.{\rm{M}} = \frac{{{\rm{pb}}\left( {{\rm{c}} - {\rm{a}}} \right)}}{4}\)
B. \({\rm{B}}.{\rm{M}} = \frac{{{\rm{pb}}{{\left( {{\rm{b}} - {\rm{a}}} \right)}^2}}}{4}\)
C. \({\rm{B}}.{\rm{M}} = \frac{{{\rm{pb}}{{\left( {{\rm{b}} - {\rm{a}}} \right)}^2}}}{8}\)
D. \({\rm{B}}.{\rm{M}} = \frac{{{\rm{pb}}\left( {{\rm{b}} + {\rm{a}}} \right)}}{8}\)
_______ is provided to support an individual column. It is circular, square or rectangular slab of uniform thickness Sometimes it is stepped or haunched to spread the load over a large area.
The minimum nominal cover to reinforcement for R.C.C. footings as per IS: 456-2000 shall be
For a proposed building, raft foundation, isolated footings and combined footings are being considered. These foundations are to be listed in the decreasing order of preference in terms of performance. Which one of the following is the correct order of listing?
