A trapezoidal combined footing for two axially loaded columns is provided when
1. Width of the footing near the heavier column is restricted.
2. Length of the footing is restricted.
3. Projections of the footing beyond-the heavier column are restricted.
Select the correct answer using the codes given below:
Combined footing supporting two columns may be used for column on property lines or sewer line. In this case load will be eccentric.
While designing combined footing the resultant of the column loads passes through the centre of gravity of the footing slab such that the net soil pressure obtained is
In R.C. footing on soil, the thickness at the edge should not be less than
According to the Code (Ci. 34.1.2) restricts the minimum thickness at the edge of the footing to 150 mm for footings in general (and to 300 mm in the case of pile caps).
A strap footing is a special type of
A strap footing consists of a spread footings of two columns connected by a strap beam. This type of footing is useful when the external column is very near to the property line so that its footing cannot be spread beyond the property line.
If the foundations of all the columns of a structure are designed on the total live and dead load basis, then
The ratio of live load to dead load is greater in the case of interior column as compared to that in exterior column.
The critical section of finding maximum bending moment for footing under masonry wall is located
In the case of isolated square concrete footing, match the locations at which the stress resultants are to be checked, where d is effective depth of footing and select the correct answer using the codes given below the lists:
A. Bending moment
B. One way shear
C. Punching shear
1. At face of column
2. At d/2 from face of column
3. At d from face of column
For footings on piles the critical section for one way shear is d/2 from the face of the wall.
For footing minimum cover should be
See IS 456 : 2000 Clause number 26.4.