Related Questions

If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth (D) of the footing from punching shear consideration, is
A $${\text{D}} = \frac{{{\text{W}}\left( {{\text{a}} - {\text{b}}} \right)}}{{4{{\text{a}}^2}{\text{bq}}}}$$
B $${\text{D}} = \frac{{{\text{W}}\left( {{{\text{a}}^2} - {{\text{b}}^2}} \right)}}{{4{{\text{a}}^2}{\text{bq}}}}$$
C $${\text{D}} = \frac{{{\text{W}}\left( {{{\text{a}}^2} - {{\text{b}}^2}} \right)}}{{8{{\text{a}}^2}{\text{bq}}}}$$
D $${\text{D}} = \frac{{{\text{W}}\left( {{{\text{a}}^2} - {{\text{b}}^2}} \right)}}{{4{\text{abq}}}}$$
Based on punching shear consideration, the overall depth of a combined footing under a column A, is
A $$\frac{{{\text{Area of the column A}} \times {\text{Safe punching stress}}}}{{{\text{Load on column A}}}}$$
B $$\frac{{{\text{Perimeter of column A}} \times {\text{Safe punching stress}}}}{{{\text{Load on column A}} + {\text{Upward pressure}} \times {\text{Area of column}}}}$$
C $$\frac{{{\text{Perimeter of column A}} \times {\text{Safe punching stress}}}}{{{\text{Load on column A}} \times {\text{Upward pressure}} \times {\text{Area of column}}}}$$
D None of these
In a combined footing for two columns carrying unequal loads, the maximum hogging bending moment occurs at
A Less loaded column
B More loaded column
C A point of the maximum shear force
D A point of zero shear force
Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than
A 42 diameters from the centre of the column
B 42 diameters from the inner edge of the column
C 42 diameters from the outer edge of the column
D 24 diameters from the centre of the column
In reinforced concrete footing on soil, the minimum thickness at edge should not be less than
A 100 mm
B 150 mm
C 200 mm
D 250 mm
To minimize the effect of differential settlement, the area of a footing should be designed for
A Dead load only
B Dead load + live load
C Dead load + fraction of live load
D Live load + fraction of dead load
Depth of lean concrete bed placed at the bottom of a wall footing, is kept
A 10 cm
B 15 cm
C Equal to its projection beyond wall base
D Less than its projection beyond wall base
To ensure that supporting area of an offset footing of a boundary wall is fully compressive, the C.G. of load must act
A At the centre of the base
B Within the middle third of the base
C Within the middle fifth of the base
D Neither (A), (B) nor (C)
The type of footing which is used to transmit heavy loads through steel columns is
A Raft foundation
B Grillage foundation
C Well foundation
D Isolated footing
Contact pressure beneath a rigid footing resting on cohesive soil is
A less at edges compared to middle
B more at edges compared to middle
C uniform throughout
D none of the above

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