Problems on Structural Design of Combined Footings
a. Two columns 50 cm x 50 cm in size support service loads of 1200kN and 800kN.The centre to centre spacing between columns is 5.5m. It is specified that the sides of the footing should not project beyond the edges of the column. Explain why rectangular footing is not possible if the pressure distributionis to be uniform under the footing.
b. In the above case, safe bearing capacity of the soil is 200 kPa. The self weight of the footing is 200 kN. Determine the dimensions of the footing.