Design a combined footing, shown in Figure 15.a, to support two columns A and B spaced at a
distance of 4.0 m center-to-center. Column A is 40 cm 40 cm and carries a dead load of 80 tons
and a live load of 40 tons. Column B is 30 cm 30
Design of Combined Footings
Summary of combined footing design is shown in the following steps.
1- Select a trial footing depth.
2- Establish the required base area of the footing:
Uniform soil pressure is achieved by making the resultant of the servic