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Shallow Foundation – Structural Design. Page 52 of 53 A trapezoidal combined footing may be necessary if a rectangular combined footing. Design and detail a trapezoidal combined footing witlz bea~n for the data given in. Example 17.3. 17.4 DESKGN OF STRAP FOOTING. I strap footing is a co~ Step #1. The required design area A of a footing can be found from, Q1 + Q2 A= (1) qall net where Q1, Q2 are the loadsExample (11.6):. Design a combined footing, shown in Figure 15.a, to support two columns A and B spaced at a Try a trapezoidal combined footing. Design of combined foundation. – References Definition. ? Types of combined foundations View plan of Trapezoidal combined Footing. • Rectangular. For example if the required area = 6 m2, then: 6.11.1 Design of Rectangular Combined Footings 6.11.2 Design of Trapezoidal Combined Footings.