6.3 Design of trapezoid-shaped footings The forming and reinforcing steel for a trapezoid footing is somewhat awkward to A= a+b place. 2 ■ With x'falling at a L 2a+b particular location and x'- 3 a+b defining the center of area,the dimensions a L and b have unique 3 2 values that require a simultaneous solution of Eqs.(6.1)and(6.2).6.3 Design of trapezoid-shaped footings ▪ The forming and reinforcing steel for a trapezoid footing is somewhat awkward to place. ▪ With x’ falling at a particular location and defining the center of area, the dimensions a and b have unique values that require a simultaneous solution of Eqs.(6.1) and (6.2). 3 2 2 3 2 L x L a b L a b x L a b A    + +  = + =