... 119 pcfExample 4. Design the steel lying in the East-West direction of the mat shown below with external dimensions of 42 feet by 74 feet. The columns are all 15”by 15”, the LF = 1.6, fc’ ... being designed for a small office building with a total live load of 250 kips and dead load of 500 kips. Find: (a) the depth Dffor a fully compensated foundation, (b) the depth Dfif a soft ... in the x and y values, which these values are found by using the x-y coordinate system off the mat foundation.Determine the average soil reaction.(92.34(78.8)69.8)796avgqpsf++∆==Therefore,...