Chapter 7, Problem 7.11QPP

A bearing wall carries a factored ultimate vertical load Of 67 k/ft. It is to be supported on a 13 in deep continuous footing. The underlying soils are medium sands with $c\text{'}=0,\varphi \text{'}=37°,$ and $\gamma =124{\text{lb/ft}}^{\text{3}}.$ The groundwater table is at a great depth. Using LRFD, with a resistance factor 0.45, compute the minimum footing width required. Express your answer to the nearest 4 in.