Chapter 11, Problem 11.3P

Repeat Problem 11.1 based on LRFD using the following factors:

load factor for dead load = 1.25

load factor for live load = 1.75

strength reduction factor on the ultimate bearing capacity = 0.50

11.1 A continuous foundation is required in a soil where $c^{\prime }=10\text{kN}/{\text{m}}^{\text{2}}$, ${\varphi }^{\prime }=26°$, and $\gamma =19.0\text{kN}/{\text{m}}^{\text{3}}$. The depth of the footing will be 1.0 m. The dead load and the live load are 600 kN/m and 400 kN/m, respectively. Determine the required width for the foundation based on allowable stress design with FS = 3, using Eq. (6.10) and Table 6.1.