A long strip footing foundation 1 m wide is to be designed for a region where earthquakes could occur. The soil underlying the area has a unit weight equal to 17 kN/m3, an angle of internal friction equal to 20°, and a cohesion value c equal to 25 kPa.

Assume that the footing will be installed at a depth of 1 m below the adjacent soil surface, that the soil rigidity index is greater than the critical index, and that the depth factors do not apply. For the condition where kh equals 0.20 and kv is half of kh, compare the value for static ultimate bearing capacity (Equation 1a) with the value for seismic bearing capacity (Equation 24 and Figure 20). For this problem, do not use a factor of safety when making the comparison.