Outdoor storage containers for a manufacturing facility impose a total loading of 5,500 kN when full. The storage containers will be supported on a concrete pad foundation constructed near the soil...

Outdoor storage containers for a manufacturing facility impose a total loading of 5,500 kN when full. The storage containers will be supported on a concrete pad foundation constructed near the soil surface. Space constraints require the foundation to have a length twice the width. The soil at the site is a clay; undrained shear tests indicate that the cohesion c is 105 kPa (the angle of internal friction is zero). The soil rigidity index is 60. Determine the required foundation size based on the extended bearing capacity equation and a factor of safety of 3.