3. A sign structure in the Brooklyn-Queens Expressway is to be designed to resist a wind force that produces a moment of 25 k-ft in one direction. The axial load is 30 kips. Soil conditions consist of a normally consolidated clay layer with following properties, su-800 psf, and Ysat-110pcf. Design for a FOS of 3. Assume frost depth to be 3ft. 4. A single boring was taken at a site with the corrected N values shown below (table). Calculate the ultimate bearing capacity of the 10'x10' foundation at a depth of 4'. The groundwater is 2 feet below grade. You may assume the average unit weight of the soil above the water table is 125pcf and the saturated unit weight is 134pcf. Depth (R) 369 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 6972 75 78 10 12 11 26 25 24 26 24 26 20 22 24 24 25 23 24 25 26 24 24 25 23 24 25 26 24 SPT corr 5. For the foundation shown, estimate the stress increment Ao at a depth of 20', directly under points A and B using the a) 2:1 approximate method and b) Boussinesq. Exton 20 View