Two footings rest in a layer of sand 2.7 m thick. The bottoms of the footings are 0.90 m below the ground surface. Beneath the sand layer is a 1.8 m thick clay layer. Underneath the clay layer is solid rock. Water table is at a depth of 1.8 m below the ground surface. Refer to the figure shown. P= 400 kN P2 = 900 kN 0.9m

Steel is an alloy of iron. It is formed by heating iron and combining carbon (0.1-1.7%) with it and minor amounts of other elements such sulfur, chromium, manganese, nickel, etc. Thousands of steel grades have been published, registered, or regulated ar…