An 8 in diameter drilled shaft will penetrate through an expansive stiff clay to a depth well below the active zone. It will carry a downward load of 5,200 lb. The undrained shear strength of the clay is 900 psf and the active zone extends to a depth of 10 ft. Determine the following: What is the uplift skin friction load? Is a tensile failure in the shaft possible (do not forget to consider the weight of the shaft)? assume: unit weight concrete = 150pcf, Concrete has no tensile strength. Assume full active zone in calculations.

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Load and resistance factor design

Load and resistance factors design (LRFD), also known as Limit state design (LSD), refers to the design method used in building engineering. A boundary condition is a condition of a structure where it can no longer meet the relevant design requirements. The condition may refer to the load level or other actions on the structure, while the terms refer to the integrity of the structure, suitability for use, durability, or other design requirements. A structure designed for LRFD is limited to keeping track of all possible actions during its design time and is always ready for use, with the appropriate level of reliability in each boundary condition. LRFD-based construction codes clearly define the appropriate levels of reliability in their instructions.