A continuous footing installed at a depth of 3 feet with base of 4 feet wide is constructed on cohesionless soil with a unit weight of 125 lb/ft and an angle of internal friction of 31°. The factor of safety requirement for the design is 2. The water table is sufficiently below the base of the foundation that won't interfere with the design. Determine: 1. Allowable bearing capacity (9₁) 2. Allowable wall load in lb/ft. Plb

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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.