A rectangular footing is designed to carry an allowable load of 580kN with its weight inclusive. The bottom of the footing is 1m below the ground surface and the water table coincides with the bottom of the footing. Assume general shear failure. Given, γ=18kN/m^3, c = 25kPa, γ_sat=21.5kN/m^3. Use Nc = 35, Nq = 22, Ny = 19. Determine the width B of the footing using FS = 3.0 if B/L = 0.5

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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.