A square foundation is 1.5 m by 1.5 m in plan with other characteristics shown in the figure. The soil supporting the foundation has a friction angle ø = 20° and c = 15.2 kN/m?. The unit weight of the soil is 17.8 kN/m³. Determine the allowable gross load on the foundation with a factor of safety of 4. Use general shear failure with Nc = 17.69 ; Nq = 7.44 ; Ny = 3.64 %3D Qall Y = 17.8 kN/m3 e = 0.60 D;= 1.0 m Gs = 2.65 GWT D= 0.4 m

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A: i hope its helpfull.thank you.

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A: B = 1.75m P = 400 kN Df = 1 m N60 = 12

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.