For a certain soil the cohesion is 50 kPa, the unit weight is 19.2 kN/m, angle of friction is 10 1. Assuming local shear failure, calculate the net ultimate bearing capacity in kPa for a strip footing of width = 4.5 m at a depth of 4.5 m. Terzaghi's ultimate bearing capacity equation for strip footing is given by qu = c'Nc' + YDfNq' + 0.5YBNY' with Nc' = 7.5, Nq' 1.8, NY' 0.48 2. Considering general shear failure, calculate the net ultimate bearing capacity on a square footing 4m x 4m using a load factor of 2.5 m. using Nc 9, Nq 2.5, Ny = 1.2 3. Compute the net allowable load on the square footing

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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.