Three parallel strip footings 3m wide each and 5m apart center to center transmit line loads of 300, 200, and 100 kN/m respectively. Calculate the vertical stress due to the combined loads beneath the center of each footing at a depth of 4m below the base. Assume footings are placed at a depth of 2m below the ground surface. Use Boussinesq's Method for line loads.

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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.