A 300 mm concrete wall supported a dead load of 210kN/m and a live load of 145kN/m The allowable soil bearing pressure is 210kPa. The wall footing has an effective depth of 225 mm and a total depth of 300 mm. The bottom of the footing is 1.2 m below the grade. Use fc' = 20.73MPa, fy = 276.5MPa. Assume concrete weighs 23.5 kN/m3 and that of soil is 15.7 kN/m3. a. Determine the width of footing b. Determine the value of the bearing pressure for strength design of the footing caused by the factored load? c. Determine the nearest value of the required moment for strength design d Determine the design shear strength per meter of wall

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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.