A 500 mm square concrete column carries a factored ultimate vertical column load of780 kN. The vertical service load is 650 kN. It is to be supported on a square footing withf′ c = 17 MPa and fy = 420 MPa. The soil has an allowable bearing pressure for bearing cap-acity of 650 kPa (based on LRFD methods) and an allowable bearing stress for settlement of 160 kPa. The groundwater table is at a great depth. Determine the required footing width, thick-ness, size of the flexural reinforcement, and show your design in a sketch.

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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.