Question: A reinforced concrete column of 18"x18" size supports a service dead load of 120 kips and a service live load of 90 kips. The loads are acting at the base of the column. The allowable bearing capacity, qa, is 6000 psf at the level of the base of the footing, which is 4 ft below the finish floor level as shown in Fig. 03. Take fe' = 3 ksi and fy = 60 ksi. It is required to; (a) Analyze the footing. Take unit weight of soil equal to 120 pef) (b) Design the footing for flexure using #6 bar only. 18"x18" RC column FFL 4'-0" h= 21" Figure 03.

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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.