5.3 A short steel column supports an axial compressive load of 120,000# and is welded to a steel base plate resting on a concrete footing. a) Compute the area of steel por b. Determine the size of the base plate (square) required if the allowable bearing on concrete is 450 psi. c. Calculate the required size of footing (square) if the allowable soil pressure is equal to 3,000 psf. Neglect weights of column, base plate, and 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.