Consider two axially loaded columns of grade 50 steel (σyp = 50 ksi ~ 345 MPa) with section W10 x 112. One of the columns is 12 ft (~ 3.6 m) long and the other is 40 ft (~12.0m). Both columns are braced at their pinned ends. a) Using the AISC ASD formulas, determine the allowable loads of these columns. b) Using the AISC LRFD method, determine the nominal axial resistances of the columns (factored loads) Pn = ϕC A σCR, where A is the cross-sectional area for each column.

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Design criteria for structural loading

The different loads such as loads due to self-weight (dead load) and external loads such as live load, wind loads, seismic load, snow load, and other loads and load combinations that influence the design of a building are called structural loading. The nature of the applied load differs from changes in the location, design, and type of materials used. The design criteria require that structures must be designed and constructed to be able to withstand all load types that are expected to act upon the structure and render its usage for the designated purpose. The structural members such as beams, slabs, columns, and foundations help the structure to withstand the applied load. There are different institutes such as ASCE and ACI that provide building design codes to assure minimum safety requirements and quality of the structures.