A two story office building has interior columns spaced 25 ft apart in two perpendicular directions. The columns are fixed at the roof, the second floor and the ground floor in both directions. Consider the dead load (6 inch-thick reinforced concrete slab at the roof and 8 inch thick reinforced concrete slab at the floor) as well as appropriate live load. Ignore other dead weight other than shown. Determine the following using A992 steel:  1) Dead load and live load supported by interior column at ground level 2) Select the most economical W12 section for the interior column at ground level

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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.