A flat slab is supported by 18"x18" columns spaced at 26 ft in both directions. The slab is 10" and has a concrete strength, F'c = 5000 psi and reinforcement having a yield strength Fy = 60,000 psi. The slab is subjected to a factored load qu = 260 psf (including self weight of the slab). Determine the following: a) The width of the column strip and middle strip b) The design moment for the column strip at the typical interior bay at the column and at midspan c) Check punching at a typical interior column. The total moment transferred to the column is 50 k- ft.

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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.