A concrete column 4m high and 400×200mm in section is reinforced with six No.20mm diameter steel bars.Calculate 1.Safe axial  load that can be applied to the column if the permissible stresses are limited to 7KN/mm2 for concrete and for steel.  2.Change in length that will take place in the column under this load.Young modulus steel =210KN/mm2 and concrete =14KN/mm2.

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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.