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Concrete Lolly Column is a solid column that cannot be adjusted for security purposes. The post can be used in numerous situations to support up to 18,700 lb.

Explanation: Rankine formula is valid for both short and long column. Hence failure by, both crushing and buckling should be considered.

Explanation: Rankine's method defines the formula for deflection angle as ? = 1718.9 * C / R, where c is the chord length, r is the radius of the curve.

The axial load carrying capacity of a column is based on the formula Pu =0.4 fck Ac + 0.67 fy Asc as per IS 456-2000. Here in the Table P is Axial Load Carrying capacity of column in KN.

The critical load is the greatest load that will not cause lateral deflection (buckling). For loads greater than the critical load, the column will deflect laterally. The critical load puts the column in a state of unstable equilibrium. A load beyond the critical load causes the column to fail by buckling.

Load Calculation For Columns: Self weight of Concrete is around 2400 kg per cubic meter, which is equivalent to 240 kN. Self weight of Steel is around 8000 kg per cubic meter.

How to Load Calculation on Column? Volume of Concrete = 0.30 x 0.60 x 3 =0.54m³ Weight of Concrete = 0.54 x 2400 = 1296 kg. Weight of Steel (1%) in Concrete = 0.54 x 0.01 x 7850 = 42.39 kg. Total Weight of Column = 1296 + 42.39 = 1338.39 kg = 13.12 KN.

In conclusion, the correct answer to the question is option 'D', i.e., Rankine's formula for column is valid for columns of any slenderness ratio. However, the accuracy of the formula is affected by the slenderness ratio of the column, and it is most accurate for columns with slenderness ratios between 50 and 200.

Columns are defined as vertical load-bearing members supporting axial compressive loads chiefly. This structural member is used to transmit the load of the structure to the foundation. In reinforced concrete buildings beams, floors, and columns are cast monolithically.

The formula proposed by Rankine for columns of all lengths is known as Rankine's formula. The formula is 1/P = 1/PC +1/PE where PC is the crushing load, PE is the buckling load by Euler's formula.