Which of the following statements is INCORRECT in relation to the RCC column design according to IS 456: 2000?
1
All columns shall be designed for minimum eccentricity equal to (Unsupported length of column/30 + Lateral dimensions/500) subject to a minimum of 30 mm.
2
If, in any given plane, one end of a column is unrestrained, its unsupported length, l, shall not exceed \(\rm \frac{100b^2}{D}\)(where b = width of that cross-section and D = depth of the cross-section measured in the plane under consideration).
3
The unsupported length between end restraints shall not exceed 60 times the least lateral dimension of a column.
4
The unsupported length, l, of a compression member shall be taken as the clear distance between end restraints.