fathima - Questions

Centring of the column is done during the placing of layout on-site with the help of rope and plumb Bob.

For the construction of column following are the steps performed,

1. Column layout
2. Reinforcement of column
3. Column formwork
4. Concrete pouring

Centring of the column is done with the help of plumb bob and rope. Plumb Bob placed vertically from the top of rope point and it touches to the ground. Mark the point where plumbob touch the ground and done the PCC work.

What checking the vertical alignment, old a plumb bob at the top at any one edge of the column and inspect the plumb Bob is vertically straight and just touch the bottom offset of the column. If plumb Bob is inclined at some angle, then check its inclination where it shows the column is not vertical and inclined by some angle.

The column stiffener is used for providing additional support to the columns at the beam connection location. Column Stiffeners provided when the column strength is exceeded but to get the desired strength moment of the beam section.

Use of column stiffener:

Column stiffeners are the second section or plates which are used as an attachment for the flanges and beam webs which stiffen them against plain deformation.

• Stiffeners are used to control local buckling.
• It is used to connect bracing and transverse beams.