Reinforcement detailing of Columns from ETABS output

Aim – To provide reinforcement detailing of columns in Etab.

Procedure –

Step 1 –

• Open the G+4 Etab file in software
• After that check the model and Run the analysis

Step 2-

• Click on concrete frame design tool and click design info option
• Select longitudinal reinforcement as design output

• After selecting the longitudinal reinforcement click on elevation view and select the elevation view then click Apply and Ok

Step 3 –

• Click on concrete frame design tool and in that select display design info option and then select shear reinforcement as design output then click Apply and Ok

• After selecting the shear reinforcement option the shear reinforcement values are obtained

Step 4 –

• Calculate the reinforcement details for Grid 3A –
• The maximum Ast of column 3A from base to first floor = 7027 mm^2
• Provide 10-32mm dia bars = 10*804 = 8040 mm^2
• The maximum Ast of column From first floor to terrace = 4800 mm^2
• Provide 6-32mm dia bars = 6*804 = 4824 mm^2

Step 5 –

• Calculate the reinforcement details for grid 3B
• The maximum Ast of column 3B = 5046 mm^2
• Provide 8-32 mm dia bars = 8*804 = 6432 mm^2

• Longitudinal reinforcement -

As per clause 7.1.1 of IS 13920,minimum dimension of column shall not be less than-

1) 20 db,where db is diameter of largest dia of longitudinal reinforcement bar in beam passing through or anchoring into the column at the joint

2)300mm

• Transverse reinforcement –

1) For shear reinforcement,the closed link should have 135 degree hook end with an extension of 6 times its diameter(but not less than 165mm)at each end,which are embedded in the confined core of concrete column.

• Special confining reinforcement –

1) Length of column Larger than lateral dimension of column

2) 1/6 height of column

3) 450mm

• Spacing of links should not be more than-

1) 1/4 of minimum dimension of column or beam

2) 6 times diameter of smallest size of longitudinal bar

3) 100mm