Reinforcement detailing of Columns from ETABS output

Aim:

To Providing details of longitudinal reinforcement for the two columns from foundation to terrace level.

Step 1:

1) Open a G+4 Etab file

2) Click the Concrete Frame Design tool

3) Select the Display Design Info option

4) Choose design output as Longitudinal Reinforcement

Step 2:

1) After Selecting the Longitudinal Reinforcement click Elevation View

2) To avoid the confusions click tick mark on ribbon and uncheck beam

Step 3:

1) Now need to calculate the reinforcement details of 3a and 3b

Step 4:

1) For Shear reinforcement, Click the Concrete frame design tool

2) Choose Shear Reinforcing

3) Click apply and ok

Step 5:

1) After selecting the Shear reinforcement option the shear reinforcement values are obtained at each column.

Step 6:

GRID A:

From Base to first floor the maximum Ast is = 7027 mm2.

So we can provide 8 no's of 32 mm diameter bar = 8 x 803.84

= 6430.72 mm2.

also we can provide 2 no's of 20 mm diameter bar = 2 * 314

= 628 mm2.

8 no's of 32 mm+2 no's of 20 mm = 6430.72+628

=7058.72 mm2>7027 mm2. ........hence okay

GRID B:

From Base to Terrace floor the maximum Ast = 5046 mm2

So , Provide 8 bars of 25 mm diameter for the column = 8 x 490.87*8

= 3927mm2

Provide 2 bars of 32 mm diameter for the column = 4 x 314.16

= 1607.68mm2

Therefore;

Provide 8 bars of 25 mm diameter for the column + Provide 4 bars of 20 mm diameter for the column =

= 3927 + 1607.68

= 5534 mm2>5046 ...........hence okay