Reinforcement detailing of Columns from ETABS output

Objectives of the Challenge:

• To know the design of the RC column using ETABS analysis.
• To know the basics of RC column reinforcement detailing with respect to primary standards.
• Ensure the ductility reinforcement required by IS-13920-2016 has been satisfied in the reinforcement drawing.

Detailing rule of any Reinforced concrete member:

Whichever is greater in the following, Should be drawn in the RC column detailing

1. Minimum Reinforcement for shrinkage & temperature.
2. Ultimate limit state design rebar requirement.
3. Ductility rebar requirement.

• Minimum longitudinal reinforcement as per IS-456-2000 clause 26.5.3.1 As = 2340 mm^2
• Minimum shear (or) transverse reinforcement as per IS-13920-2016 clause 7.4.2 - 8mm dia at 300mm spacing.
• Development length as per IS-456-2000 clause 26.2.1 Ld = 41 x diameter of the bar

Procedure:

• Open the analyzed file which we did in the last challenge.
• Go to Elevation view of 3.
  
• Now design the concrete frames.
• Longitudinal reinforcement for columns 3A and 3B:
  
  Shear reinforcement for columns 3A and 3B:
  
• In the challenge, they asked us to provide reinforcement details from the foundation to the terrace. For that purpose, the below data is required:
  
• Special confining reinforcement from IS 13920-2016:
  Clause 8.1
  
• Io, not less than:
  1. Large column dimension
  2. 1/6 of the clear span of the column
  3. 450mm
     • 650 mm
       
       
• Confinement spacing, not more than
  • 1/4 of the smaller column dimension
  • 6 times of dia of column main bar
  • 100 mm
    • 100mm
• The amount of confinement rebar:
  
  • 
    • 169 mm2

Detailed AutoCAD sketch of Columns 3A and 3B:

Detailing of the columns is done.