Reinforcement detailing of Columns from ETABS output

Reinforcement detailing of columns in Etabs 2018.

The ETABS file for a G+4 building is provided. Run the analysis and design the RCC Moment Resisting Frame. The following challenge deals specifically with two columns at the following grid intersections. Ans:

1. 3A
2. 3B

• Provide details of longitudinal reinforcement for the two columns, from foundation to terrace level. Sketch the column cross sectional & elevation details or draft it using autocad software.
• Show shear reinforcement & lapping details as per special confining reinforcement provision of clause 8.1 of IS 13920 - 2016.

Ans:

Step-1: Open G+4 model file and check the model and analyze the model

Step-2: Click the Concrete Frame Design tool

Step-3: Select the Display Design Info option Choose design output as Longitudinal Reinforcement

Step-4: After Selecting the Longitudinal Reinforcement click Elevation View

Step-5: To avoid the confusions click tick mark on ribbon and uncheck beam

Step-6: Now need to calculate the reinforcement details of 3A and 3B

Step-7: For Shear reinforcement, Click the Concrete frame design tool

Step-8: Choose Shear Reinforcing Click apply and ok.

Step-9: After selecting the Shear reinforcement option the shear reinforcement values are obtained at each column.

Step-10:

Grid-A: From Base to first floor the maximum Ast is = 7027

So we can provide 10nos of 32mm dia bar = 10 x 804

= 8040mm^2

From First floor to Terrace the maximum Ast is = 4800

So, We can provide 6nos of 32mm dia bar = 6 x 804

= 4824mm^2

Grid-B: From Base to Terrace the maximum Ast is = 5046

So we can provide 8 nos of 32mm dia bar = 8 x 804

= 6432mm^2

So it can be satisfied entire span.