Reinforcement detailing of Columns from ETABS output

Question:

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.

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.

Answer:

Aim:-

To Provide details of Longitudinal and Shear reinforcement for the two columns from foundation to terrace level and sketch the column cross sectional & elevation details.

Procedure:-

Step 1:-

• Open a Etabs file given in the Week 7 Challenge.

• Click Run Analysis to see the detail of Concrete Frame design.

• Click the Concrete Frame Design tool.

• Select the Display Design Info option.
• Choose design output as Longitudinal Reinforcement.
• It starts to checking the design.

Step 2:-

• After Selecting the Longitudinal Reinforcement click Elevation View at Grid 3.

• To avoid the confusions click tick mark on ribbon and uncheck beam.

• We can see the Longitudinal Steel requirement details in the model.

Step 3:-

• Now need to calculate the reinforcement details of 3a and 3b.

Step 4:-

• For Shear reinforcement, Click the Concrete frame design tool.
• Choose Shear Reinforcing.

• Click apply and ok.
• We can see the Shear Steel requirement details in the model.

Step 5:-

GRID A:

• From Base to first floor the maximum Longitudinal Ast is = 7027
• So we can provide 10nos of 32mm dia bar = 10 x 804 = 8040mm².
• From First floor to Terrace the maximum Ast is = 4800
• So, We can provide 4nos of 32mm dia bar = 4 x 804 = 3216mm² and 4nos of 25mm dia bar = 4 x 490 = 1960mm².

GRID B:

• From Base to Terrace the maximum Ast is = 5046
• So we can provide 8 nos of 32mm dia bar = 8 x 804 = 6432mm².
• Therefore it can be satisfied entire span.

Result:-

• Longitudinal and Shear reinforcement details provided successfully for the Columns 3A and 3B.