Reinforcement detailing of Columns from ETABS output

AIM: 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.

INTRODUCTION: ETABS is an engineering software product that caters to multi-story building analysis and design. Modeling tools and templates, code-based load prescriptions, analysis methods and solution techniques, all coordinate with the grid-like geometry unique to this class of structure.

PROCEDURE:

1. Open the etabs file attached with the challenge.

2. Run analysis to the model in the etabs, it shows max and min deflection at left bottom corner.

3. Click on concrete frame design software automatically designs beams, columns. We can see the longitudinal reinforcement details of the first floor.

4. We can also see shear reinforcement by drop down the concrete frame design and selecting design info in that we select shear reinforcing and click apply.

5. Column at grid intersection 3A:

Max Ast = 7027 mm2

So providing 8 bars of 32mm= 6446 mm2

2 bars of 20mm =628mm2

Also provide 10mm stirrups with 150mm for zone C.

6. As the width is greater than 300mm confining reinforcement is provided in both the directions.

7. Column at grid intersection 3B:

Max Ast = 5046 mm2

So providing 8 bars of 28mm= 4920 mm2

2 bars of 12mm =226mm 2

Also provide 10mm stirrups with 150mm for zone C.

RESULT: Reinforcement detailing of columns is completed using the ETABS software.