Reinforcement detailing of Columns from ETABS output

Aim:  

• To run the analysis and design the RCC moment resisting frame of the given ETABS file
• To sketch the column cross sectional & elevation details or draft it using AutoCAD software.
• To 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. Basic or advanced systems under static or dynamic conditions may be evaluated using ETABS. Interoperability with a series of design and documentation platforms makes ETABS a coordinated and productive tool for designs which range from simple 2D frames to elaborate modern high-rises.

Procedure:

Step 1:

• Open the challange 7 attachment which are provided to us 
• After downloading open the Challenge open it in the Etabs software.

Step 2:

• Select the 3A and 3B columns  from all stories as shown below

• Right click on the document and select show selected objects only

• Selected objects will be displayed as below

Step 3:

• Select the elevation option from menu and click which grids to be viewed and run the analysis.

• Now we have to start the column design by selecting the "concrete frame design" as below

• Below is the longitudinal reinforcement of the columns 3A and 3B after run the analysis

1. Longitudinal reinforcement 3A:

2. Shear reinforcement 3A:

Detail reinforcement of the column is shown below

1. Grid 3A:

 From Base to first  floor,

                                 Ast = 7027 mm2

 So provide 8 nos of 32 mm diameter bar = 8 x 803.84

                                                            = 6430.72 mm2

 also provide 2 nos of 20 mm diameter bar = 2x314

                                                              = 628 mm2

 8 nos of 32 mm+2 nos of 20 mm = 6430.72+628

                                                  =7058.72 mm2>7027 mm2 (OK)

Details of column at grid 3A:

1. Longitudinal reinforcement 3B:

2. Shear reinforcement 3B:

Detail reinforcement of the column is shown below

2. Grid B:

 From Base to Terrace floor,

                                        Ast = 5046 mm2

 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

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 (OK)

Diagramatical Details of 3B Grid is shown below 

• Typical Beam column Joint as per special confining reinforcement provision of clause 8.1 of IS 13920 -2016,As per IS 13920 - 2016 at beam column junction.

Conclusion: From the challenge carried out it can be concluded that the concept of design of RC column using ETABS Software and the concept of ductility reinforcement by IS – 13920 – 2016 is satisfied in ETABS.

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