Reinforcement detailing of Columns from ETABS output

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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 Providing details of longitudinal reinforcement for the two columns from foundation to terrace level.

PROCEDURE:

Initially open the ETABS software with the given ETABS file.

Then carry out the analysis of the model after checking it.

Once the analysis is complete next we have to carry out the design.

For this initially go to concrete frame design in the tabs provided at the top.

Go to Concrete frame design, then Design preferences.

Go to Concrete frame design, then Design combinations.

Go to Concrete frame design, then Start design check

Go to Concrete frame design, then Display design info, then longitudinal reinforcement.

Go to Concrete frame design, then Display design info, then shear reinforcement.

Now, we need to draft the column reinforcement details on an AutoCAD.

The reinforcement details for the column 3A is given as:

• Here the maximum longitudinal reinforcement required is 7027mm^2.
• Provide 8 no of 32mm dia bars and 2 no of 20mm dia bars which together contributes an Ast of 7060 mm^2
• For shear reinforcement, the maximum reinforcement area required is 720 mm^2
• Provide 10mm dia bars@ 150mm c/c at zone A and a spacing of 100mm c/c at zone B ( at splicing location and near the beams) which contributes to an Ast of 1570 mm^2 and 2355mm^2 respectively.

The reinforcement details for the column 3B is given as:

• Here the maximum longitudinal reinforcement required is 5046mm^2
• Provide 4 no of 32mm dia bars and 6 no of 20mm dia bars which together contributes an Ast of 5100 mm^2
• For shear reinforcement, the maximum reinforcement area required is 720 mm^2.
• Provide 10mm dia bars @ 150mm c/c at zone A and a spacing of 100mm c/c at zone B ( at splicing location and near the beams). which contributes to an Ast of 1570 mm^2 and 2355mm^2 respectively.

RESULT:-

• The given Etabs model has been analysed after checking the model.
• Then concrete frame design has also been carried out hence the reinforcement area required has been obtained.
• The longitudinal reinforcement details obtained from the results have been drafted in AutoCAD software.
• Similarly the shear reinforcement detiakls also have been drafted.