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. 

Ans.

Aim:-

• To provide the detils of longitudenal reinforcement for two column (3A & 3B), from foundation to terrace level.
• To provide the details of shear reinforcement as per special confining reinforcement provision of clause 8.1 of IS 13920 - 2016.

Introduction:-

• A reinforced concrete column is a structure member designed to carry compressive loads, composed of concrte with an embeded steel frame to provide reinforcement.
• For deisgn purpose, the columns are seperated into two categories : short column and slender columnss.
• A short column is a structure member whose relative short length virtualy ensure it will fail in compression if evenly loaded on axis.
• Cloumn can be easily classified as Short, itermediate , long depending upon their length, their material properties, and length of other column in same strcuture.
• A slender column is a thin column, for any construction, foundation starts making the position of columns and then design & anaylsis.
• Slender column can be tested in lab to observe the action of buckling and cripping. For column based on slenderness ratio is termed as long or short column.

Procedure:-

Step 1:

• First we have to open the challenge 7, and download it.
• Open challenge in ETABS 

Step 2:

• Now put model in elevation view as shown below

Step 3:

• Start design by selecting Start design/ Check option

Step 4:

• Design longitudnal reinforcement

Step 5:

• Select Display Design info, select shear reinforcement design output and then click on OK button
• Shear reinforcement will be displayed as hown below

Step 6:

• Shear reinforcement will be dislayed as shown below

Step 7:

• Now, here column-7 (3A intersection), we take size of column is 450X650 mm.
• Max. Ast for column-7 is 7027sq.m.
• Now we will provide 16bars with18mm dia (16-18ø) as shown below
• Provide stirrups as 10mm, for Zone A we provide 100mm spacing and for Zone C provide 150mm spacing, as shown below
• Deatil of shear reinforcement are provided as per special confining reinforcement provision of clause 8.1 of IS 13920-2016.

Step 8:

• Here column-8 (3A intersection), we take size of column is 450X650 mm
• Max. Ast for column-8 is 5046sq.m.
• Now we will provide 16bars with 20mm dia (16-20ø) as shown below
• Provide stirrups as 10mm, for Zone A we provide 100mm spacing and for Zone C provide 150mm spacing, as shown below
• Deatil of shear reinforcement are provided as per special confining reinforcement provision of clause 8.1 of IS 13920-2016.

Result :-

• Provided the details od longitudnal reinforcement of two column (3A & 3B) successfully, from foundation to terrace level.
• Provided with deatiling of shear reinforcement as per special confining reinforcement provision of clause 8.1 of IS 13920 - 2016. 
• Provided with cross section of column & elevation using AutoCAD software.