Reinforcement detailing of Columns from ETABS output

AIM: Reinforcement detailing of columns in Etabs 2018.

GIVEN DATA: The ETABS file for a G+4 building is provided. Run the analysis and design of the RCC Moment Resisting Frame.

INTRODUCTION:

QUESTIONS:

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 Ashear reinforcement & lapping details as per the special confining reinforcement provision of clause 8.1 of IS 13920 - 2016.

DETAILING RULES:

1. Min. reinforcement for shrinkage and temperature.
2. Reinforcement req. for limiting crack width.
3. Ultimate limit state design rebar req.
4. Ductility rebar req.

Whichever is greater from the above 1-4 should be considered.

• Min. longitudinal reinforcement as per IS 13920 2016, clause 6.2.1; As = 360mm²
• Min. shear reinforcement as per IS 456 2000, clause 26.5.1.6(Assuming 1000mm spacing formula); Asv = 332mm²
• Development length as per IS 456 2000, clause 26.2.1; Ld = 41 x Diameter of the bar

PROCEDURE:

• Open the G+4 ETABS file which was provided by the skill lync in the previous challenge.
• Now select the particular two columns which are to be designed.
• From the view menu, change the view settings to only the selected objects.
• Now open the elevation of the building along the third grid.
• Now, run the program to get the reinforcement details.
• We can obtain the longitudinal and shear reinforcement requirements for both columns.
• Please have a look at the below snips for more clarity.
• The sectional plans of the columns are given below in the results section.

SNIPS:

RESULTS:

1. The reinforcement details of both the columns are almost very similar to each other. So below is the drawing of the reinforcement details in a sectional view of the column along the 3A and 3B grids.
   
2. The shear reinforcement spacing details can be seen clearly in the above diagram, while the plan view of it and the lapping details are shown below.