Reinforcement detailing of Columns from ETABS output

* Reinforcement detailing of columns in Etabs 2018 *

Q :- 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 :-

With reference to IS 13920-2016, we must use etabs to analyse and redesign the RCC moment resisting frame in two columns at the following grid intersections 3A and 3B in the supplied E-Tabs project.

INTRODUCTION :-

We describe the longitudinal reinforcement of two columns in the modal and present shear reinforcement and lapping details in accordance with the unique confining zone of paragraph 8.1 of IS 1920-21016.

PROCEDURE :-

STEP 1) Open the Given Model

• Model open in etabs software
• Check the model

STEP 2) Column Analysis

• Select the column intersection 3A & 3B from terrace to foundation
• Click on run analysis it will show the max. & min. deflection at the bottom

STEP 3)

• Reinforcement Detailthe icon for the concrete frame design
• It will display the column's longitudinal reinforcement.
• Select the grid 3's elevation view.
• Click on the display design info button after lowering the concrete frame design icon.
• choose the display's shear reinforcement. concrete frame construction

STEP 4) Reinforcement Design

• Longitudinal reinforcement & shear reinforcement of column at Grid-3A & 3B from ETABS (450X650)

Storey Elevation of column :-

Special confining reinforcement from IS-13920-2016(Clause 8.1) :-

Lo not less than :-

1. Larger column dimension
2. 1/6 of clear span of column
3. 450 mm

Confinement spacing not more than :-

1. ¼ of smaller column dimension
2. 6 times of dia of column main bar
3. 100 mm

The amount of confinement rebar :-

Ash = 169 mm^2

• Typical column reinforcement section and elevation for grid 3A & 3B
• Provide some additional confining reinforcement 8mm @100mm C/C
• Used 8mm dia stirrups at 200mm spacing in center
• Used 2 closed stirrups (2legged) and 1 open link (stirrups)

RESULT :-

• Successfully completed the designing and detailing of gave the details of column reinforcement at grid 3A and 3B from foundation to terrace level in accordance with IS 13920:2016 clause 8.1 and drew the cross section and elevation in AutoCAD programme.