Structural Modelling using Etabs 2018

AIM

The architectural drawings for a G+7 residential building in zone 5 has been provided. The floor plan is the same for all 7 floor levels. Possible column positions have also been provided. Conceptualize a framing plan layout and then model the building in Etabs. The following architectural drawings have been provided:

• Typical floor plan – The location and thickness of the brick walls and the use of the
  space (for estimating live load) can be obtained from this plan
• A building section through the staircase and lift core is provided
• Parking layout in the ground floor – the column/shear wall arrangement must not
  obstruct entry/exit of vehicles.
  The following loadings are to be taken into account:
• Brick Wall made of AAC blocks
• Finishes – floor tiles of 75 mm thickness
• Live loads as per IS 875 part 2
• Water tank of 20 KL above the staircase at Mumty level
• Lift Machine room at mumty level above lift core

INTRODUCTION

ETABS is an engineering software that is used for 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.

Here we are modeling and analyze a G+7 residential building in zone 5 using ETABS

PROCEDURE

Step 1:Open ETABS software

Open a new model

Step 2:Select Custom grid spacing

Select ‘edit grid data’

Step 3:Select story data

Select edit story data

Step 4:Select story 3-right click -select add story-keep existing story height

Step 5:Select story 1 make it master story

Make all other stories similar to story 1

Step 6:From define tab select material property

Add M30 concrete and HYSD415 and HYSD500 rebar

Step 7:From define tab select section properties

Then select Frame sections -Add new sections

Add columns and beam

Step 8:From define tab select section properties

Select slab sections

Add new property

Add slab properties

Step 9:Select quick draw columns

Select all stories

Select the column size

Step 10:Select quick draw beams

Select all stories

Select the beam size

Step 11:Draw shear walls

Step 12:Draw floors and cantilever slabs

Step 13:Select base level and assign joints as fixed

Step 14:Select define

Select load patterns

Add load patterns

Step 15:Select the beam with brick wall and assign the load

Step 16:Select Design

Live load reduction factor

Step 17:Define-Select mass source

Click on modify/Show mass source

Step18:Define-function-Response spectrum

Step 19:Define-load cases-Add new load cases

Step 21:Add load combinations

Step 20:Select ‘Run analysis’

RESULT

Display-Show tables

Structure output-model information

Select -modal participating mass ratios

Select -Display-Story response

Modal mass participation for first 3 modes donates at least 65%- Achieved only for X-axis

Mode 1 and mode 2 differ by 10% - Achieved

Principal modes be greater than torsional mode -Achieved

Inter story drift limited to 0.004 -Achieved

Axial stress in column and shear wall - Achieved