Structural Modelling using Etabs 2018

Aim:

The architectural drawings for a G+7 residential building in zone 5 have 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 Etab.

Given :

• 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 on the ground floor – the column/shear wall arrangement must not
  obstruct entry/exit of vehicles.
  The following loadings are to be taken into account:
• Brickwall made of AAC blocks
• Finishes – floor tiles of 75 mm thickness
• Live loads as per are 875 part 2
• The water tank of 20 KL above the staircase at Mumty level
• Lift Machine room at mumty level above lift core

Procedure :

Step 1:

** To model the grids

Step 2

** To model story height

Step 3:

*materials need to be added to the model

*M30 Material for concrete

*Define > Material properties > Add new Material

** Steel for rebar HYSD 500

Step 4 :

*To Define Column properties

* Frame section property > column size 400 x 400

Step 5:

*To define beam properties

Frame section property > beam size 300 x 500

Step 6:

*To add the slab properties

*Section properties > slab

Step 7 :

To add wall properties

Section properties > wall properties

Step 8:

*To model the columns

* Quick draw column option is selected to draw the columns

Step 9:

*To Model beams

To assign joints

Base plan > assign > joints

*Now to a model of secondary beams or to model beams according to the plan

*Draw and Ctrl + r option is used to model the beams

*Next step is to add the shear walls

*The slabs are now added to the model

*To change the rotation > frame >Local Axes

Step 10 :

*now we need to create the loads

*Define > Load patterns

*now we will have to modify the lateral load

*User define > T = 0.65 sec

*Now we will have to assign the loads

*design > load reduction factor

*Live load is applied to the model

*Modify mass source

Add the diaphram

Assign > shell > diaghram

*After this we need to run the analysis

*using the display option we need to show the Model participation ratio

Base reaction :

Modal Participating ratio

Storey stiffness

*Now we need to check the storey response plot i.e check the drift

Result :

*Successfully the etabs model has been create