Structural Modelling using Etabs 2018

Aim: To model and analyze the G+7 storey building using ETABS with the proper load cases and load combinations for the given typical floor plan drawing.

Procedure:

Step1:

• Open the ETABS software.
• Provide 4 grids at X-direction and 6 grids at y-direction with given proper spacing.
• Click on edit story data and give the no fo storey and height of the building.
• Click Ok.

Step2:

• Go to define tab and click on the material property.
• Click on add new material and choose the type of rebar and concrete.
• And click ok.

Step3:

• In order to define the beam property, select the define tab.
• select the frame section property.
• Provide the beam section
• and modify the beam rebar details.
• Click ok.

Step4:

• select the frame section property.
• Provide the column section
• and modify the column rebar details.
• Click ok.

Step5:

• Go to define tab, and select shell frame
• provide the thickness of slab is 125mm
• Click ok.

Step6:

• Now we need to provide the shear wall property.
• Give the thickness of 250mm.
• Click ok.

Step7:

• By using the quick draw of column/beam option place the components in the floor plan.
• Make sure that while the beam and column we need to select the storey section as All storey.\
• assign the columns where it reqired.

Step8:

• Assign the beams

• Here assign the interior beams
• And add the cantilever beams near the balcony, by using the command Move and replicate.

Step9:

• Assign the shear walls where you required.
• Total shear walls should be symmetric.

Step10:

• Assign the slabs

Step11:

• Go to the define tab and click on load patterns.
• And click on add new loads
• Click Ok.

Step12:

• Assign the load on beams and floors by gravity direction.

Step13:

• Select all floors.
• Go to the assign tab and select shell loads
• And select diaphragms.
• Click ok.

Step14:

• Go to the define tab and click on the mass source
• And add the loads
• click ok

Step15:

• Assign the pier label to the each shear wall.

Step16:

• Define the response Spectrum

Step17:

• go the load case and add the response spectrum case in X and Y direction.

Step18:

• Base reaction

• Eqx obtained is 1220.99KN and RSx=1020.85KN.Hence the scale factor = 1220.99/1020.85=1.196
• Similarly, Eqy=1635.76KN and RSy=958.502Kn. Here the scale factor = 1685.76/958.502=1.758.
• So, now keep these values as scale factor.

Step19:

• Check mass ratio.

Step20:

• Now we need to see both RSx and RSy the max drifts should not exceed 0.004 as in IS:893-2016

Result:

The structural model of G+7 building is developed as per IS1896-2016 and IS13920-2016.