Structural Modelling using Etabs 2018

AIM: 

To model and analyze the G+7 residential building in zone 5 from the given architectural drawings using the ETABS 

PROCEDURE: 

• Open Etabs software and go to File then New model then click on that. 
• After that Grid system data dailog box will open Provide the grids as shown in attached picture 
• Enter the story details as per mentioned in the question.Make story 1 as master story and other stories similiar to story 1 
• Now you can see the model has been created as a grid system as per data entered 
• Then go to Define again then Section properties then Frame sections to add the frames for the model.

• Create a new frame and name it as per data required. For beams select the M3 Design option and define the rebar material as Longi.bars as HYSD500 and Confinement bars as HYSD415 
• Similarly do the same steps for columns also.
• And then click on the Modify/Show modifiers.

For slab

• Go to define then section properties then slab sections 

For wall sections

• Go to Define then Section properties then wall sections. 

Assign the columns 

• Click on the Quick draw column option and draw the columns as required 
• Select from the properties option and assign the columns 
• We need to add beam using the quick draw option 
• Next we need to add secondary beams using the quick draw beams option 
• Add the shear walls in required locations in the residential building 
• Then go to the base plan, Select all the base points. after that Go to assign, then joints, then click restraints. Then choose Fixed Joint and click apply  add dead load, live load, brick wall load, and earthquake load. 
• Select load pattern as Brickwall and take the uniform load as 3.5 kN/m 
• Use the select option to choose all the floors. From the Shell option select the diaphragms 

RESULT: 

Modal Mass Participation for first 3 modes must be 65% 

Mode 1 and 2 differs by 10%

Now open the reactions tab, then select the eartquake load towards X-direction(EQX) in the load case 

The base shear reactions,When we divide the base shear which is taken by shear wall divided by the total base shear of building , it will get us the % of shear force taken up by the shear wall.

If it is less than 80%, then more shear walls are need to be added.

Here in our building it is sufficient.