Structural Modelling using Etabs 2018

Aim: to model and analyze the G+7 stoey building using Etabs with application of proper load cases and load combinations for the given typical floor plan drawing.

Procedure:

• Open the ETABS software.
• Set the grid and storey details using editing options.Provide 4 grids at X direction and grid at Y direction with proper spacing.

• Now define each storey and story height.

• Click define tab and select the materials.Choose the material type asconcrete for M25.

• Similarly for rebar material.click define slect add new material option and choose the type as Rebar.

• Click define tab and select frame section property.
• Provide the beam dimension as 350X550.Then modify the rebar details.

• Select define tab and select frame section property.
• Provide the column dimensions as 400X600.Then modify the rebar details.

• Click define,select section propertes and click on slab sections.
• Provide the thickness of the frame as 150mm.

• By using the quick draw column/beam option place the columns in the floor plan at each grid intersection.
• Select all storey option.

• Similarly draw the beam per the floor plan.

• Draw the shear walls in required places.

            

• Click on the plan and select base and select one story.
• Select all the column base.
• Click on assign,select joint and select the joint as fixed.

    

• By using the quick draw flor/draw rectangular floor plan option place the floors.
• Select all storey option.
• Click on load patterns and define dead,brick wall and live load.

• Apply the brick wall load in all the beam component.

• Apply live load as per IS 875.
• Live load= 2KN/sq.m(As per table 1 from IS 875 part 2)
• Live load= 3KN/sq.m for balconies,lift area and walkway(as per table 1 from IS 875 Part 2)

                  

            

• All the roof we take 50% of live load.

             

• Similarly the reduction factor has benn taken from clause 3.2.1 in IS 875 part 2.

• Click on the load patterns and define the seismic loads.

       

• Calculate the time period T value from IS 13920 clause no 7.6.2

       

• Define the mass source.

          

• Go to define and click on the pier labels.

• Select the shear walls one by one and assign the pier labels.

• Click on the load cases and define the number of modes.

• Click on define,select function and select on response spectrum.

• Define the response spectrum in both X and Y direction.

• Select load combinations and click on the default design combinations.

• Select analyze and click on check the model.After the model checking click on run the analysis.

• Select display and click on show table.

• Unlock the model.By using the base reactions adjust the scale factor in response spectrum.

• After that run the analysis and see the inter-storey drifts.The drifts should be within 4 %

       

Base shear is greater than 80%

Conclusion: the analysis has been done successfully.