Structural Modelling using Etabs 2018

Aim: To run a modal response spectrum analysis and check analysis results of the Etabs model for the inter-story drift requirements, vertical and planar irregularities, minimum shear wall requirements, maximum axial load ratio for column and shear walls , an effective moment of inertia for beams

Procedure:

• Open new Etabs file
• set the modal initialization as shown below

• Next select edit grid

• Now set the grids as shown

• Now select the edit story data

• Now set the storys as required

• now we get the grids as shown

• Now define the material properties as shown below

• Now define the section properties as shown below

• Now define the slab sections as shown

• Now define the wall sections

• now by using quick beam ,quick column and floor options draw the building as shown below

• Define load patterns
• Define mass source

• Define pier

• Assigning live load

• Assign wall loads

• Define response spectrum

• Now define load combinations for concrete

• Now check the model as shown

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• Now run analysis

• Now check the base reactions table

• Now check the modal participation ratio

• We have done with modeling
• When we divide the base shear taken up by the shear wall divided by the total base shear of the building will get the percentage of shear forces taken up by the shear wall.If that is less than 80% then the more shear walls we need to add to the structure.

Result:

The building has been modeled and analyzed successfully.