Modelling of 25 storey building with the specified properties using ETABS

1. Aim:

To Modelling a 25 story building on ETABS 2018 with structural properties including Ground floor or plinth floor level at a height of 1.5 meters from the base and a story height of 3 meters.

Procedure:

Step 1:

• Open ETABS 19 application
• Click the File menu and choose to Create a New Model option from there.

        

• After choosing a New model a dialogue box will appear which is known as Model Initialization.
• Choose the Built-in settings option and select the display units and codes.

Step 2:

• After the model initialization needs to select Grid and Story inputs from the New model quick templates dialogue box.
• In this dialogue box choose custom grid spacing and custom story data which is used to provide the inputs whatever we want.

        

Step 3:

• In the Grid system data dialogue box, set x grid data as 5 numbers at a distance of 4m
• And also set Y grid data as 4 numbers at a distance of 4m.
• Click OK

       

Step 4:

• In a story data dialogue box, need to input all the relevant details about the story which we want to model.
• Click add a story and add 22 more story

       

• Put 3m height for all the story except plinth
• Make 1st story as Master story
• Choose all other stories as similar to 1st story
• Click OK

       

Step 5:

• On the top right corner click the drop-down arrow
• Choose New window option
• Now the screen splits into two.
• Here, we can see the plan and elevation of each story simultaneously.

       

Step 6:

Applying Properties to Materials

• Click Define tab
• Choose Material properties

        

Step 7:

• After selecting Material Properties from the define tab, a dialogue box will appear. In this dialogue box Select the regions as India
• Similarly choose all other inputs like Material type, standard, grade accordingly.

      

Step 8:

• After clicking ok for Add New Material Property dialogue box it redirects into another dialogue box called Material property data.
• In this data all the relevant data values are assigned default as per IS code which we set previously.

        

Step 9:

• After applying the properties of Beams and columns we need to apply the property of Slab
• Click Define menu and choose Section properties
• Select Slab Sections

       

Step 10:

• Click to select Add New Property

      

Step 11:

• Rename the Property name
• Select the material as M30
• Choose modeling type as Membrane from the drop-down list

      

Step 12:

Drawing of Columns and Beams:

• To drawing the columns and beams in Etabs just click the Quickdraw columns tool in the model tree
• After clicking the tool, the property tab will appear on that tab all the relevant detail about the particular objects will show.

       

Step 13:

• Draw the Columns in accordance with the grids
• Click the Select object tool to discard the drawing.

        

Step 14:

Applying Loads:

• Click Define tab
• Choose Load Patterns.

          

Step 15:

• Add new load as Brickwall, EQX with both positive and negative eccentricity as per IS 1893:2016
• Similarly add EQY with positive and negative eccentricity

       

Step 16:

• After providing the names and codes of load
• Click Modify Lateral load option
• Set story rage as a base to top (25th Storey)
• Assume the zone as Zone IV

       

Step 17:

• After providing the load inputs need to assign the shell loads of each story
• Change tab as Similar story
• Select the entire grids
• Click the Assign tab and choose Shell loads
• Select Uniform

       

Step 18:

• Choose the load pattern name as already set in the previous step.
• Input the load as 3kn/sq.m as given in the question
• Click ok

       

       

Step 19:

• Similarly we need to assign the live loads for all the beams
• click the Select tab
• choose object type and select Beam

       

       

Step 20:

• Choose the load pattern name from the drop-down list
• Set load as 10Kn/sq.m
• Click Ok

        

        

Step 21:

• To view the loads click the toggle option on top of the screen
• And rotate the view where we can see the loads applied.

Step 22:

• Before running the analysis we have to set one more step i.e. Mass Source
• Go to the Define tab
• Select the Mass Source option.

        

Step 23:

• Tick mark the specified load patterns
• Add the load patterns which we want to assign the model
• Click Ok

      

Step 24:

• one of the important steps for modeling is to set load combination
• Click the Define tab
• Select Load Combinations

       

Step 25:

• Choose the load combination
• Select Concrete frame design
• Click Ok

        

Step 26:

• Immediately ETABS will give you various load combinations as per the code which we are set previously
• Click Ok

        

Step 27:

• Final step of analysis is to set Diaphragm
• Click the Assign tab
• Choose shell and select Diaphragm.

      

•  Choose an all story option from the bottom of the screen

          

Step 28:

• Click the check tab
• And check the model is there any mistakes. if not go ahead the analysis.

         

Step 29:

• Now Go to analyze menu->run analysis->analysis will take some minutes

        

• Go to "Show deformed shape or F6"->Tab will open and select any case(live/dead,earthquake) you want view the deformed shape

    

Step 30:

• click on Display menu->Show tables->TAbles display will open
• select anaylysis results->structure output->modal information->Modal participation mass ratios

       

• A Modal participation mass ratios table will appear with all the mass ratios action on the builidng