Modeling of 25 - Storey Building with the Specified Properties Using ETABS

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:

1) Open ETABS 19 application

2) Click the File menu and choose to Create a New Model option from there.

3) After choosing a New model a dialogue box will appear which is known as Model Initialization.

4) Choose the Built-in settings option and select the display units and codes.

Step 2:

1) After the model initialization needs to select Grid and Story inputs from the New model quick templates dialogue box.

2) In this dialogue box choose custom grid spacing and custom story data which is used to provide the inputs whatever we want.

Step 3:

1) In the Grid system data dialogue box, set x grid data as 5 numbers at a distance of 4m

2) And also set Y grid data as 4 numbers at a distance of 4m.

3) Click OK

Step 4:

1) In a story data dialogue box, need to input all the relevant details about the story which we want to model.

2) Click add a story and add 21 more story

3) Put 3m height for all the story except plinth

4) Make 1st story as Master story

5) Choose all other stories as similar to 1st story

6) Click OK.

Step 5:

1) On the top right corner click the drop-down arrow

2) Choose New window option

3) Now the screen splits into two.

4) Here, we can see the plan and elevation of each story simultaneously.

Step 6:

Applying Properties to Materials

1) Click Define tab

2) Choose Material properties

Step 7:

1) After selecting Material Properties from the define tab, a dialogue box will appear. In this dialogue box Select the regions as India

2) Similarly choose all other inputs like Material type, standard, grade accordingly.

Step 8:

1) After clicking ok for Add New Material Property dialogue box it redirects into another dialogue box called Material property data.

2) In this data all the relevant data values are assigned default as per IS code which we set previously.

Step 9:

1) After applying the properties of Beams and columns we need to apply the property of Slab

2) Click Define menu and choose Section properties

3) Select Slab Sections

Step 10:

1) Click to select Add New Property

Step 11:

1) Rename the Property name

2) Select the material as M30

3) Choose modeling type as Membrane from the drop-down list

Step 12:

Drawing of Columns and Beams:

1) To drawing the columns and beams in Etabs just click the Quickdraw columns tool in the model tree

2) After clicking the tool, the property tab will appear on that tab all the relevant detail about the particular objects will show.

Step 13:

1) Draw the Columns in accordance with the grids

2) Click the Select object tool to discard the drawing.

Step 14:

Applying Loads:

1) Click Define tab

2) Choose Load Patterns.

Step 15:

1) Add new load as Brickwall, EQX with both positive and negative eccentricity as per IS 1893:2016

2) Similarly add EQY with positive and negative eccentricity

Step 16:

1) After providing the names and codes of load

2) Click Modify Lateral load option

3) Set story rage as a base to top (25th Storey)

4) Assume the zone as Zone IV

Step 17:

1) After providing the load inputs need to assign the shell loads of each story

2) Change tab as Similar story

3) Select the entire grids

4) Click the Assign tab and choose Shell loads

5) Select Uniform

Step 18:

1) Choose the load pattern name as already set in the previous step.

2) Input the load as 3kn/sq.m as given in the question

3) Click ok

Step 19:

1) Similarly we need to assign the live loads for all the beams

2) click the Select tab

3) choose object type and select Beam

Step 20:

1) Choose the load pattern name from the drop-down list

2) Set load as 10Kn/sq.m

3) Click Ok

Step 21:

1) To view the loads click the toggle option on top of the screen

2) And rotate the view where we can see the loads applied.

Step 22:

1) Before running the analysis we have to set one more step i.e. Mass Source

2) Go to the Define tab

3) Select the Mass Source option.

Step 23:

1) Tick mark the specified load patterns

2) Add the load patterns which we want to assign the model

3) Click Ok

Step 24:

1) one of the important steps for modeling is to set load combination

2) Click the Define tab

3) Select Load Combinations

Step 25:

1) Choose the load combination

2) Select Concrete frame design

3) Click Ok

Step 26:

1) Immediately ETABS will give you various load combinations as per the code which we are set previously

2) Click Ok

Step 27:

1) Final step of analysis is to set Diaphragm

2) Click the Assign tab

3) Choose shell and select Diaphragm.

4) Choose an all story option from the bottom of the screen

Step 28:

1) Click the check tab

2) And check the model is there any mistakes. if not go ahead the analysis.

:

Result:

1) After the analysis option-click result tab

2) we can see the result by selecting loads separately.