Modelling 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 application
2) Click the File menu and choose to Create a New Model option given there.
3) After choosing a New model a dialogue box will appear of Model Initialization.
4) Choose the Built-in settings option and select the display units and codes then select the unit as metric.
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 however required.
Step 3-
In the Grid system data dialogue box, set x grid data as 5 numbers at a distance of 4m and Y as 4 numbers at a distance of 4m.
Step 4-
1) In the story data dialogue box all the required details need to be provided as per our model requirement.
2) Click on add a story and add 21 story from there.
3) Put 3m height for all the story except the plinth.
4) For first story make it a master story and make all other story similar to first story.
Step 5-
1) We can see the plan view and elevation view.
Step 6-
1) For Applying Properties to Materials, click on Define tab and choose Material properties.
Step 7-
1) After defining Material Properties, a dialogue box will appear. In this dialogue box select the regions as India.
2) Similarly select all other options as required.
Step 8-
1) After step 7 it will redirect to another dialogue box named Material property data.
2) In this put all the relevent data values are assigned default as per IS code which we set previously.
Step 9-
1) For applying the properties of Slab
2) Click Define menu and choose Section properties in there select slab sections.
3) select Add New Property
4) Select the slab material and all other options given below.
Step 10-
1) For Drawing the columns and beams in Etabs click the Quickdraw columns tool in the model tree.
2) The property tab will appear where all the relevant detail about the particular objects will show.
3) Draw the Columns in accordance with the grids
Step 11-
1) For Applying Loads, Click on define tab and select load patterns.
2) For adding load for Brickwall, EQX with both positive and negative eccentricity as per IS 1893:2016
3) Repeat the same for EQY.
4) After providing the names and the codes of the load click on Modify Lateral load option and set the story rage as base to top (25th Storey)
5) Assume the zone as Zone IV
6) After providing the loads we need to assign the shell loads for each story.
7) For that change the tab as Similar story and select the entire grid.
8) Click the Assign tab and choose Shell loads and select uniform.
Step 12-
1) Choose the load pattern as already set in the previous step.
2) Input the load as 3kn/sq.m as given and click ok.
Step 13-
1) Similarly assign the live load for all the beams.
2) Click the Select tab and choose object type and select Beam.
Step 14-
1) Choose the load pattern as brickwall from the drop-down list and set load as 10Kn/sq.m and click ok.
Step 15-
1) To view the loads there is toggle option on top of the screen where view can be rotated.
Step 16-
1) To set Mass Source, go to the Define tab and select the mass source option.
2) Click the checkbox of specified load patterns and add the load patterns which is needed to assign the model and click ok.
Step 17-
1) Now for setting the Load combination, click the Define tab and select Load Combinations.
2) Choose the load combination and select Concrete frame design and click ok.
3) ETABS will give you various load combinations as per the code which was set previously,select and click ok.
Step 18-
1) The final step of analysis is to set Diaphragm.
2) For that click on the Assign tab and choose shell and select Diaphragm.
3) Choose the story option.
Step 19-
1) Click the check tab and check the model if there are any mistakes.
Result:
1) After successfully completing the analysis ckeck the results.