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Challenge

Project 1_Comparative study of different storey buildings for Seismic forces

GG Leela Gowthami2 Nov 2022

Aim: To create the influencing of Dynamic charecteristics, Natural period and Mode shapes of a building.

Introduction: To create the influencing of Dynamic charecteristics, Natural period and Mode shapes of a building.

Procedure:

Model-A

Open the Etabs software and click on the New Model.

Create the settings as per the units and codes in the drawing.

Select create grid spacing and create story data to create grids and stories as per the building floors.

There are 5 stories in the grdi data and add one grid at a distance of 4m for each grid.

Now after creating grids click ok.

For story in the first model there are only 2 stories.
So we need to delete one story and mark the ssimilar to option for story 1.
Then click ok.

Now we can see the plan and 3d model view.

Go to define tab and select material properties.

Click on add new model option.

Create M30 material for concrete.

In the same way create material for steel also.

Now we can see the materials which we added.

Now go to define tab and click on the frame section for creating beams.

Click on add new property.
Create beam size as in the given question.

Select beam option and give the bar options.

Now we can see the beam size which we added.

Select concrete beam structure option.

Create column size as in the given question.

After creating column click on ok.

Now select section properties and select slab section.

Now mention slab dimensions and click ok.

Now we can see the slab material and click ok.

Now we have to apply loads and select load frames.

Click on add new load option and add loads for lateral loads and displacements.
Then click ok.

Go to define tab and select load cases.

Now click on mmodal case and click ok.

Then go too define option and select load combinations.

Select add default change option.
Then click ok.

Selct concrete frame design option.

Click ok.

Now we can see the plan and 3d plan with loads.
Select quick column option.

Place the columns on the grids.

Now we can see all the columns placed on the grids.

Here we can see all the columns are placed on the grids.

Now select for quick draw frames for beams placing.
Place all the beams on the grids.

Now select slabs and place all the slabs.

Now we have to select all the slabs.
Go to select option and click on frames option.

Now select beams with size which we have created.

We have to apply loads to the beams.
Go to assign option and select distributed loads.

Give the live load as 10kn/m as in the given question.

Now we can see the loads applied to beams.

Again go to select option and select slab sections.

Select slab length option.

Then assign the loads for slabs as uniform distributed loads.

assign the load as 3kn/m as per the question.

Now we can see the load applied to the slab.

Go to the define option and select main source option.

Now click on the add mass source option.

Add the loads as dead, live and wall loads.

We can see the new mass source select the mass source and click ok.

Select all the slabs from select option.

Go to assign option and selct shell and diaphragam option.

Select d1 and click on ok.

Now we can see the diaphragam applied on the slabs.

click on run analysis option.

Finallly we can see the diaphragam in the 3d view.

MODEL-B

Click on the file option and save as the file to another name for model B.

To add the stories click on the edit stories option.

Select modify story data option.

Add the stories upto story 5.

Now click on refresh view and click on ok.

Check the loads whether they are aplied to the added stories.

Load is applied to all the stories.

Now in the same way check the wall loads.

Now we can see wall loads are also applied to all the stories.

Apply digphragam to the slabs.

Do the run analysis option.

MODEL-C

Do save as the file as model-C

Go to the define tab and select frame section option.

Seelct the column option.

Give the column size as per the given question.

Now we can see the column size hich we have created.

Now we can see the column sizes are changed to new column sizes.

Now select all the frame sections for beams.

Select the column size.

Now assign the load axes to the columns.

Then give the angle as 90 for changing the column direction.

Here we can see the column positions are changed.

Now select the slab positiion.

Apply the diagrapham to the stories.

Now we can see all the slabs with load applied to it.

Click on run analysis option.

Finally drawing is ready with all loads applied on it.

MODEL-D

Do the file save as to Model-D

Click on the select tab and select all the frame sections.

Now select the column with the given size and click ok.

Now go to assign tab and apply load axes to the columns.

Give the angle as 0 to change column position.

Now we can see the column orientation.

Now go to the select tab and select all the slabs.

Select the slab length and click ok.

Assign diaphragam to the slabs.

Select Di option and click ok.

Now we can see all the loads applied to the slabs.

Click on run analysis option.

Now we can see the resuts after the run analysis.

MODEL-E

Do save as the file as Model-E

Now add the stories as per the stories given in the question.

Click on Modify option.

Right click on the story and select add story option.

Give the number to add the stories.

Now we can see stories added to the grids.

Now we can see the storeys added.

Check the loads applied on the storeys.

We can see the loads applied on the storeys.

Check the live load applied on the grids.

Now check the wall load applied on the grids.

Go to the define tab and select frame section option.

Now select the column option and click ok.

Change the column size as per the question.

Select the column and click ok.

Click on the concrete option.

Change the column size.

Click on the add story option.

Now unselect the beams and floors and click ok.

Now we can see the unhide of beams and columns.

Now set the building limits by selecting building limits option.

Select the story height options.

Now we can see the selected columns.

Select all the columns.

Now go to assign option and select section property option.

Select the column position.

Now we can see the columns assigned to the grids.

Again change the building story limits.

Now we can see all the columns with the given column sizes.

also we can see in the plan of column assigning.

Now unselect the beams and floor to view in the drawing.

We can see the beam sizes assigned to the grids.

Now go to the select option and select slab position.

Now go to the assign option an apply diphragram.

Here we can see the diphragram applied on the drawing.

Click on the run analysis.

Final we can see the result applied on the grids.

MODEL-F

Do the file save as as model-f.

Now set the boundary limit option and click ok.

Now hide the beams and floor option.

Now select all the columns on the 3d view.

Now assign section property.

Select the column option and click ok.

Now do unhide option for beams and floors.

Here we can see the column size applied on the grids.

Go to the select option and select slab portion.

Assign diphragam to the slab.

Here we can see the dipragam applied on the grids.

Click on run analysis option.

Final diagram is ready in the grids.

MODEL-G

Do save the file as save as option.

Now select the add story option and add the stories.

Give the number to add the stories.

Here stories are added to the grids.

Now check the loads applied to the grids.

here we can see the waall load applied to the beams.

Now all the loads are applied to the grids.

Go to define option and selet the frame section.

Change the column sizes as per the given question.

Now set the building view level options.

Give the number stories to the top and bottom stories.

We can see the selected columns on the grids.

Go to the assign option and select section property.

Here we can see the column sizes assigned.

Select the stories for the second list on the grids.

Now assign the section property load.

Now select column size and click ok.

Here we can see columns assigned to the grids.

Here we can see the columns size assigned to the girds.

Click on the run analysis option.

columns are assigned to the grids in the plan view.

Now assign dipragram to the slabs.

Here is the final drawing

Model-H

Do save as the file with the model-h name.

Now we can see the plan and 3d view of the drawing.

Now assign the section property for the grids.

Here we can see the 3d view of the storeys.

Now we can see the columns assigned in the plan view.

Check the loads assigned to the grids.

Now assign the slab diphragram to the slabs.

Now loads are assigned to the slabs.

MODEL-J

Do save as the file with the other name.

Now take the 3d view of the drawing.

Now assign the loads to the slab for uniform distributed load.

Give the loads for live load as 3.3kn/m.

Here we can see the loads assigned to slabs for live loads.

MODEL-K

First we have to save as the file for the previous file.

Now select the all slabs by using select tab option.

Now assign the slabs portion as uniform distributed loads.

Now loads are applied to the slabs.

Clearly we can see the loads applied for both plan and 3d view.

Final drawing is ready for all the slabs assigned.

MODEL E TABLE FOR MODEL TABLE AND FREQUENCIES.

Select the table from analysis and results.

Here we have the period sec as 1.20 from the table.

MODEL F

In the same way take the load for model f for model periods and frequencies.

MODEL-G

In the same way take the load for model g for model periods and frequencies.

MODEL-H

In the same way take the load for model H for model periods and frequencies.

MODEL J

In the same way take the load for model J for model periods and frequencies.

MODEL K

In the same way take the load for model K for model periods and frequencies.

EFFECT OF TIME PERIOD FOR BUILDING A

MODEL B

MODEL F

MODEL H

MODE FOR TIME PERIOD

MODEL B

MODEL C

MODEL D

DEFORMATION CHECK:

Now select modal 1 option.

Select the mode option.

Select apply and click ok.

In the same way select for mode 2 option.

In the same way select for mode 3 option.

FOR BUILDING B LATERAL LOAD CASES

LATERAL LOAD IN X DIRECTION

DISPLACEMENT IN Y DIRECTION

MODEL C

lateral load for X-DIRECTION:

Displacement in Y-DIRECTION

EFFECT OF FLEXURAL STIFFNESS IN MODEL B

FLEXURAL STIFFENESS FOR MODEL B TIME PERIOD

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