Challenge

Project 1_Comparative study of different storey buildings for Seismic forces

Procedure:

Open ETABS software.
Click new model.
Give model initialization setting as follow
Click ok
In the new model quick template dialog box , select custom grid spacing and click Edit grid data
Give the following settings in grid system data dialog box.
Click ok.
Select custom story data under story dimension and click edit story data.
Give the story data for first- three story as follow having story 1 as master story.
Write click on the first column and select add story and click keep existing story heights.
Give number of added story as 22.
Click ok
The following page opens
Click Define--> Material properties
Click Add new material for assigning concrete
Click Add new material for assigning Rebars
Click ok, Again add new and add Concrete of M30 Grade
Click Define--> Section properties--> Frame sections.
Select Add new property in the dialog box.
Select the concrete shape as rectangular and give the following settings for the Beam
Beam property is added.
Again, click Add new property for creating property for column.
Column property is added.
Click--> Section properties--> Slab section
Select Add new property and give the following settings.
Clickà Define--> Load pattern
Define load patterns by its name
Click Define--> Mass source
Check load cases by click Define-->Load cases.
Create load combinations, Define--> Load combinations
Create Columns by Quick draw column.
Select quick draw beams.

Select the first horizontal and vertical beams and go to edit and select replicate Select first floor in plan view
Draw slab using quick slab by having similar stories in the status
Select all the beams from select tab
Assign frame loads as distributed from assign tab.
Select the slabs
Assign shell loads as uniform
Select the slabs from select tab and assign as diaphragm from assign tab.
Click run analysis in the panel after saving the file.

Result-

Results-
Criteria	Model	Result	Conclusion
Effect of Stiffness on time period	Building E ( 10 story with varying column size)	1.73 Sec	Here, if the stories are less then change in Column size does not effect on result.
	Building F (10 Story with Uniform column size )	1.73 Sec
Effect of Stiffness on time period	Building G ( 25 story with varying column size)	4.17 Sec	Here, we can conclude if the stories are high and change in Column size does effect on result.
	Building H (25 Story with Uniform column size )	4.41 Sec
Effect of Mass on time period	Building H (25 Story with 3 kN/SqM Imposed Load)	4.41 Sec	We provided uniform load but not so significant. Mass is directly proportional to the Displacement.
	Building J (25 Story with 3.3 kN/SqM Imposed Load)	4.42 Sec
	Building K (25 Story with 3.6 kN/SqM Imposed Load)	4.43 Sec
Effect of Building Height on time period	Building A	0.5 Sec	We know Height of building is directly proportional to the time period, so as height increases defiantly Time will increases.
	Building B	1.03 Sec
	Building F	1.73 Sec
	Building H	4.41 Sec
Effect of Column Orientation on time period	Building B	1.02 Sec	Column Orientation are create effect on flexible behavior of the Building.
	Building C	1.145 Sec
	Building D	1.12 Sec

Criteria	Model	Case	Analysis Result	Conclusion
Effect of Flexural Stiffness of structural elements on mode Shapes.	Building B	Flexural Stiffness of beams close to nil.	2.62 Sec	If we don’t consider stiffness property of beam it increases time period (almost double).
		Full Flexural Stiffness of beams.	1.02 Sec
Effect of Axial Stiffness of Vertical Members on mode shapes	Building H	Axial Cross Section for columns is close to nil.	5.99 Sec	Axial Cross section of the columns plays vital load in time period.
		Full axial cross section	4.41 Sec
Effect of Degree of fixity at column base on mode shape.	Building B	Column Support Pinned	1.02 Sec	More the fixity of the column lesser the time period.
		Column Support Fixed	0.941 Sec

Ship work like this
in your own course.