Modelling of 25 storey building with the specified properties using ETABS

• 1.

Open ETABs software click on new model and

Then dialog box appears click on custom grid spacing click on edit grid data set x and y ordinate

Click on custom story data and edit data story

Then dialog box appears on screen create 25 story for model and click on ok

Step 2

Go to define tab and click on material

One dialog box appears on the screen

Click on add new material and fill all necessary details and click ok

Again dialog box appears on screen fill all details click on ok

Setp 3

Go to define tab

Click on section properties and frame section

One dialog box appear on screen

Click on add new properties and Again dialog box will appear

Select rectangular section and Again dialog box will appear give property name as B 300X400 Material as M30

Click on modify/ shown bar dialog box appears on screen

Then click ok and again click on new property then dialog box appears

Then click ok two times

Step 4

Go to define tab click and section property and slab section

Dialog box appears on screen

Click on add new property Again dialog box will open

Then click ok

Step 5

Go to define tab click on load pattern

Dialog box will appear and gives required details

Click EQX and also modify lateral load

Then dialog box appears and fill all details

Click ok and do it same as EQY

Click ok

Step 6

Go to define ta click on mass source

Dialog box will open and click on modify/ show mass source

Again dialog box will open and fill all details

Click ok 2 times

Step 7

Go to define tab click on load cases

Dialog box appears

Click ok

Step 8

Go to define tab click on load combination

Dialog box will open

Click add default design combination

Step 9

Click draw column symbol in properties of objects select as C800X800mm

Click to draw column on required position

Click quick draw beams select property as B300X300mm create beams use replicate options

Step 10

Go to plan options select story 1

Click on apply and ok

Then floor get created

Step 11

Go to select properties and frame section Then dialog box appears select B300X400mm click select and Close

Step 12

Go to assign click on frame load distribution Then Dialog box will open and take all the details Click apply and ok

Go to select and select properties slab section

Dialog box appear and select s150

Click select and Close Go to assign click on shell loads as uniform

Give load pattern name and all details

Click apply and ok

Go to select and select properties and slab section

Then select s150

Click on select and Close

Go to assign tab click on shell as diaphragm

Select D1

Click apply and ok

Step 13

Click on run analysis choose appropriate folder and click on save

For result model periods of different models

Go to display tab click on show response plot box will open

Result

Criteria		Desirable solution	Excersie result
Fundamental translation natural period	X-Direction	4.4 sec	4.41
	Y-Dorection	4.2 sec	4.22
Torsional irregularity	IS 1893-2016 (Part-1) Table -5	Torsional mode time tahn X and Y direction time periods	Yes
Vertical irregularity	IS 1893-2016(Part-1) Table-6 Clause -7	First three mode together should contribute at least 65% in amss participation factor in each principle direction	Yes
		Fundamental lateral natural period in two principal plane direction are way from each other by at least 10%	No
Inter-storey drift	IS 1893-2016(Part-1) Clause-7.11.1.1	Storey drift shall not exceed 0.004 times the storey heigher for base shear with no load factors (4x10^-3)	Yes