Challenge

Project 1_Comparative study of different storey buildings for Seismic forces

DDiptesh Pawar22 Jul 2023

MODELLING OF 25 STORY BUILDING WITH THE SPECIFIED PROPERTIES USING ETABS

AIM :
Model a 25 storey building on ETABS with structural properties as specified below. Ground floor or plinth floor level can be taken at a height of 1.5 metres from the base. Each of the successive 25 storeys has a storey height of 3 metres.
SOFTWARE USED :
ETABS : EXTENDED THREE DIMENSIONAL ANALYSIS OF BUILDING SYSTEM this software is used for design and analysis of buidings system .
It mainly used for structures like high rise buildings steel and concrete structures
IS CODE USED IN THE PROJECT :
IS 800 :2007 FOR STEEL DESIGN
IS 456 :2000 FOR CONCRETE DESIGN
GIVEN INFORMATION :
Structural Element Sizes :
- Beams : 300 × 400 mm
- Columns : 800 × 800 mm
- Slab : 150 mm thick
Material Properties :
- Grade of Concrete : M30
- Grade of Steel Reinforcement Bars : Fe 415
Loading :
- Dead Load on beams from infill wall : 10 kN/m (Let us assume the same for roof floor in view of parapet)
- Live load on floor : 3 kN/m2 (Let us assume the same for roof floor)
a) Buildings are assumed to be pinned at the base

b) All columns in all storey are of the same size

c) All beams in all storeys are of the same size

d) Building is located on Soil type-II and in Zone-III. Assume other factors if required.
CHECK THE FOLLOWING THINGS :
Check if the translational fundamental natural period of vibration in both the x and y direction is approximately: Tx1= 4.4 second Ty1">Ty1= 4.2 second
Check if the following provision in Table 5 of IS 1893 (part 1) – 2016, on torsional irregularity satisfied:
Check if the two provisions of clause 7 in Table 6 (shown below) of IS 1893 (part 1) – 2016, regarding vertical irregularity is satisfied
Check if provision on inter-storey drift limitations in clause 7.11.1.1 satisfied. Please note that this check is for Serviceability Limit State and hence is for situation when stucture is subjected to unfactored seismic base shear

PROCEDURE :
click on ETABS SOFTWARE then ul of software is open shown below
STEP 1
Click on NEW MODEL then model initialization tab is open
provide the display units , steel and concrete IS CODE as shown below
click OK
STEP 2
After that NEW MODEL QUICK TEMPLET tab is open
in that click on CUSTOM GRID SPACING and click on EDIT GRID DATABASE
In this box we set the 5 no of grids in x direction and 5 no of grids in y direction having distance is 4m.
as shown below
click ok
STEP 3
in that click on CUSTOM GRID SPACING and click on EDIT GRID DATABASE
In this box we set the 5 no of grids in x direction and 5 no of grids in y direction having distance is 4m.
as shown below
click ok
STEP 4
Click on custom story data
Give the first level as plinth level and another level is story 1 , then story 2 till story 25
give the hight of plinth is 1.5 m
we dont provide slab on plinth as per shown below
click ok
STEP 5
After that plan and eleveation of each story are shown
shown below
STEP 6
Applying the material properties to the frame
so that click on define tab
then dialogbox is open
from that click on material properties
then click on ADD MATERIAL
click on add new material
first add concrete material
click OK
again click OK
after that ADD steel material
click ok
click ok
now both steel and concrete material is added
click ok
STEP 7
Then go for section properties
click on frame section
and create a new beam section shown below
click on frame section
then new dialogbox is open shown below
select the concrete rectangle
click on rectangular section
click ok
Then new dialogbox is open
give the name as b300x400
material as M30
depth of beam is 400 and width is 300
shown below
from properties modifires
for MI of the beam we consider only 30 % for earthquake design but that applicable only for ultimate design .
but here we do only analysis so that we cant change any values .
click OK
click on modify show rebar
new dialogbox is open
from that change design type
and also change rebar material as HYSD415 shown below
click ok
now do same process for column frame shown below
click OK
STEP 8
Then define slab
so that click on define then section properties then slab section
then new dialog box is open
from that click on add new properties
give the name of slab is slab150
slab material is M30
here we put modeling type as membrane becouse to avoid T section and L section
then give the slab thickness is 150 ........ ( which is given in question )
click OK
Click OK
STEP 9
Give the load patterns
so that click on define tab
then click on load pattern
Then new dialogbox is open
where dead load and live load alrady there
then add wall load also add EQX and EQY load shown below
then click on EQX
then modify lateral load
dialogbox is open there as shown below
click OK
again Click ON EQY
again click on modify lateral load
then click ok
STEP 10
Then go to difine tab
click on mass source
then one new dialogbox is open
shown below
then click on modify shown mass source
again new dialogbox is open
from that select the specified load pattern
then give the load pattern as shown below
click ok
STEP 11
check the load cases
for that go to the define tab
click on load cases
new diaogbox is open as per shown below
then click ok
STEP 12
Give the load combination
agin go to the define tab
click on load combination
then load combination dialogbox is open
from that click on add design load combination
agian new dialogbox is open as per shown below
click ok
again click ok
STEP 13
draw the column
so that do to the quick draw
one properties dialogbox is open
select the column as shown below
then mark the column shown below
STEP 14
Draw the beam
so that go to the quick draw column / beam option
select the B300X400
and draw it shown below
STEP 15
Draw the slab
so that click on set plan view
one dialogbox is open
select the first story which is master story
click on apply and then ok
then go to the quick draw floor option
selct the slab150
and then draw the slab
STEP 16
select all beams and asign frame loads
so that click on select tab
then click on properties
and frame section
one new dialogbox is open
in that select the beam as B300x600
as shown below
click on select
then asign frame loads click on asign tab
then click on frame loads
then distributed frame load
then one dialogbox is open
from that select the wall load
and give the value of load is 10
click on apply
and then ok
STEP 17
now select the slab
so that again go to the select tab
click on select , then properties , then slab selection as shown below
then new dialogbox is open
from that click on slab150
select it and then close it
STEP 18
apply uniform shell loads
so that
click on asign tab
from that click on shell loads then uniform
one dialogbox is open
from that select the load pattern as live load
and give the value of live load as 3 kN/m^2
Click on apply and then ok
STEP 19
Select the all slab again
after selection
select diaphragms
for that
click on asign tab , then click on shell , then diaphragms
then new dialogbox is open
click on D1
then apply and ok
center of mass is automatic calculated by using diaphragms properties
STEP 20
Check the model
so that go to the analyze tab
click on check model and check it

Project 1_Comparative study of different storey buildings for Seismic forces

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in your own course.

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Ship work like thisin your own course.

Talk to a career counsellor

Ship work like this
in your own course.