Structural Modelling using Etabs 2018

 

To model and analysis G+7 storey building 

using ETABS with application of proper 

load cases and load combination 

for given typical floor plan 

drawing .

 

 

 

 

STEP-1:

Open ETABS  software .

setgrids and storey details using editing option .

provide 4 grid in  X direction and 6 grid in 

y direction with proper spacing .

 

 

 

 

STEP2":

Now define each storey and storey height .

 

STEP3;

click define tab and select material .

chosse material  such as  m25 concerete .

SREP4;

 

Similar rebar material , click define select add new material

option and choose type as rebar grade as HYSD GRADE 500

 

 

STEP5;

Click define tab .select frame section property .

provide beam dimesion as 350 x 550 . then modify rebar details .

 

 

STEP6;

Click define  tab .

select frame section property .

provide column dimesion as 400x600 , then modify rebar details 

 

 

step7;

click define . select section property , click on slab section.

provide thickness of frame as 150mm 

 

STEP 8;

CLICK define . section section property . click on wall section.

set thickness of wall as 250mm.

 

 

 

STEP 9;

BY using quick draw column / beam option place the column in floor plan  at each grid intersection 

select all storey option .

 

 

STEP 10 ;

Similarly draw beam as per floor plan .

 

 

 

draw shear walls ,as required places 

 

STEP 11';

Click  on plan and select base .

select one storey .

select all column base .

click on assign . select joint . select joints as fixed .

 

STEP 12 

BY using quick draw floor / draw reactangur floor plan option place floors .

select all storey  option .

 

 

 

step 13 

 

click on load patterns and define dead , brick wall and live load .

 

 

step 14 ;

apply brick wall load in all beam components .

 

 

step 15 ;

apply live load as per  is 875 

L.LOAD = 2 KN/M^2 [AS PER TABLE 1 IS 875 PART 2]

LIVE LOAD =3KN /M^2 [AS PER TABLE 1 FROM IS 875 PART 2] FOR BALCONIES , WALKWAY ,AND LIFT AREA.

 

 

 

AT roof we take only 50% of live load .

 

 

 

step 16

similary reduction factor has been taken from clause 3.2.1 in is 875 part 2 .

 

 

step 16;

click on load pattern and define the sesmic loads.

 

calculate time period T value from IS 139220 CLAUSE NO 7.6.2

 

 

STEP 17

Define mass source .

 

 

step18;

select on all story option .

goto select objective type  floor .

select all floors.

-go assign , click on shell , click on diaframe .

assign diaframes to all floors .

 

step 19

 

goto define ,

click on pier  labels and  pier labels .

 

 

 

select shear walls one by one and assign pier labels .

 

 

step 20

click on load cases and define no. of modes .

 

 

step 21 ;

click on analysis , click on load  cases to run .tick mark calculate diaphrams center of rigidity .

 

 

 

step 22 ;

click on define ,select function and select on responese spectrum .

.define response spectrum in  x and  y  direction .

 

step23

.select load combination , click on default design combinations .

 

 

step 24 ;

select analysis and click on check model .

after  model checking click on run analysis .

 

 

select display and click on show table .

unlock model . by using base raction adjust the scale factor in response spectrum .

 

after run and analysis and see inter storey

drift the details should shouls be with in 4 %.

 

base shear is > 80%

 

than next analysis is completed .