Stepbystep Procedure for Modelinganddesign in Etabs

7/26/2019 Stepbystep Procedure for Modelinganddesign in Etabs

1/68


2/68


3/68


4/68

Building Plan Grid system and storey Data Definitions will be displayed after selecting Nobutton.

Set the grid line and spacing between two grid lines. Set the storey height data usingEdit storey Data command.


5/68

Note: You can change Grid spacing by choosing Custom Grid spacing, for columnvarying spacing then click Edit Grid you can also change any storey height by choosingCustom Storey Data, then click on Edit Storey Data.

Go to Main menu Edit Storey data Edit Storey.


6/68


7/68


8/68


9/68


10/68

STEP 3: (Define Material Properties)

From Main menu Define Material Property Add new material Material Name =M30Concrete cubic comp. strength fck =30Bending Reinforcement yield strength fy =415

Shear Reinforcement yield strength fy =415Ok Ok.


11/68


12/68

STEP 4: (Define Frame section)


13/68

Define Column:From Main menu Define Frame section Add rectangular Material name

=M30 (select) section Name =C600x300M30Dimensions :Depth (3) = 600mmWidth (2) =300mm


14/68


15/68

Bar size =25 dCorner bar =25 dReinforcement to be designed OkOk.

Define Beam:

From Main menu Define Frame section Add rectangular Material name=M30 (select) Section Name=B230x700M30Dimensions:Depth (3) =700mmWidth (2) =300mm


16/68

Select Beam

Define Slab:

From Main menu define Wall/Slab /Deck section Add New slab


17/68

Section name = S1Material name = M30.MembraneMembrane =125 mmBending =125mm

Select Membrane Ok Ok.


18/68

STEP 5: (Drawing Columns, Beams, and Slabs)Drawing Columns:

From Main menu Draw Draw line objects Create column in region Property = C600x300M30 Select or Click on the column joints in Plan view (Left window) withsimilar storey

option. If necessary change angle =90 Change Property corresponding to columndesignation and click on respective column jointsClose.


19/68


20/68


21/68

Drawing Slab:

From Main menu Draw Draw area objects Create areas at click (Draw areas)

(Plan) Property =S1 Click on the periphery of column joints and press enter (With

similar storey option).


22/68


23/68


24/68

STEP 6:(Assigning Support Condition)

Set Base floor Plan view in left window Set Column points (with mouse)

From Main menu Assign Joint/Point Restraints (supports) Select Fixed

Ok.


25/68


26/68

To view Support assigned

From top Tool bar Set Building view option

Visible in view

Supports Ok.

Go to Elevation view 1 and view . For other views click arrow at top of tool bar.

STEP 7: (Defining Loads)

1.Gravity Loads (Dead Load & Live Load)

From Main menu Define Static Load Cases

Load = SIDL (Super Imposed Dead Load)Type = Dead

Self weight multiplier =0 Add New Load Ok.

Load = WallType= DeadSelf weight multiplier =0 Add New Load Ok.

Note:For Self weight multiplier will be 1 for beams and columns of dead load. For all otherloads, it will be zero.


27/68


28/68

Assigning the Loads:

Activate left window and set to Plan view Activate or select similar storey option (atbottom) and select all slabsFrom Main menu Assign

Shell / Area loads Uniform Load case name =SIDLUniform loadLoad = 1.50 Kn/m2 (units Kn.m)Direction Gravity Ok.

In the same manner assign Load case name = LiveUniform loadLoad = 2.0 Kn/m2 (units Kn.m)

Direction : Gravity Ok.


29/68


30/68


31/68

Assigning Wall loads:9 wall load = 11.176Kn/m (First to fourth floor)Ground floor =14.224Kn/m.Terrace floor=4.508Kn/m.In left side window select the beams in first to fourth floor by setting similar storey

options and view the status bar to know no. of beams selected


32/68

From Main menu Assign Frame /Line loads Distributed Load case name = wall. Unit Kn.m

ForcesDirection GravityUniform load=11.176 Kn/mReplace existing loads Ok.In the same manner apply Ground floor and terrace floor wall loads by setting single

storey option and assign the wall loads.

To see the load assigned :Right click the particular member corresponding load Ok.

Note:For point load :

From Main menu Assign Joint/Point loads Load case name =Dead. Units Kn.m.Replace existing loads

Forces Global =10 Kn Ok.


33/68


34/68


35/68


36/68


37/68

2. Wind Loads :In ETABS there are two ways to define lateral loads (Wind, earth quake). Built in optionwill automatically calculate lateral loads as per available design codes.

Define wind load parameters as per IS 875 --Part 3 (1987)From Main menu Define Static Load cases Load = X or Y

Type = WindSelf weight multiplier =0

Auto Lateral load =IS 8751987 Add New Load Select wind X load andclick on modify lateral loads to specify required wind load parameter. As per IS 875OkOk.

Creating dummy areas with property =None

Set required elevation view in right window From Main menu Draw Drawarea objects Draw rectangular areas Property = None Click on theperimeter of area and press enter.

Foot Note: Apply wind load for selections.To select wind area

Main menu Select By area object type select none Ok.

Assigning wind loads

Select drawing area of required elevation From Main menu Assign Shell/area loads Wind Pressure coefficients Wind load case name =Wind X

Coefficient Cp= - (Change if required) Ok.


38/68

To see wind load selectionSet Building view option Area section

Line section Ok.

3.Earthquake Analysis

In building, slab is considered as single rigid member during earthquake analysis.Select left side window.

Select all slabs by setting all floors/ similar storey option From Main menu Define Diaphragms Select D1 Modify/ Show diaphragms Select Rigid Ok Ok.


39/68


40/68

Define Mass SourceAs per IS 1893-->2002 25% of Live load is considered on all floors of building.From Main menu Define Mass source select From Loads Load =Dead; Multiplier -->1.0 AddLoad = Live; Multiplier =0.25 AddLoad =SIDL; Multiplier =1.0 Add

Load = Wall; Multiplier =1.0 Add Ok.


41/68

Define Earthquake Load (Static Method)From Main menu Define Static Load cases Load =EQXType = QuakeDefault Multiplier =0

Auto Lateral load = IS 18932002

Add New LoadSelect the load EQX Modify lateral load If required changevalues as per IS 1893 Select X DirectionSelect Program calc per code =0.36 (change as per requirement) Ok Ok.

Assigning DiaphragmsSet all storey option and select all slabs From Main menu Assign Shell area

Diaphragms D1 Ok.

To view the Diaphragm

Go to Set Building View objectsDiaphragm


42/68


43/68


44/68


45/68


46/68


47/68


48/68


49/68


50/68


51/68


52/68


53/68


54/68


55/68


56/68


57/68


58/68


59/68


60/68


61/68


62/68


63/68


64/68


65/68


66/68


67/68


68/68

Documents

Stepbystep Procedure for Modelinganddesign in Etabs