Etabs Complete Tutorial-Part-2

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Etabs Complete Tutorial Series

Etabs Tutorial

 Step Wise Modeling…. Continue

Step 4: Defining & Assigning Slabs.

  • Go to Edit tab
  • Edit storey & grid system data
  • Modify / show storey data
Height Elevation Master Storey Similar to  
Storey 3 3 9.45 No Storey 1  
Storey 2 3 6.45 No Storey 1  
Storey 1 3 3.45 yes Name  
P-storey 3 0.45 No Name  
Base 3 0      

 

  • Change Master storey P-storey =Storey 1 for Slab
  • Change similar to storey 2 = Storey 1
  • Change similar to storey 3 = Storey 1
  • Refresh view
  • Ok

Now

  • Go to define tab
  • Section properties
  • Slab sections
  • Add new property
  • Property name : S 140 ( i.e. 140 mm slab)
  • Slab material : M20
  • Modeling type : member
  • Under property data
  • Type : Slab
  • Thickness : 140 mm
  • Ok
  • Ok
  • Note: before Assigning , change one storey to similar storey
  • Now go to left side of screen & choose Draw Rectangular, floor/ Wall icon
  • Property : S 140
  • Close
  • Select to joint between assign a slab manual.

 

Or,

  • Whole select the object
  • Then select beam
  • Edit
  • Edit shell
  • Cookie wt floor option at selection
  • Check ,Extend frame
  • Apply
  • Ok

Note: To assign irregular frame

  • Select midpoint actual
  • Select draw floor/wall icon from left side
  • Select to column to mid point to column
  • Similarly for other irregular slabs.

Note: To assign Staircase

 

  • Go to define tab
  • Selection properties
  • Slab sections
  • Add new property
  • Under slab property data
  • Property name: Stair 200
  • Slab material: M20
  • Modeling type: membrane
  • Check, use special one-way /load distribution
  • Thickness: 250 mm
  • Ok
  • Property of object
  • Select : Stair 200
  • Close
  • Then manually assign for staircase slab

 To change one way load distribution (                   TO          )

  • Select the slab
  • Go to assign
  • Shell
  • Local Area
  • Rotation angle from defult orient : 90 degree
  • Apply
  • Ok
  • Clear display assigns.

Defining & Assigning Sunshade/ Cantilever Slabs.

Define

  • Go to define tab
  • Selection properties
  • Slab property
  • Add new property
  • Property name: Shade 120
  • material: M20
  • Modeling type: Shell thin
  • Check, use special one-way /load distribution
  • Thickness: 120 mm
  • Ok
  • Ok

      Note: before Assigning , Sunshade replicate / offset  beams to distance of 0.6 i.e. 600mm

To Offsetting:

 First select the beams that you want offset with help of CTRL

  • Go to EDIT tab
  • Replicate
  • Linear
      • Dx =  0m
      • Dy=  -0.6 m(-ve for Global-Y dirn)
  • Apply
  • Similar for Inclined beam
  • But , replication
  • Dx =0.6 along X-dirn
  • Dy= 0 m

Assign

  • Select draw floor / wall icon
  • Choose :shade 120 as property
  • Close
  • Joint
  • Now delete beams actually
  • Go to 3D vie

Step 5 :  Discuss later

Step 6 : Defining & Assigning  Shear wall

Example: Assign retaining wall/ Shear wall  of 20 cm thick on 3 side

Define:

  • Go to define tab
  • Selection properties
  • Wall section
  • Add new property
  • Property name: Retaining wall
  • material: M25
  • Modeling type: membrane
  • Thickness: 200 mm
  • All
  • Ok
  • Select : All stories from bottom layer

Asign:

  • Select draw wall icon from left side
  • Property : retaining
  • Close
  • Assign for wall on 3- sides
  • Go to 3D for check

How To view only shear wall,

  • Go to view menu  
  • Set display option
  • Uncheck, beams & floor
  • Apply
  • Ok

Go to Plan,

  • All stories
  • Select the column that joint with retaining wall select this and delete

To go to previous view,

  • go to view
  • Set display option
  • Check beam & floor
  • Apply

(Note:  To define that area is open space for this)

  • Go to Draw floor/ Plan icon
  • Property : opening
  • Assign

Step 7 :  Model  View Option

Option 1:

  • view
  • Set display option
  • Special effect
  • Check, extrude frames
  • Check, extrude shells
  • Apply
  • ok

 

Option 2:  (3D rendering)

  • view
  • Show 3D rendering

 

Assigning loads

  1. Assigning dead& Live Loads
  2. Assigning the wall loads
  3. Meshing of Slab
  4. Assigning seismic load
  5. Assigning load combination

 

  1. Assigning dead& Live Loads

Assign dead Load

 

  • Go to plan view
  • Select similar stories from bottom layer of etabs.
  • Select the slabs that we want to assign to dead load (1.5KN/M^2) except Staircase slab & shear wall
  • After selection
  • Go to Assign tab
  • Shell loads
  • Uniform
  • Put the value at load : 1.5 KN/M^2 ( For residential building D.L=1 as per Code)
  • Load pattern name : Dead
  • Ok

To assign dead load in staircase

  • Select Staircase slab
  • Go to Assign tab
  • Shell loads
  • Uniform
  • Put the value at load : 5 KN/M^2 ( For residential building 3KN/M^2 as per Code)
  • Load pattern name : Dead
  • Ok

Now, go to Top storey by Up Arrow Icon

  • For top slab (there will be water tank with capacity 10000 ltr) so we should change the value from Liter to KN & we should assign the load as a point loads at corners of slab.

  • Before assigning & selecting the Joint
  • Select One stories= Top storey from bottom layer of etabs
  • Select the corner joints
  • Go to assign Tab
  • Joint loads
  • Force
  • Force : Global Z = -25 KN (from Calculation)

Assign Live load/Imposed Load

  • Go to plan view
  • Go to Assign tab
  • Clear Display of Assign
  • Change to Similar stories from bottom layer
  • Select the slabs where you want to assign a live loads except ( Shear wall) make sure that staircase will be also selected .
  • Go to assign
  • Shell loads
  • Uniform
  • Load pattern name: Live
  • Load : 5 KN/M^2 (For Residential Building: Chose Live<=3 if defined and put 5KN/M^2  for Roof ,3 KN/M^2   for Balcony & Stair and 2 KN/M^2  for other area as per Code)
  • Direction: Gravity
  • Ok

Assign Live load in cantilever Slab:

  • Select Cantilever Slabs
  • Go to assign
  • Shell loads
  • Uniform
  • Load pattern name: Live
  • Load : 2 KN/M^2
  • OK

2.Assign Wall Load

  • Go to Define tab
  • Load patterns
  • Load pattern name: Masonry
  • Type : Super dead
  • Self wt. Multiplier : 0
  • Click on Add new load
  • Ok

Select the frame line (Where you want to assign Masonry loads)

  • Go to assign tab
  • Frame loads
  • Distributed
  • Load pattern name: Masonry
  • Uniform Load > load :12 KN/M ( wt = Gamma X Volume of wall)
  • If there is Opening take 80% value (=12X0.8) =10 KN
  • If there is Partion wall take =12/2=6 KN
  • If there is partion wall with opening take=(12X0.8)/2 KN
  • If there is parapet wall assign it also.
  • Apply
  • Ok
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