etabs Module

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Extended 3D (Three-Dimensional) Analysis of Building Systems (ETABS 9.7.4) A Reinforced Concrete Two- Storey Residential Building Open Etabs 9.7.4 r ight corner of the window.  Edit the units at the bottom right Set it to N-mm o  Click New Model

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New Model Initialization will appear o Choose NO

OLOLRENDERS DESIGN, ENGINEERING AND CONSTRUCTION RM. 302 LAPERAL BLDG. SESSION ROAD BAGUIO CITY

PREPARED BY: ENGR. MIA CARINO

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B u i l d i n g P l a n G r i d S y s t e m a n d Story Data Definition Refer to the Framing Plans o

Edit Story Data Input Number of Stories, Typical Story Height and Bottom Story Height o First and second story Height= 3000mm o Bottom Storey Height (Embedment)= 1000mm o  Use Custom Story Data to add or edit a storey 



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B u i l d i n g P l a n G r i d S y s t e m a n d Story Data Definition Refer to the Framing Plans o

Edit Story Data Input Number of Stories, Typical Story Height and Bottom Story Height o First and second story Height= 3000mm o Bottom Storey Height (Embedment)= 1000mm o  Use Custom Story Data to add or edit a storey 



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Edit Uniform Grid Spacing If grid dimensions along x and y direct ions are the same o  Use Custom Grid Spacing If grid dimensions differ > Display Grid as Spacing o



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P a g e | 4 

Click OK if the Grid Data are all set  Click Grid Only > then Click OK

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Two Windows will appear Plan View & 3D View of the grids defined o



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DEFINE MATERIAL PROPERTIES

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Click add New Material

Edit Material Name > name it according to the strength of concrete  Type of Design > Concrete  Type of Material > isotropic  Design Property Data o Specified Comp Strength, fc’ = 21MPa 



6 Bending Reif, fy = 230 MPa (Grade 33) – Strength of Main Reinforcing Steel Bar Shear Reinf, fys = 230 MPa (Grade 33) – Strength of Confinement Bars (stirrups/ties) o  Edit Modulus of Elasticity of Concrete Ec= 4700 = 21538. 11 MPa o  Others are Default Properties of Concrete  Click OK o

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Click Ok

DEFINE FRAME SECTIONS (Refer to Beam and Column Schedule)



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Delete all of the properties shown Click and Drag all of the Properties > then Click delete property o o One property will remain



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Add New Frame Properties (refer to beam and column schedule) Add Rectangular (for beam and column section) o

SECTION PROPERTIES BEAM SECTIONS B1= 250X300 mm   B2= 200x300 mm TB= 250x250 mm 

Edit Section Name > B1-250x300 (based on section properties)  Edit Material > FC21  Edit Dimensions based on the section properties 



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Property Modifiers for All Beams > Set Modifiers

Click OK  Reinforcement > Design Type > Beam Concrete cover to rebar center = 40 + (diameter of stirrups) + (half of the diameter of main bars) o = 40 + 10 + 8 = 58mm 

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Click OK


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Do the same for other beam sections  You can now delete the remaining properties that you don’t need (W44x335)

COLUMN SECTION C1= 300x300 mm  

Add rectangular  Edit Section Name > C1-300x300 (based on sect ion properties)  Edit Material > FC21  Edit Dimensions based on the section properties



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Property Modifiers for All Columns > Set Modifiers

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Reinforcement Design Type > Column o Configuration of Reinforcement > Rectangular o Lateral Reinforcement> ties o cover to rebar center = 40 + (diameter of ties) + (half of the diameter of main bars) o = 40 + 10 + 8 = 58mm o Check/Design > Reinforcement to be designed



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Click OK

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After defining all of the section properties

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Click OK

DEFINE WALL/SLAB/DECK SECTIONS



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Click Add New Slab

SLAB SECTIONS S1 (one-way slab), thickness= 100mm  S2 (two-way slab) , Thickness = 120mm   Edit Section Name > C1-300x300 (based on sect ion properties)  Edit Material > FC21  Edit Thickness> 100mm for Membrane and Bending  Type> Membrane  Load Distribution> Use Special One-way (for One-way Slab Only)

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Set Modifiers For Slab (one-way and Two-way)



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Click Ok  Do the same for S2 (Two-way Slab) 

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You can delete other properties that you don’t need


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After defining all of slab sections > click Ok

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MODELLING OF STRUCTURE 

First draw the columns

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Properties of Object Select C1 under the Property Click and Drag to all grid points that have a column Do it for all the floors (roof, 2nd, 1st)

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Second, Draw the Beams

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Select Beam Section under the Property 1st storey – TB

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2nd storey – B1, B2 (depending on the framing plan) Roof – B2 Draw the beams by clicking on the grid with its corresponding beam section



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Third, draw the slab

m=

> 0.5 (two-way) < 0.5 (one-way)

 o

Select two-way under property Click and drag to the corners of the beam or from beam to beam edges (2nd storey Only)



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 o o

For the stairwell > draw rectangular properties (same as for slab) Under property> use Opening Click and drag to the corners of the stairwell



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LOADINGS I.

STATIC LOAD CASES  Define> static load cases  Define all static load cases (SW, SDL, EQXPE, EQXNE, EQYPE, EQYNE, WX, WY)



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Modify lateral load – EQXPE

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Modify lateral Load—EQXNE



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Modify lateral Load—EQYPE



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Modify lateral Load—EQYNE



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Modify lateral Load—WX



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Modify lateral Load—WY



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II.

LOAD COMBINATIONS Define > load combinations





Add new combo

LOAD COMBINATIONS (Refer to NSCP) 1.2SW + 1.2SDL + 1.6RLIVE ULC1 (1.2SW + 1.2SDL + 0.5RLIVE + 1.0EQXPE) o ULC2 (1.2SW + 1.2SDL + 0.5RLIVE + 1.0EQXNE) o ULC3 (1.2SW + 1.2SDL + 0.5RLIVE + 1.0EQYPE) o ULC4 (1.2SW + 1.2SDL + 0.5RLIVE + 1.0EQYNE) o ULC5 (1.2SW + 1.2SDL + 0.5RLIVE + 1.6WX) o ULC5 (1.2SW + 1.2SDL + 0.5RLIVE + 1.6WY) o  Click OK o



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

Click OK



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GRAVITY LOADS (refer to NSCP)

III.

DEAD LOAD 

Superimposed Dead Loads, SDL For slab: Ceiling = 0.2 KPa Utilities = 0.1 KPa Floor Toppings = 0.6 KPa Floor Finish = 0.6 KPa Movable Partitions = 0.5KPa Total = 2.0 KPa

For Walls: Exterior Walls = 2.73KPa x 3m = 8.20 KN/m Interior Walls = 2.11KPa x 3m = 6.33 KN/m LIVE LOAD 

Basic Floor Area

= 1.90 KPa



Exterior Balconies

= 2.90 KPa

For Slab: (2nd Floor) 

Select all slab > assign > shell area loads > uniform



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 

Click OK Select all slab > assign > shell area loads > uniform

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Click OK

For Walls: (2nd Floor) 

Select all exterior walls > assign > Frame/ Line Loads > Distributed



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 

    

Load Case Name > SDL Uniform Load > 8.20 KN/m

Click OK Select Interior walls Assign > frame/line loads > distributed Load Case Name > SDL Uniform Load > 6.33 KN/m



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Click OK

Note: if the Interior walls are not on top of the beams drawn. Draw beams for walls as indicated in the floor plans (Property: NONE) then assign the necessary loads. For Roof:  

 

Select the joints supporting the truss Assign > Joint/ Point Loads > Force

Load Case Name > SDL Force Global Z: -40KN (Compute truss support reactions)



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Click OK

Check if the gravity loads are assigned  

Select the 3D View Display > Show Loads > Frame/Line



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IV.

Click OK

WIND LOAD

WX (windward) 

set elevation view



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   

click A (Elevation A : windward along x direction) click OK Draw rectangular areas for walls Property: NONE

Select areas at Elevation A OLOLRENDERS DESIGN, ENGINEERING AND CONSTRUCTION RM. 302 LAPERAL BLDG. SESSION ROAD BAGUIO CITY 


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Assign > shell/ area loads > wind pressure c oefficient

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Wind Load Case Name: WX Wind Pressure Coeff, Cp = 0.80 Windward Click OK

  

 

Go to Plan View Check direction of Windward Coefficient along X



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WX (leeward) 

set elevation view

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click C (Elevation C : leeward along x direction) click OK draw rectangular areas for walls Property: NONE

  



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 

   

Select areas at Elevation C Assign > shell/ area loads > wind pressure coefficient

Wind Load Case Name: WX Wind Pressure Coeff, Cp = 0.50 Leeward Click OK



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 

Go to Plan View Check direction of Leeward Coefficient along X

WY (windward) 

set elevation view

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click 1 (Elevation 1 : windward along y direc tion) click OK draw rectangular areas for walls

 



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Property: NONE

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Select areas at Elevation 1 Assign > shell/ area loads > wind pressure c oefficient

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   

 

Wind Load Case Name: WY Wind Pressure Coeff, Cp = -0.80 Windward Click OK

Go to Plan View Check direction of Windward Coefficient along Y



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WY (leeward) 

set elevation view



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click 3 (Elevation 3 : leeward along y direction) click OK draw rectangular areas for walls Property: NONE

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Select areas at Elevation 3

 



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Assign > shell/ area loads > wind pressure coefficient

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Wind Load Case Name: WY Wind Pressure Coeff, Cp = -0.50 Leeward Click OK

  

 

Go to Plan View Check direction of Leeward Coefficient along Y



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MESHING  

  

Ctrl+A Assign > shell/ area> area object mesh options

Click auto mesh object into structural elements > click all Further subdivide auto mesh with maximum element size of 1000 Ram and Wall Meshing Options > click Subdivide object into elements with max size of 1000



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Click OK



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Ctrl + A Assign > shell/area > auto line constraint

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Click OK

DIAPHRAGM  

Ctrl + A Assign > shell/area > diaphragms

 


click D1 Modify/show diaphragm > rigid


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Click OK

SPECIAL SEISMIC LOAD EFFECTS

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Omega factor > user defined= 2.80

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Click OK

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Define > special seismic load effects

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Rho Factor > user defined =1

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DL multiplier = 0.30

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Design category = D, E or F



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MASS SOURCE 

Define > mass source



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  o o

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Click from loads Define mass multiplier SW=1 SDL=1 Click OK



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ANALYSIS 

Analyze > check model

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Check all > Click OK

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Warning will appear If No warning messages will appear > proceed to analysis If there are warning messages > check your model

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Analyze > Run Analysis

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Deformed shape of structure will appear Deformed shape of every load cases (SDL, RLIVE, EQX… etc.)

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DESIGN 

Design > Concrete Frame Design > select design combos

Design load combinations selection will appear Select all under Design Combos > click  remove 

 

Select all load combinations that you defined > click add Click OK



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Design > concrete frame design > start design/ check of structure

LONGITUDINAL REINFORCEMENTS 

Longitudinal reinforcements will appear (area of steel)



etabs Module

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