ETABS & SAP Step by Step

CAA & DOS

ETABS & SAP

Lecture No: 01 ETABS stands for “Extended 3D Analysis of building systems” In this software we have to follow the scheme as given below: 1. 2. 3. 4.

Modeling Properties Assigning (like dimensions of beams & columns and type of foundation etc) Loading Design

Notes: • • • • • • • • •

“Wetting” means to cross check the work one’s person. The one who cross checks is called ‘Wetter’. PBC stands for ‘Pakistan Building Codes’ ETAB is quite goog for the concrete structures. Generation of results is very convinent in ETAB ETAB, SAP & STAAD results for the slab case are not satisfactory. While SAFE gives relative better results for Slab design. Wood, Aluminium, concrete etc all materials based buildings can be design on STAAD. STAAD gives more conservative results, as the factor of safties used in STAAD are greater. In ETAB at any stage units can be changed. Results of ETAB for steel Trusses are also satisfactory.

INSERT WINDOW HAVING DIFFERENT VIEWS Click Options – Windows

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CAA & DOS

ETABS & SAP These arrows buttons are the Move up/down list. These keys will active when the plan view is active. We can shift the boarder line using there arrows, inorder to get the required one image (either Plan view or Elevation) of any floor or side.

Notes: • • •

In order to deselect the slection, Esc will not work. Use the button in the side vertical tool bar. Use button to shift the mode on ‘Snap to Grid intersection & points’ Use button to pick the intersection points other than grid intersections.

MODLEING Select the units at the very first stage.

Step No: 01 a) Click Menu Bar ‘File’ button b) Click New Model Press NO a) Click Grids Only & press OK Step No: 02 b) Edit/Edit Grid Data/Edit Grid c) Select ‘Global’ under the heading of System. d) Click ‘Modify/show system’

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CAA & DOS Step No: 03 a) b) c) d)

Select ‘Ordinate or Spacing’ Type spacing values for X & Y Grids Check (Primary, show, top, color etc) Click OK and then agin press OK

Step No: 04 a) b) c) d) e)

If needed: Edit/Edit StoryData/Insert Story Edit/Edit StoryData/Edit Story Rename ‘Label’ acc. to ur choice Modify Heights (as per requirements) Press OK

Step No: 05 a) In vertical side tool bar, select ‘Draw Line’ tool b) Draw beams and columns as per requirements *Beams are placed in Plan view and Columns are placed in Elevation View. *Select ‘All Stories’ as mentioned below:

Step No: 06 a) For Render View - Click ‘set building view option’ button. b) Check the ‘Extrusion’ under spwcial effects. Step No: 07 (GL-VIEW) a) Select the 3D view window b) View/Create openGL-view

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ETABS & SAP

CAA & DOS

ETABS & SAP

Lecture No: 02 Notes: •

Modeling of lift case & retaining wall is necessary.

•

Thumb Rule for the slab thickness: Slab thickness =

• • •

Or divide the Slab perimeter by ‘15’ to get answer in Inches. Mostly it happens when beam fails, column also fails. -ive moment of the beam is resisted by column.


   

We have to increase the colmn’s no. or dimension, whenever the span changes (increases) Steel in column is usually 1 – 3% of the cross sectional area of column. ACI – gives provisions for the static loadings. UBC & IBC – for dynamic loadings. (UBC = Universal building codes) In ETABs distances are measured from C/C.

• • • •

If fc’ is given in kips-in, check it out in which units u r working. If in kips-ft u r working then convert fc’ in kips-ft as: let, 4 x 144 = 576 kips-ft In case of concrete – stresses at all points are taken same – isotropic If you know the name of ur slab type, then u can select all the slab pannels at atime. The optin is in one of the tabs in menu bar. When & where, there are calculations – Engineering is needed.

PROPERTIES ASSIGNING Step No: 01

Draw Slab

a) “Draw Area” toolbar *havig three typres: Irregular, Square/Rectangular & Create area at click Step No: 02 a) b) c) d)

Assign support conditions to columns and beams

Select Plan View – Select Base Plan Select point with the help of window (one story must – i.e., base) Click Assign/joint-points/Restraints(supports) Select support type (like fix)

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CAA & DOS

ETABS & SAP

e) Press OK Step No: 03

Define Properties

a) Click Define/Materials b) Select CONC/Modify/Type fc’ and fy (keep eye on units) c) Press OK Step No: 04 a) Click Define/Frame section b) Select rectangular or circular (as per need) from drop down of “ add/wide flange” c) Select material

d) Type selection name (like beam) and Type dimension according to units e) Select Reinforcement f) Check beam-column/shape/ckeck-reinforcement to be designed Step No: 05

Define Slab section properties

a) Click Define/Wall-slab-deck section *Either modify the SLAB1 or insert ur own new one b) Add new Slab c) Define the type, thickness and material

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CAA & DOS

Step No: 06

ETABS & SAP

Assigning Properties

a) Select Beam/Column b) Click Assign/Frame-line/Frame section/Color beam Step No: 07 a) Select all Slab (all pannels) b) Click Assign/Shell Area/wall-slab-deck section

Lecture No: 03 Analysis & Design Notes: • •

While transfering the Autocad (Grids) file into ETABS, be sure that all grids must be in single layer and only grids’ layer will be active at that time. Save As – file in .dxf format

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ETABS & SAP

Wt. per unit volume = 150 lb/cft Wt. per unit mass = 4 * w = mg and if g = 32 Since

then

m = 150/32 = 4.6875

Ec = 57000 ′ (where fc’ in psi)

Note: If you have fc’ value other than 4000 psi then by manually put that value.

Poisson’s Ratio ranges from 0.2- 0.5 Shear Modulus =

• •

   

Membrane – Whole slab thickness Bending – Effective depth

For slab case put same values in membrane and Bending. •

Shear Reduction Factor in light weight concrete is 1.

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CAA & DOS

ETABS & SAP

In heavy concrete structures “iron chips” is used now a days. UBC – chapter 16 is about ‘Seismic Details’ LOAD CASE: 1. 2. 3. 4. 5.

D.L L.L R.L.L Seismic load in x-direction Seismic load in y-direction

Weight: ½” Plaster = 3” Mud =

" 

1-½” Tites =

. 

× 120 = 5

× 120 = 30 . 

× 110 = 13.7

__________________ = 50 lb/sft * Select the soil type on the basis of SPT-value, using UBC. Also the Seismic Zone Factor is also provided by the UBC against different zones. Step No: 01. Define Load Case a) b) c) d) e)

Define/Static load case Type load name (let DL, LL, RLL, SEISMIC-in x & y direction etc) Select “Type” (Dead, Live, Quake etc) according to your condition. Set Wt. multiplier (For Dead 1 and for Live 0) Click Add New Load & press OK (In case of seismic loading also set the UBC 97)

Step No: 02 Modify Lateral Load (Seismic in X & Y direction) a) Define/static load case/Modify lateral load/select direction - select soil type - select zone & press OK

Compiled By: Syed Saqib Mehboob (06-CE-50)

CAA & DOS

Compiled By: Syed Saqib Mehboob (06-CE-50)

ETABS & SAP

CAA & DOS

ETABS & SAP

Step No: 03 Loading Values Let

D.L = 50 lb/sft

L.L = 60 lb/sft

R.L.L = 20 lb/sft

Wall load = 1 k/ft (over all beams) Step No: 04 a) Select all slabs – Assign/(Shell/area load)/uniform b) Select Dead or Live – Type value – check Gravity & Replace Existing Loads

Step No: 05 a) Select Beams – Assign/Frame line load/ Point OR UDL (whatever u need)

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CAA & DOS

Step No: 06

ETABS & SAP

Add Default design combinations

b) Define/Add default combination c) Check – concrete frame design

Step No: 07

Analysis & Design

a) Analyze/Set analyses option/Full-3D and OK b) Analyze/Run Analysis or Press F5 c) Click Design/concrete frame design/start design * By default after design you will get “Longitudinal reinforcement”. You can get % ratio etc. Follow the steps: i. ii.

Design/concrete frame design/display design information Choose your required information type

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CAA & DOS

ETABS & SAP

•

To end the analysis press

•

Select any member and press right click on it details will come out and click summary.

button

How to change code?

Compiled By: Syed Saqib Mehboob (06-CE-50)

CAA & DOS Lecture No: 04

ETABS & SAP LOAD CALCULATION

Notes: • • •

Show selection only – Select only particular beam in elevation view and then go: View/show selection only and then turn elevation view into 3D view. In footing design we do not use factored load – we use service loads. In commercial structures slab thickness may vary from place to place.

Step No: 01

Add new combination

a) Define/Load Combinations/Add new combo…/Type load combination name b) Type Case name (Dead, Live etc)/Type scale factor and then press ADD. Now press OK

Service combination: 1DL + 1LL + 1RLL Factored Combination: 1.2DL + 1.6LL + 1.6RLL

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CAA & DOS

ETABS & SAP

To Check the Errors in the model: Analysis/Check model Show Deformed & Un-deformed shape: Display/show deform shape – (against specific load case i.e Dead or Live etc) Application of Point Load: a) b) c) d)

Assign/(Joint/point load)/Force Select load case and type value of load with +ive or –ive sign as per condition. Addition of self made design combination Design/Concrete frame design/Select design combination.

Be sure under ‘Design Combos’ only that combination will be there on which you need the design. So using the Add-> AND