Etabs Tutorial MSc Nguyen Thanh Tu
Example 2
A frame with parameters as follows:
Concrete: B25: E = 2,7e7 Pa, =0.2.
Loads: Dead loads (DL).
- Live loads (LL).
- Wind Loads include left-wind load (LWL) and right-wind load (RWL)
Using Etabs to determine the internal forces of the frame?
a. Frame b. dead load
c. Live load d. Left-wind Load
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Load combinations as follow:
-Com1: DL + LL
-Com2: DL + LWL
-Com3: DL + RWL
-Com4: DL + 0.9 LL + 0.9 LWL
-Com5: DL + 0.9LL + 0.9 RWL.
-Enve (com1 ; com2; … com7).
e. Left-wind Load
AXES SYSTEM IN ETABS
In Etabs, there are two types of axes system: Global and Local Axes.
1. GLOBAL AXES are x, y, z which are perpendicular together.
2. LOCAL AXES are 1 (red color), 2 (white color) and 3 (Blue color) which determine
the orientation of the internal forces and the object.
a) Determine the local axes of Vertical Frame Objects.
Local axis 1 is along the frame object. The positive
local 1-axis is in the same direction as the positive
global Z-axis, upward.
Local axis 2 is perpendicular to the frame object.
The projection of the positive local 2-axis onto the
global X-axis is in the same direction as the positive
global X-axis.
Local axis 3 is perpendicular to the frame object. The direction of the positive local
3-axis is determined from applying the right-hand rule using the directions of the 1
and 2 axes described in the preceding bullets.
b) Determine the local axes of Horizontal Frame Objects. For horizontal frame
objects (parallel to the global X-Y plane), the local axes have the following
default orientation:
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Local axis 1 is along the frame object. The projection
of the positive local 1-axis onto the global X-axis is in
the same direction as the positive global X-axis. If the
frame object is parallel to the global Y-axis such that
there is no projection onto the global X-axis, the
positive direction of the local 1-axis is the same as the
direction of the positive global Y-axis.
Local axis 2 is perpendicular to the frame object. The
positive local 2-axis points in the same direction as the
global Z-axis, upward.
Local axis 3 is perpendicular to the frame object and is horizontal. The direction of
the positive local 3-axis is determined from applying the right-hand rule using the
directions of the 1 and 2 axes described in the preceding bullets.
c) Determine the local axes of General Frame Object (neither vertical nor
horizontal) Frame Objects.
Local axis 1 is along the frame object. The positive local 1-
axis has an upward sense. The projection of the positive
local 1-axis onto the global Z-axis is in the same direction as
the positive global Z-axis, upward.
Local axis 2 is perpendicular to the frame object. The local
1-2 plane is vertical. The positive local 2-axis has an upward
sense. The projection of the positive local 2-axis onto the
global Z-axis is in the same direction as the positive global
Z-axis, upward.
Local axis 3 is perpendicular to the frame object and is horizontal. The direction of
the positive local 3-axis is determined from applying the right-hand rule using the
directions of the 1 and 2 axes described in the preceding bullets.
• Note: To show local axes of frame: View →Set Building View Options or Click ;
choose: Line local axes.
d) Determine the local axes of Shell/Area Element:
The local axis 3 is always normal to the plane of the shell object. This axis is directed
toward you when the path of the joints defining the shell object appears counterclockwise,
as shown in the figure to the right. The default orientation of the local 1 and 2 axes is
determined by the relationship between the local 3 axes and the global Z axis follows:
The local 3-2 plane is taken to be vertical; that is, parallel to the Z axis.
The local 2-axis is taken to have an upward (+Z) sense unless the element is horizontal,
in which case the local 2-axis is taken to be horizontal along the global +Y direction.
The local 1-axis is always horizontal; that is, it lies in the X-Y plane.
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3. Internal forces of frame
4. Internal forces of Shell/Area
Tutorials
I. DEFINE MODEL
1.1. Open Etabs program.
1.2. Change Unit.
Choose kN-m
Chọn đơn
vị KN-m
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Etabs Tutorial MSc Nguyen Thanh Tu
1.3. New Model Initialization.
Menu File > New Model
(or click mouse-left to the symbol)
- Choose “NO”
Edit the gird of model
Edit the story height of model
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Etabs Tutorial MSc Nguyen Thanh Tu
• Set Elevation view
Menu View → Set Elevation or click:
• Note: remember to Save file regularly. Each model should be in a folder.
1.4. Define parameter
a. Define material
Menu Define > Material Properties or click
There is a dialog box:
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Etabs Tutorial MSc Nguyen Thanh Tu
Isotropic:
Mass per unit Volume: Weight per unit Volume:
Modulus of Elasticity: Poission’s Ratio:
Coeff of The Thermal Expansion Shear Modulus (chương trình tự tính)
Orthotropic:
b. Define frame section.
Menu Define > Frame Sections or click
• Note : Beam : Bhxb
Column : Cx×y
T3:
T2 :
c. Define Static Load Cases
Menu Define > Static Load Cases or click:
d. Define Load Combinations
Menu Define > Load Combinations or click
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II. MODELING AND ANALYSIS
2.1. Modeling columns, beams, walls, slabs…
- Draw beams of model:
Set plan view > Story 1
Turn into mode: Similar Stories
Menu Draw > Draw Line Objects > Draw Lines in Region or at Clicks (Plan, Elev, 3D) or
click
Or Menu Draw > Draw Line Objects > Draw Lines (Plan, Elev, 3D) or click
- Draw Columns of model:
Method 1:
Set plan view that want to draw columns
Turn off Similar Stories mode???
Menu Draw → Draw Line Objects→Create Columns in Region or at Click (Plan) or click
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Method 2:
Set elevation of view.
Drawing columns by or
- Set Building View Options:
Menu View →Set Building View Options hoặc Click
2.2. Assign Restrains (Supports)
Choose points that need restrains.
Menu Assign → Joint/Point→ Restrains (Supports) or click
Fully supported: All degrees of freedom are restrained
Pinned: All three translational degrees of freedom are restrained
Roller: Only the vertical (translation 3) degree of freedom is restrained.
Fully free: All degrees of freedom are unrestrained.
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• Note: if there is a wrong restrain, ......
• Checking the model before assigning loads:
- Checking Gird, Story Height
Edit gird: Menu Edit→ Edit Grid Data→ Edit Gird or right-click on screen and choose Edit
Grid Data
Edit story height: Menu Edit→ Edit Story Data→ Edit Story or right-click on screen and
choose Edit Story Data.
Insert or delete story: Menu Edit→ Edit Story Data→ Edit Story, choose Insert Story or
Delete Story
- Checking model: Checking numbers, sections, restrains…
2.3. Assigning loads
a. Point Loads
Stages: - Choose points that need to be assigned point loads.
- Menu Assign→ Joint/Point Load →Force
b. Frame/Line Loads
There are 2 types: Point Loads and Distributed Loads.
Stages:- Choose the beams/lines.
- Distributed Loads: Menu Assign→ Frame/Line Loads → Distributed… or click
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- Point Loads: Menu Assign→ Frame/Line Loads → Point… or click
Example: Assigning Super Dead loads (Distributed Loads)
- Choose the beams/lines.
- Menu Assign→ Frame/Line Loads → Distributed…or click
• Note: It is important to check everything before running.
2.4. Show/display Loads ; Elements
Show point loads: Menu Display > Show Loads > Point Loads
Show point loads or distributed loads of Frame/line Loads: Menu Display > Show Loads >
Frame Lines> Show Frame/Line Loads
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2.5. Set analysis Options and Run.
- Menu: Analyze→ Set analysis Options:
- Save and Run: Menu Analyze → Run Analysis or click or press F5
I. RESULT
1.1. Show Deformed Shape.
Menu Display→ Show Deformed Shape or click:
1.2. Show Member Forces/Stress Diagram.
Menu Display > Show Member Forces/Stress Diagram > Frame/Pier/Spandrel Forces or
click and choose Frame/Pier/Spandrel Forces
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1.3. Show Support/Spring Reactions
Menu Display > Show Member Forces/Stress Diagram > Support/Spring Reactions or
click-left and choose Support/Spring Reactions
1.4. Export to Execl.
Menu Display →Show tables
Choose Displacement or/and Reaction or/and Frame Output.
Choose Load Cases.
After click “Ok” There is a dialogue box
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• Note: Copy (Ctrl + C) to excel to handle.
1.5. Export to File.txt.
Menu File → Print Tables → Analysis Output.
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