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ENG 7704 ENG 7704
Design of Steel Structures Design of Steel Structures
Analysis & Design of a Portal Frame using STAAD
Tamer SabrahPh.D Candidate of Civil Engineering
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Session 2Session 2 - - 2007 2007
PORTAL FRAME - PLANE STRUCTURE
4.5
m
H
W
6.0 m
2 3
1 4
Uniform Service Level Load, w
Dead Load = 1.50 kN/m’
Live Load = 2.50 kN/m’
Concentrated Service Level Wind Load,
H 10.0 kN acting towards the right at Joint 2
fixed hinged
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Main Steps of Modeling
Entering job information.
Building model geometry.
Defining member properties, sections.
Assigning loads (load cases,
combinations..)
Defining pre-analysis print out, analysis
type, and post-analysis printout.
Defining design requirements.
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Select from here the units,
that we will deal with.
Assume that we have m,
kN.
For a new file, select the
type of structure you want
to solve. Here select truss
type.
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The STAAD Graphical Environment will be invoked and the following screen
will appear:
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1. ENTERING JOB INFORMATION.
You MUST put a job name here
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How to Define the Frame Geometry?
1. Create nodes at certain coordinates and then connect
in between these nodes.
2. Use Construction lines
3. Draw it AutoCAD and Import as “.dxf ” file.
4. Using the Staad editor
5. Combination of all the above.
2. BUILDING MODEL (STRUCTURE) GEOMETRY
To the more
complicated
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REMEMBER TO SAVE YOUR WORK
FREQUENTLY
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After clicking Snap Node/Beam, use
the mouse and connect between
nodes created at the intersections of
construction lines.
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Property:
In which we can define or choose sections properties
of the members of the truss.
Spec.:
In which we can define or choose members’ specifications.
Support:
In which we can define the supports properties (restraints).
Load:
In which we can define the applied loads, load cases,
load combinations.
Material
In which we can define the material properties.
(ex. E, density, etc.)
3. DEFINING MEMBER PROPERTIES, SECTIONS.
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Property:
Assume Preliminary Sections:
Using the Canadian steel tables.
The frame girder is section
W 310 X 39
The columns are
W 410 X 39
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Assigning the sections created to the model
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Supports
By clicking on the support icon
the shown window will appear.
We have to create new kinds of
supports.
We have two kinds of supports
1. Fixed Support.
2. Hinged Support.
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Assigning Supports at nodes
Use the mouse and click on the nodes according to its support type as shown below
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How to see the frame full sections?
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You may change the member orientation by Right Click on the member,
Select Properties
Change in the Geometry Angle Beta
4. DEFINING LOADS
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For example:
Dead Load Case can be Load Case No. 1
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Live Load Case can be Load Case No. 2, and Wind Load is the load case No. 3
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We will create all load combinations needed at this stage, for
example:
.25 D.L. + 1.5 L.L + 1.0 W.L.
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In Dead Loads create the self weight definition
Self weight is defined in the
negative - Y direction
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For the D.L. and L.L. cases:
Create the Uniform Loads on the frame as specified before.
Make sure of the directions of forces according to the global coordinates.
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Dead Load Uniform load = - 1.5 kN/m
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Live Load Uniform load = - 2.5 kN/m
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Wind Load Nodal (concentrated) load = 10 kN/m
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Pre-Print
Analysis
Post-Print
In which we are choosing from differenttypes of structural analysis. The analysis typewe are required to do is a linear static type.
In which we are telling the program whatare the properties that we require to berecorded and printed in the output filesbefore performing the analysis.
In which we are telling the program what
are the properties that we require to berecorded and printed in the output filesafter performing the analysis.
5. DEFINING PRE-ANALYSIS, ANALYSIS TYPE, AND POST-PRINT.
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To specify the Analysis
command, first go to
Analysis/Print Page
from the left side of the
screen.
Then, click on the
Analysis sub-page from
the second row of
pages as shown below.
Choose Statics Checkand Click Add then
Close.
Analysis
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After creating the command of (Perform analysis - Static check ),
we have to assign the members for this type of analysis.
Click Assign, and then use the cursor and choose all the members,
hus all the members should be highlighted as shown below.
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PrePre--Print CommandsPrint Commands • Material Properties
•Support Information
•Member Properties
•Joint Coordinates
•….
•….
•Or we can choose All !
ADD which property
do you need and then use
cursor to Assign to which
members in the truss.
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Pre-Print To add the pre-print commands click
Define Commands
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After assigning the command to the members; the members should be highlighted
as shown and the correct green mark must be beside the command
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• Support Reactions
•Analysis Results
•Member Forces
•Max Force
•….
•….etc.
ADD which property
do you need and then use
cursor to Assign to which
members in the truss.
PostPost--Print CommandsPrint Commands
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PostPost--PrintPrintTo add the post-print commands click
Define Commands
The case that you will choose
here is the case will be used for
design.
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6. DEFINING DESIGN REQUIREMENTS.
To specify steel designparameters, go to Design |
Steel Page from the left side
of the screen. Make sure that
under the Current Code
selections on the top right
hand side, Canadian is
selected.
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We will use only to Check Code, regarding adequacy of members.
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STAAD performs Analysis and Design simultaneously.In order to perform Analysis and Design, select the Run Analysisoption from the Analyze menu.
STAAD Analysis engine is suitable for this tutorial. Click on the Run Analysis button.
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The solving process is shown in a pop-up screen!
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Visualization of Results
Note:
Generally, in any
program, try to make
some checks about the
shapes of deflections,
BMD, SFD. Also check
the level of reactions.
Just to make sure that
there is no significantinput error.
As shown in Tutorial 1 :
You can use the icons shown above to see the
straining actions (BMD, SFD, NFD, Deflections)
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OR > Viewing the Output File
During the analysis process, STAAD creates an Output file.
This file provides important information on whether the analysis
was performed properly.
For example, if STAAD.Pro encounters an instability problem during
the analysis process, it will be reported in the output file.
Alternatively, we can select the File | View | Output File | STAAD Output
option from the top menu.
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Please Refer to Session 1
When you make right click on any member and then click Properties
you will find the properties window as shown
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Shear / Bending moment diagrams and values for each load case and at different
sections of the Beam.
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Deflection diagrams and values for each load case and at different
sections of the Beam.
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Steel Design Results
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Link Members:
4.5
m
H
W
6.0 m
2 3
1 4fixed
Strut
If we had some members are link members, which only take the axial forces ---
Make Moment release to the members ends, this is done from the Member
Specification Definition
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From the Specification Menu
Select Beam
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Member Specification
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Assign the Release commands to the Link Member
Repeat Analysis
Questions ? Questions ?
ThanksThanks
This tutorial can be downloaded from the following link :
www.engr.mun.ca/~sabrahBrowse to my teaching page for tutorials and assignments
50505050© Tamer Sabrah - 2007