Staad Pro Tutorial

PORTAL FRAME - PLANE STRUCTURE W

ENG 7704

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H

Design of Steel Structures Analysis & Design of a Portal Frame using STAAD

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4.5 m

Tamer Sabrah Ph.D Candidate of Civil Engineering

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fixed

4 hinged

6.0 m Session 2 - 2007 1

Uniform Service Level Load, w Dead Load = 1.50 kN/m’ Live Load = 2.50 kN/m’ Concentrated Service Level Wind Load, H Æ 10.0 kN acting towards the right at Joint 2

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Main Steps of Modeling For a new file, select the

¾Entering job information. ¾Building model geometry. ¾Defining member properties, sections. ¾Assigning loads (load cases, combinations..) ¾Defining pre-analysis print out, analysis type, and post-analysis printout. ¾Defining design requirements.

type of structure you want to solve. Here select truss type.

Select from here the units, that we will deal with. Assume that we have m, kN.

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The STAAD Graphical Environment will be invoked and the following screen will appear:

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2. BUILDING MODEL (STRUCTURE) GEOMETRY

1. ENTERING JOB INFORMATION.

How to Define the Frame Geometry? You MUST put a job name here

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.

To the more complicated 7

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After clicking Snap Node/Beam, use the mouse and connect between nodes created at the intersections of construction lines.

REMEMBER TO SAVE YOUR WORK FREQUENTLY

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3. DEFINING MEMBER PROPERTIES, SECTIONS. Property: In which we can define or choose sections properties of the members of the truss.

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Property: Assume Preliminary Sections:

Spec.: In which we can define or choose members’ specifications. Support: In which we can define the supports properties (restraints).

Using the Canadian steel tables. The frame girder is section W 310 X 39 The columns are W 410 X 39

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.) 11

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Assigning the sections created to the model

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

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How to see the frame full sections?

Use the mouse and click on the nodes according to its support type as shown below

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4. DEFINING LOADS

You may change the member orientation by Right Click on the member, Select Properties Change in the Geometry Angle Beta

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For example:

Live Load Case can be Load Case No. 2, and Wind Load is the load case No. 3

Dead Load Case can be Load Case No. 1

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We will create all load combinations needed at this stage, for example: 1.25 D.L. + 1.5 L.L + 1.0 W.L.

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.

Dead Load Uniform load = - 1.5 kN/m

Make sure of the directions of forces according to the global coordinates.

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Live Load Uniform load = - 2.5 kN/m

Wind Load Nodal (concentrated) load = 10 kN/m

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5. DEFINING PRE-ANALYSIS, ANALYSIS TYPE, AND POST-PRINT.

Analysis To specify the Analysis command, first go to Analysis/Print Page from the left side of the screen.

Pre-Print

In which we are telling the program what are the properties that we require to be recorded and printed in the output files before performing the analysis.

Analysis

In which we are choosing from different types of structural analysis. The analysis type we are required to do is a linear static type.

Post-Print

In which we are telling the program what are the properties that we require to be recorded and printed in the output files after performing the analysis.

Then, click on the Analysis sub-page from the second row of pages as shown below. Choose Statics Check and Click Add then Close.

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After creating the command of (Perform analysis - Static check), we have to assign the members for this type of analysis.

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PrePre-Print Commands

Click Assign, and then use the cursor and choose all the members, thus all the members should be highlighted as shown below.

• 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

After assigning the command to the members; the members should be highlighted

Define Commands

as shown and the correct green mark

must be beside the command

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PostPost-Print Commands

• Support Reactions

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PostPost-Print

•Analysis Results

To add the post-print commands click Define Commands

•Member Forces •Max Force •…. •….etc. The case that you will choose here is the case will be used for

ADD which property

design.

do you need and then use cursor to Assign to which members in the truss. 33

6. DEFINING DESIGN REQUIREMENTS.

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We will use only to Check Code, regarding adequacy of members.

To specify steel design parameters, 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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STAAD performs Analysis and Design simultaneously. In order to perform Analysis and Design, select the Run Analysis option from the Analyze menu.

STAAD Analysis engine is suitable for this tutorial. Click on the Run Analysis button.

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Visualization of Results

The solving process is shown in a pop-up screen!

As shown in Tutorial 1 : You can use the icons shown above to see the straining actions (BMD, SFD, NFD, Deflections)

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 significant input error.

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When you make right click on any member and then click Properties

OR > Viewing the Output File

you will find the properties window as shown

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.

Please Refer to Session 1

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Shear / Bending moment diagrams and values for each load case and at different

Deflection diagrams and values for each load case and at different

sections of the Beam.

sections of the Beam.

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Steel Design Results

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Link Members: W 2

H

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Strut

4.5 m

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fixed

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6.0 m 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 45

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Member Specification

From the Specification Menu Select Beam

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Add moment release command for the Start and the End of the member

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Assign the Release commands to the Link Member Repeat Analysis

Questions ? Thanks This tutorial can be downloaded from the following link :

www.engr.mun.ca/~sabrah Browse to my teaching page for tutorials and assignments

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© Tamer Sabrah - 2007

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