staad tut2

8/20/2019 Staad Tut2

1/9

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

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