ENG 7704ENG 7704

Design of Steel StructuresDesign of Steel Structures

Analysis & Design of a Steel Floor using STAAD

Tamer SabrahPh.D Candidate of Civil Engineering

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Session 3: July 10, 2006Session 3: July 10, 2006

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SteelSteel Floor PlanFloor Plan

Main vertical Loadsare:

Own weight

Flooring = 1.5 kn/m2

Live Loads = 2.0 kn/m2

Main Steps of ModelingEntering 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 the units are:

meter, & kilo Newton.

For a new file, select the

type of structure you want

to solve.

Select Floor type

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OPEN A NEW FILE: FLOOR TYPEOPEN A NEW FILE: FLOOR TYPE

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GO TO EDIT JOB INFORMATIONGO TO EDIT JOB INFORMATION

1. ENTERING JOB INFORMATION.

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2. BUILDING MODEL (STRUCTURE) GEOMETRY

Create the required grids to create beams along

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Create The Beams Over The Grid Construction Lines In The XCreate The Beams Over The Grid Construction Lines In The X--ZPlaneZPlane

Property:In which we can define or choose sections propertiesof 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.

MaterialIn which we can define the material properties. (ex. E, density, etc.)

3. DEFINING MEMBER PROPERTIES, SECTIONS.

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Assume your beams crossAssume your beams cross--sections following the Canadian Tablessections following the Canadian Tables

Assigning the sections created to the model

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To View a Rendered View for the Full Cross Sections To View a Rendered View for the Full Cross Sections

(Important to Check Orientations)(Important to Check Orientations)

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Zoom In for the Rendered ViewZoom In for the Rendered View

Define Supports Locations

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Sec. Beams are simple beams, so Create A Moment Release Sec. Beams are simple beams, so Create A Moment Release around the Zaround the Z--Axis for the Secondary Beams at the intersections Axis for the Secondary Beams at the intersections with the Main Girders.with the Main Girders.

4. DEFINING LOADS

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Create your Different Primary load CasesCreate your Different Primary load Cases

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Define Load as Floor Load TypeDefine Load as Floor Load Type

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Distribution all over the floor (TwoDistribution all over the floor (Two--Way Distributed)Way Distributed)

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Click here if you want to make the load distribution becomes one way

For ONE WAY loads, the program attempts to find the shorter direction within panels for load generation purposes.

So, if any of the panels are square in shape, no load will be generated for those panels. For such panels, use the FLOOR LOAD type.

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One Way Distribution: One Way Distribution:

Take care: It will not put load for twoTake care: It will not put load for two-- way slabsway slabs

Self weight is defined in the negative - Y direction

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Define Self Weight in the Global YDefine Self Weight in the Global Y--directiondirection

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To remove the load from over the opening area: Put an equal loadTo remove the load from over the opening area: Put an equal loadbut opposite in direction over that area.but opposite in direction over that area.

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Create Load CombinationCreate Load Combination

Pre-Print

Analysis

Post-Print

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

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

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.

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 Check and Click Add then Close.

Analysis

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PrePre--Print CommandsPrint Commands • Material Properties

•Support Information

•Member Properties

•Joint Coordinates

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ADD which property do you need and then usecursor to Assign to which

members of the floor.(or assign to all)

• Support Reactions

•Analysis Results

• Member Forces

• Max Force

PostPost--Print CommandsPrint Commands

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ADD which property do you need and then usecursor to Assign to which

members of the floor.(or assign to all)

6. DEFINING DESIGN REQUIREMENTS.

To specify steel design parameters, go to Design | Steel Page from the left side of the screen. Make sure that under the Current Codeselections on the top right hand side, Canadian is selected.

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We will use here Check Code, regarding adequacy of members.

Also, we will use the Select Option to optimize the design.

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Now, the model is ready to run analysisNow, the model is ready to run analysis

Remember: if you use the select option, your results will be showed for the selected members made by Staad.

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 significant input 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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SHEAR FORCE DIAGRAMSHEAR FORCE DIAGRAM

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BENDING MOMENT DIAGRAMBENDING MOMENT DIAGRAM

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DEFLECTION ANIMATIONDEFLECTION ANIMATION

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Viewing the Output FileDuring the analysis process, STAAD creates an Output file. This file provides important information on whether the analysiswas 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 Outputoption from the top menu.

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STAAD OUTPUTSTAAD OUTPUT

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HOW TO CREATE OUTPUT STAAD REPORT?HOW TO CREATE OUTPUT STAAD REPORT?Post Processing / Reports

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Select the Sections you want to be included in the report as shown below:

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The report can be printed out directly from Staad or Exported as Word or text file

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Questions ?Questions ?

ThanksThanks

This tutorial can be downloaded from the following link :www.engr.mun.ca/~sabrah/Staad-Tut3.pdf

41414141© Tamer Sabrah - 2006