Staad Tutorial - 3

ENG 7704

Design of Steel Structures Analysis & Design of a Steel Floor using STAAD

Tamer Sabrah Ph.D Candidate of Civil Engineering

Session 3: July 10, 2006 1

Steel Floor Plan Main vertical Loads are: Own weight Flooring = 1.5 kn/m2 Live Loads = 2.0 kn/m2

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Main Steps of Modeling 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. 3

OPEN A NEW FILE: FLOOR TYPE For a new file, select the type of structure you want to solve. Select Floor type

Select from here the units, that we will deal with. Assume that the units are: meter, & kilo Newton.

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GO TO EDIT JOB INFORMATION

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1. ENTERING JOB INFORMATION.

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2. BUILDING MODEL (STRUCTURE) GEOMETRY

4 1 Create the required grids to create beams along

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Create The Beams Over The Grid Construction Lines In The X-ZPlane

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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. 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.) 9

Assume your beams cross-sections following the Canadian Tables

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Assigning the sections created to the model

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To View a Rendered View for the Full Cross Sections (Important to Check Orientations)

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Zoom In for the Rendered View

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Define Supports Locations

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

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4. DEFINING LOADS

Create your Different Primary load Cases

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Define Load as Floor Load Type

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Distribution all over the floor (Two-Way Distributed)

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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.

Click here if you want to make the load distribution becomes one way 19

One Way Distribution: Take care: It will not put load for two- way slabs

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Define Self Weight in the Global Y-direction

Self weight is defined in the negative - Y direction

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

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Create Load Combination

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

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.

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Analysis 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. 25

Pre-Print Commands

• Material Properties •Support Information •Member Properties •Joint Coordinates

ADD which property do you need and then use cursor to Assign to which members of the floor. (or assign to all)

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Post-Print Commands

• Support Reactions •Analysis Results • Member Forces • Max Force

ADD which property do you need and then use cursor to Assign to which members of the floor. (or assign to all)

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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 Code selections 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 analysis

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

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Visualization of Results

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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SHEAR FORCE DIAGRAM

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BENDING MOMENT DIAGRAM

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DEFLECTION ANIMATION

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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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STAAD OUTPUT

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

www.engr.mun.ca/~sabrah/Staad-Tut3.pdf

© Tamer Sabrah - 2006

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