Beam cross section property extraction

You can use beam cross section property extraction to define parameters on the Calculation Creation dialog box. Before you use beam cross section property extraction, you must define the beam cross sections in the FEM file. Then, when you use beam cross section property extraction to define a parameter, you select one of those properties. Rather than copying the value of the cross section property, the software creates a link between the cross section property and the parameter. Thus, if you change the physical dimensions of the beam cross section, the value for the cross section property that the software uses in the margin of safety calculation automatically reflects the changed cross section.

Note:

For solved margin of safety calculations, you must rerun the calculations in order for the results to reflect changes that you made to beam cross sections.

Beam cross section property extraction has the added advantages that it enables you to work more efficiently and helps you to avoid possible calculation and data transcription errors.

For information on how to define beam cross sections, see Creating beam cross sections.

As an example of using beam cross section property extraction, suppose that you are evaluating the margin of safety of a column against buckling and in the Calculation Method-Selection dialog box select Column Euler as the method. In the Calculation Creation dialog box, you must define two parameters that are cross section properties of a beam:

• **Area (A)**The area of the beam cross section

• **Bending Inertia (I)**The second moment of the beam cross section

To define the area, use the Beam Cross Section Property extraction option in the Property Extractor dialog box to select an active beam cross section. When you select a cross section, the Property Extractor dialog box displays a list of the section properties that have area as their dimensions. For detailed instructions on how to extract a property from a beam cross section, see Extract the area from a beam cross section.

If the active beam cross section is ROD(1) and you select Area from the list, after you click OK to close the Property Extractor dialog box, the following appears in the Area (A) box:

ExtractProperty("ROD(1)","BEAM_SECTION_PROP",{"AREA"})

This is a lookup function that the software automatically creates. This function defines the following arguments:

• ROD(1) identifies the active beam cross section.

• BEAM_SECTION_PROP identifies the extraction method.

• Area identifies the section property.

You can use the lookup function in the formula for a user-defined expression. For example, suppose that you want to calculate the margin of safety for the column using twice the cross section area. To do so, you can edit the text in the Area (A) box as follows:

2*ExtractProperty("ROD(1)","BEAM_SECTION_PROP",{"AREA"})

For information on using expressions, see Expressions.

Where do I find it?

Selecting a value for a parameter from the section properties of the active beam cross section

Application	Pre/Post
Prerequisites	An active margin of safety solutionA defined beam cross sectionA beam cross section selected from the Beam Section Manager dialog boxProperty Extractor dialog box open
Location in dialog box	Click Confirm source edit →Properties list

Changing the active beam cross section

Application	Pre/Post
Prerequisite	Property Extractor dialog box open
Location in dialog box	Click Select a Beam Section →Beam Section Manager dialog box→select a beam cross section→Close

How do I

Create a margin of safety calculation

Import values from a spreadsheet

Extract the area from a beam cross section

Extract a projected length

Create a margin of safety calculation using an allowable method

Bolt shear method example

Column Euler method example

Nodal force report extraction example

Learn more

Margin of safety calculations

Parent/child behavior in margin of safety calculations

Extracting a single value from the set of results (margin of safety)

Manual load extraction

Nodal force report extraction

Extracting shell element plane stress components relative to a common CSYS

Property extraction

Laminate extraction

Laminate property extraction

Sources manager (margin of safety)

Displaying result sources for margin of safety calculations

Look up more details

Methods for buckling of orthotropic laminates

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Beam cross section property extraction, Simcenter 3D 2021.1 Series

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