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Problem Set 1

Consider the case where the displacement constraints at A and C are interchanged i.e.

• at A, only UX is set to zero
• at C, both UX and UY are set to zero

1. How would you expect the reaction forces at the supports A and C to change?

2. What can you say about how the x-component of the forces in the truss will change?

Re-solve the truss problem with the modified constraints. Fom your ANSYS solution:
1. List the reactions. Note that you can save the reaction listing as follows: in the window that comes up with the listing of the reaction forces, click on:

File > Save As

2. Determine the force in each truss member and whether the member is in tension or compression.

Tips: Start from your ANSYS solution to the truss tutorial problem but use a different job name as follows:

• Start the ANSYS Product Launcher. Specify the same directory as for the tutorial but use a different jobname. Once ANSYS comes up, select: Utility Menu > File > Resume from. Choose truss.db and click OK.

Note that you can delete constraints using:

Main Menu > Preprocessor > Loads > Define Loads > Delete

It works similar to how you apply loads.

You can plot the displacement constraints in the Graphics window as follows:

Utility Menu > Pltctrls > Symbols

Select All Applied BCs for Boundary condition symbol. Click OK.

You might have to use :

Utility Menu > Plot > Replot

or

Utility Menu > Plot > Multi-plots

for the constraint symbols to appear in your plot.
Go to Problem Set 2

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