User Guide

RISA-3D User’s Guide

Version 5.0

Release the mouse button and the entire truss, and nothing else, should be

selected.

Now click the Move button on the Drawing Toolbar (it has a blue arrow)

and a dialog appears. We only want to change the elevation so double-click in the

field labeled Y and type “4.25”.

Now click Apply.

If we wanted to make the changes within the spreadsheets we could have used the

block math feature to accomplish both modifications. To widen the structure we

simply would have multiplied the joint X coordinates by “1.25”. To raise the

truss we would have first sorted the Y coordinates and then selected the

coordinates that are at an elevation of 8.5ft or higher. The final step would be to

use the Math feature to add “4.25” to these selected Y coordinates.

Select the entire model by clicking on Select All . Also click on the

Isometric button and then the Full View button.

Design Parameters

Before solving the model, steel and timber design code parameters such as

unbraced length must be specified. We will assign these values graphically. To

view the parameters for any one member you can also double-click that member.

The Member Design Parameters spreadsheet is where the values are recorded.

Select Design Parameters from the Modify menu. Type “Segment” (or “Seg”)

in the “Lbyy/le2/Luyy” field and check the Use checkbox. Also select Apply

Entries to All Selected Members as shown here: