The truss designer

Transcript

The truss designer.

Start

Three types design a whole truss: wood, steel and cold-formed steel. They work the same way. In the wizard, the truss spreads over pages, starting with the layout, by picture, with the design beside it.

The inputs

Here is a Fink roof truss, in Douglas Fir-Larch, number 1. The span is 28 feet, at a pitch of 5 in 12, with trusses at 2 feet. The loads are 10 pounds per square foot top chord dead, 20 roof live, and 7 bottom chord dead, with no wind. Size the members automatically is on.

The results and the label

All three truss types carry a label on the screen, the report and the sheet: Preview, not yet verified, do not rely on these results. It is there because no published complete truss example is on file. So treat a result as a starting point. Here, automatic sizing chose a 2x4 top chord, a 2x6 bottom chord, and 2x4 webs.

The check that governs

Member marks match the elevation and the schedule. The bottom chord governs, at 0.771: 1,083 pounds per square inch against 1,405, with a person load on an unsheathed chord panel. That is an input you can review.

What it does not do

Connections are not designed: no plates, gussets, screws or heels. The braces themselves are your design. Check the result by hand, or with your truss supplier's design.

Report and sheet

Then print the report, with every check, its equations and its clauses. Print the drawing sheet on your own title block, at the size you choose, or export it as a DXF. Both carry the preview label.

Questions? Select Support in the app, or write to us at services@ilxstudio.com.