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FERMA

Steel roof truss design for AutoCAD

Sketch the roof plan, pick a truss type and set the loads. FERMA analyzes the truss, selects hollow sections, checks the welded joints, and draws the shop sheets with the parts list.

FERMAFERMAAGAIN
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AutoCAD 2013 or newer, or AutoCAD LT 2024 or newer. After payment you get your license key and the download link by email.

All four programs: Complete, $199. See pricing

Roof-F1.dwg [Model]
24000 Top chord 120×80×5Bottom chord 100×60×4Webs 50×50×3 Truss F-1 Elevation, 1:50 Parts list of one truss PosSectionLengthQty 1SHS/RHS 120×80×51235022RHS 100×60×41200013SHS 50×50×388094Plate 10, end1602 Chords Webs
Command: FERMA
Schematic illustration.

Sample FERMA drawings

Two sheets drawn by FERMA, labelled in English. The program writes the labels on the drawings in the language you choose.

FERMA drawing: elevation of a 26 m trapezoidal Pratt steel truss with member forces, joint numbers and dimensions
Truss elevation with member forces. Trapezoidal Pratt truss: span 26.00 m, 12 panels of 2167 mm, steel S355. Every member shows its ULS design force in kN (+ tension, − compression), every member group its hollow section, and the joints are numbered. The truss is made in two shipping pieces; the central vertical is bolted on site.
FERMA joint details sheet: truss supports with anchor bolts, welded truss joints, a bolted site splice and chord splices
Joint details. Truss supports on concrete with base plates and anchor bolts, welded joints of the chords and diagonals, the bolted end-plate site splice and the shop splices of the chords. Each detail carries the joint number used on the elevation.

What FERMA does

Designs the truss

Two-dimensional analysis by the stiffness method. It selects square and rectangular hollow sections, checks the welded joints and the deflection, and handles continuous trusses over intermediate supports.

Prepares fabrication

Trusses shipped in one or two pieces with bolted end-plate splices. Purlins in UPN or hollow sections on angle cleats. Weld sizes, bolts and anchors in the parts list.

Draws the sheets

Plot-ready sheets with frame and title block: elevation, roof plan with bracing, purlin layout, results and parts list, and node details at 1:10.

FERMA is a preliminary design tool. A licensed engineer must check the results before they are used.

Details

Design codes
EN 1993 with EN 1990 combinationsAISC 360-22 LRFDAISC 360-22 ASD
Hollow section standards
EN 10219GOST 30245ASTM A500ASTM A1085CSA G40AS/NZS 1163IS 4923GB/T 6728JIS G 3466
Truss types
Seven truss types, picked from sketches. Web patterns: Pratt, Howe, Warren, and Warren with verticals.
Loads
Dead load, snow (symmetric and asymmetric), wind uplift and wind pressure normal to the roof, and the roof imposed load.
Starting point
Select a sketch of the roof plan in your drawing: lines are trusses, small marks are supports. FERMA reads the number of trusses, the spacing and the spans.
Interface languages
ქართულიEnglishРусскийTürkçeEspañolDeutschFrançaisItalianoPortuguêsPolskiУкраїнськаAzərbaycanca
Units
Metric, or feet, psf and kip with feet-and-inches on the drawings. Sheets A3, A2, A1 or ANSI, scale chosen automatically.
Files
Projects as .fma files. Parts list as CSV or Excel. Your settings are remembered.
Commands
FERMAFERMAAGAINFERMASAVEFERMAOPENFERMANEWFERMAINFOFERMATESTFERMAKEY
Requirements
AutoCAD 2013 or newer, or AutoCAD LT 2024 or newer.

Work in concrete too?

Complete gives you FERMA and the three reinforced concrete programs for $199 instead of $256.

Buy Complete All programs