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New Fire resistance for steel in XFrame2D and XBeam2D

Eurocode · NL, BE, UK, DE, IT annexes · AISC 360-16 · ACI 318-19

Structural calculations
you can check,
line by line.

3D FEM, 2D frames, beams, a concrete and steel toolbox and parametric Excel models, to Eurocode. Every formula and clause is in the report, so you can recheck any number with a pocket calculator. Pay only for the hours you calculate.

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Free download · first hour free · €100 welcome credit when you register · then pay per use · no credit card · Windows

3D model of a large steel hall in XFEM4U
A model made with XFEM4U.
1Tasks

One prepaid credit works in every application, so you can start small.

Which program do I need?

What do you need to calculate?

Start from the job, not the product name. Four Windows applications and one Excel workbook, all a free download. Every application writes the same transparent report, straight into Word if you like.

2Facts

Facts you can check, not adjectives.

  • 1,000+Users
  • 9Countries
  • 5National annexes
  • 20+Releases per program
  • 7Software languages
  • €4,000Annual cap

Sources Release notes per program, November 2022 to August 2026. Price list October 2026. Users and countries: Struct4U, 2026.

3Transparency

The reference beam, an IPE 300 in S235 spanning 6 m, as it appears in the report.

Sample reports, in Dutch and English

No black box. Every formula, every clause, every value.

The report shows the formula as it appears in the code, the values that went in and the result with its unit. Your reviewer can follow it, and you can recheck it by hand.

XBeam2D · Beam B1 · IPE 300 · S235EN 1993-1-1 · p. 4

6.2.5Bending moment

EN 1993-1-1 §6.2.5
1Clause referenceEvery check names its article.

Cross-section class 1 (Table 5.2): the plastic resistance applies.

Wpl,y= 628.4 · 10³ mm³IPE 300
fy= 235 N/mm²S235, t ≤ 40 mm
γM0= 1.00§6.1(1), recommended
2Inputs with their sourceEvery value, its unit and origin.
Mc,Rd= Wpl,y · fy / γM0(6.13)
3The formulaAs printed, with its equation number.
= 628.4 · 10³ · 235 / 1.00 = 147.7 · 10⁶ Nmm
= 147.7 kNm
4Values filled inRe-key: 628.4 × 235 ÷ 1000 = 147.7
MEd= 81.0 kNmCO1 · 1.35 G + 1.5 Q (6.10)
UC= MEd / Mc,Rd = 81.0 / 147.7 = 0.55 ≤ 1.00 OK(6.12)
5Unity checkResult, limit and load combination.
Fig. 1Excerpt from an XBeam2D report: the bending check of beam B1. Illustrative recreation; the software writes every check in this structure.
43D analysis

ClauseGlobal sway imperfections to EN 1993-1-1 §5.3.2(3)a are applied automatically in both directions, so every ULS combination is calculated twice.

About XFEM4U

XFEM4U: 3D frames, plates and walls. Frames second-order, plates linear.

Steel, concrete and timber in one 3D model. With steel or timber checks switched on, frames are always analysed geometrically non-linear, with global imperfections applied automatically. Plates and walls are analysed linearly. Every member check is in the report, clause by clause.

Steel trusses and columns of a building in XFEM4U, coloured by displacement
Fig. 2Results in XFEM4U: the steel trusses and columns of a building, analysed geometrically non-linear for the ULS combination of wind and a 1/300 sway imperfection, coloured by displacement.
Specifications, in short
ElementsBeams and columns in steel, concrete and timber; plates, slabs and walls
AnalysisFrames: first order (GL) or second order (GNL), always GNL with steel or timber checks. Plates and walls: linear
CodesEN 1990 · 1991 · 1992-1-1 · 1993-1-1, -1-2, -1-8 · 1995-1-1 · AISC 360-16 · ACI 318-19 · NPR 9998
AnnexesNL · BE · UK · DE · IT
ExchangeIFC, Excel and XML; Tekla import, IDEA StatiCa export and DXF export with Premium
Price€15/h pay-per-use, or the Advanced licence at €2,218 a year
5Pricing

Break-even€1,770 ÷ €12 = 147.5 h
€2,218 ÷ €15 = 147.9 h
≈ 12 hours a month.

All prices excl. VAT. Price list October 2026.

Pay for the hours you calculate. Never more than €4,000 a year per computer.

Buy prepaid credit, billed per minute: €12/h for the 2D programs, €15/h for XFEM4U. Registering gives you €100 of credit as a welcome gift, and because you pay in advance, there’s never an invoice afterwards.

8h/month · 96 h/year
Pay-per-use
€1,152/year
Basic 2D licence
€1,770/year

Pay-per-use is cheaper by €618 a year. Break-even is at about 12.3 hours a month.

€0€1,000€2,000€3,000€4,00005101520253035Cap: €4,000 per computer per yearBasic 2D €1,770≈ 12.3 h
Licences, per year
LicenceBasic
2D		Advanced
2D + 3D		Premium
Single usermax. 2 workstations€1,770€2,218€2,688
Networkper simultaneous user€2,632€3,293€3,696
Pay-per-use€12/h 2D · €15/h XFEM4U · billed per minute · capped at €4,000 per computer per year, all programs · top-ups from €350
Welcome€100 of pay-per-use credit when you register in the program: about 8 h of 2D or 6½ h of XFEM4U
2D and 3DBasic 2D covers XBeam2D, XFrame2D, XConstruct and XSpreadsheets. Advanced adds XFEM4U. Premium adds DXF export, Tekla import, IDEA StatiCa export and Python
StudentsFree one-year licence with a university e-mail address (watermarked, non-commercial)
AI AssistantIncluded with every account, about 100 questions a month · more questions from €9/month · Pro €29/month
Download freeFull pricing
6Report

RequiresWord for Windows (desktop). The add-in installs with each program.

Word add-in

Your calculation in your Word report. Always current.

The Word add-in puts the report of any Struct4U application into your own Word document as a linked block. Change the model and Word marks the block out of date; one click updates it. No screenshots, no retyping.

  1. 1

    Drop the model

    Drag an XFEM4U, XFrame2D, XBeam2D or XConstruct model onto the Calculations pane. The report goes in at the cursor as a linked block.

  2. 2

    Change the model

    Each block keeps a fingerprint of its model. When the model changes, the block is marked out of date.

  3. 3

    Update

    Update recalculates the block in place; Update all does every out-of-date block. Nothing is ever refreshed silently.

Word add-in demo: calculation reports, straight into Word Watch the demo0:51
Fig. 3Word add-in demo (English). It loads and plays only when you click.
Report-B1.docx

4.2 Steel floor beam B1

Checked to EN 1993-1-1. The results below are linked to the model.

Linked · beam-B1.xbe2 · XBeam2D✓ Up to date
BeamIPE 300 · S235 · 6.00 m
Bending §6.2.5UC 0.55
Shear §6.2.6UC 0.15
Deflection L/250UC 0.50
Fig. 4A linked block in Word, recreated. When the model changes, the block is marked out of date until you click Update.
7Verification

The sample reports print the applied standards with their edition and national annex, and the consequence class.

Don’t take our word for it. Check the report.

Struct4U reports are written to be rechecked. A reviewer can follow every step without opening the model, and you can re-key any number.

  1. Standards named

    Each report names the codes it applied, with edition, national annex and consequence class.

  2. Inputs with their source

    Section properties, material strengths and partial factors, each with its unit.

  3. Formula, then values

    Every check prints the formula with its equation number, fills in the values and gives the result.

  4. Unity check per member

    A table lists each member with its combination, the article and the unity check.

Sample reportsExamples and sample reports Real reports from XFEM4U, XFrame2D, XBeam2D and XConstruct, in Dutch and English.VerificationVerification Where Struct4U publishes its verification cases: hand calculations and textbook solutions, each with the deviation stated.
8Customers

The highlights are ours.

Engineers who use it. In their own words.

  • As an (independent) small consulting firm, I have been using Struct4U software since 2018. It is very user friendly software, both input and changes a very fine visual display. Experienced the ongoing development of this software in recent years and a lot of custom requests have been incorporated. The intermediate design output works very easily, is clear and you can see fairly quickly what part needs modifications. The final output is very complete and gives full printouts of all formulas. A very good quality-price ratio; I myself have a complete year package and with that you have a comprehensive software package. I can recommend it to everyone.

    Ing. Ruud van der BreggenBouwadvies Van der Breggen B.V.

  • As a small consulting firm, we were looking for an affordable option for simple and more complex FEM calculations and ended up with Struct4U. Both the fee system (per hour when used) but also the software really appealed to us. Due to the extremely high (intuitive) ease of use during input and the good output capabilities, both for the FEM software and the material toolboxes, all packages score highly with us. With an alert, knowledgeable and responsive support, it is a strong tool for the structural engineer.

    ir. F.D.H. SchleipfenbauerIngenieursbureau Middelhuis en Schleipfenbauer

  • From the start of Ingenieursbureau Van Wijngaarden in 2018, I have been working with Struct4U software. The calculation software has evolved considerably from this period and is pleasant to work with. The helpdesk is easily accessible, responds quickly and listens carefully to the customer’s needs.

    ing. J.C. van WijngaardenIngenieursbureau Van Wijngaarden

An independent Dutch company, since 2014. Struct4U is based in Rotterdam. The programmers and structural engineers who build the software also answer your questions.

9FAQ

More answers

Questions engineers ask first.

9.1What does 5 hours a month cost?
With pay-per-use, 5 hours a month in the 2D programs costs €60 a month, or €720 a year. In XFEM4U it’s €75 a month, or €900 a year. You’re billed per minute from prepaid credit, never more than €4,000 per computer per year, and the first €100 is a welcome gift when you register. A Basic 2D licence costs €1,770 a year, so at 5 hours a month pay-per-use is cheaper. All prices excl. VAT.
9.2Which codes and national annexes are covered?
Eurocodes for steel, concrete and timber with the national annexes of the Netherlands, Belgium, the United Kingdom, Germany and Italy, plus ANSI/AISC 360-16 for steel and ANSI/ACI 318-19 for concrete. XConstruct follows the Dutch annex only. The design codes page has the overview per program.
9.3Can my reviewer follow the output?
Yes. The report names the standards and national annex it applied, prints each formula with its clause, fills in the values and gives the unity check. A reviewer can follow every step, and you can recheck any number by hand. Have a look at the sample reports.
9.4Is it Windows only?
Yes. The four applications run on 64-bit Windows; there’s no Mac or browser version. XSpreadsheets runs in Excel and builds models for XFrame2D and XFEM4U, and the Word add-in needs Word for Windows (desktop). There’s no dongle.
9.5Is it free for students?
Yes. Students get a free licence for one year with an e-mail address from a university or college that Struct4U recognises; otherwise, write to education@struct4u.com. Output carries a watermark, and commercial use isn’t allowed. More on the student licence page.

Try it on your next calculation.

Download free and calculate for an hour straight away. Register in the program for €100 of welcome credit. After that, top up or buy a licence.

Free download · first hour free · €100 welcome credit when you register · then pay per use · no credit card · Windows

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