[{"data":1,"prerenderedAt":246},["ShallowReactive",2],{"copy:verification-reviewers:en":3,"copy:reports:en":132,"copy:codes:en":185},{"seo":4,"hero":7,"block":13,"print":20,"id":21,"history":37,"methods":50,"clauses":78,"annexes":90,"limits":95,"verify":107,"gaps":114,"contact":125},{"title":5,"description":6},"Reviewer dossier: Struct4U for building control","For reviewers of a Struct4U calculation: version history, analysis methods, clauses and annexes covered, known limitations, how to verify, and a contact.",{"label":8,"title":9,"lead":10,"crumbs":11,"verification":12},"Reviewer dossier","Dossier for reviewers","For building-control officers and checking engineers who meet Struct4U in a calculation package. Everything below comes from the release notes, the manuals and the published sample reports. Where something is not documented yet, we say so.","Breadcrumb","Verification",{"subject":14,"subjectValue":15,"maker":16,"status":17,"sources":18,"sourcesValue":19},"Subject","XFEM4U, XFrame2D, XBeam2D, XConstruct","Maker","Status","Sources","Release notes, manuals, sample reports","Print or save as PDF",{"label":22,"title":23,"rows":24,"values":31},"Identification","Program and maker",{"maker":16,"programs":25,"spreadsheets":26,"platform":27,"output":28,"header":29,"languages":30},"Programs and current version","XSpreadsheets","Platform","Report output","Version on the report","Program languages",{"spreadsheets":32,"platform":33,"output":34,"header":35,"languages":36},"An Excel workbook that builds XFrame2D and XFEM4U models. The calculation and the checks run in those programs.","Windows, 64-bit. On .NET 10 since XConstruct {xconstruct} and XFEM4U, XFrame2D and XBeam2D {apps}.","PDF and RTF; Microsoft Word (.docx) since the releases of 24 August 2025, with the formulas as Word equations.","Each report page prints the program and version and the date and time of the calculation, for example “XBeam2D 2023.1.01” and “12-11-2022 - 17:30”.","{list}.",{"label":38,"title":39,"lead":40,"head":41,"numbering":48,"cta":49},"Versions","Version history","From the release notes of each program, which go back to November 2022.",{"program":42,"releases":43,"first":44,"latest":45,"calc":46,"notes":47},"Program","Releases","First in the notes","Latest","With Δ since Aug 2025","Release notes","Version numbers run ahead of the calendar: XFEM4U {version} came out on {date}. The release notes list each change, often with the help-desk number behind it. Δ counts releases whose notes describe a change that can alter the results of an unchanged model.","Changelog with every calculation change",{"label":51,"title":52,"lead":53,"apps":54,"matrixTitle":76,"notDocumented":77},"Methods","Methods and analysis types","As described in the manuals and the release notes.",{"xfem4u":55,"xframe2d":62,"xbeam2d":67,"xconstruct":72},[56,57,58,59,60,61],"3D frames of beam elements, analysed first-order (geometrically linear) or second-order (geometrically non-linear). With a Eurocode steel or timber check switched on, the analysis is always second-order.","Global sway imperfections to EN 1993-1-1, 5.3.2(3)a are applied automatically in +dx and −dx, so every ULS combination is calculated twice. Member imperfections (5.3.2(3)b) are not modelled; members are checked to 6.3 with the buckling length equal to the member length (5.2.2(7)b).","Plates, slabs and walls with automatic meshing, analysed first-order only.","ANSI\u002FAISC 360-16: the Direct Analysis Method (Section C1.1, LRFD) on a second-order analysis with initial imperfections.","Earthquake (NL): response spectrum to NPR 9998, with natural frequencies by the Rayleigh method and seismic load cases in x and y.","Beams on an elastic foundation and tension-only or compression-only members are solved iteratively in the load combinations.",[63,64,65,66],"2D frames, first-order or second-order. With a Eurocode check switched on, always second-order with imperfections; global tilt is applied in two directions.","Member imperfections are not modelled; members are checked with the buckling length equal to the member length.","Beams on an elastic foundation and tension-only or compression-only members are solved iteratively in the load combinations only, from version 2027-05-01.","Up to {nodes} nodes, {beams} members, {cases} load cases and {combinations} combinations, with {perCombination} load cases per combination. Node joints are linear springs.",[68,69,70,71],"Beams on supports and elastic beds, analysed geometrically linear.","Concrete deflection from the M-N-κ diagram (physically non-linear), and long-term deflection with creep for concrete and timber.","Chessboard (pattern) loading of variable loads, with the load cases and combinations generated, from version 2027-03-01.","Concrete deflections are not calculated for beams on an elastic foundation or on springs.",[73,74,75],"Section and detail checks for the forces you enter: steel connections and column bases, concrete sections with the M-N-κ diagram, concrete columns, punching, timber members, masonry and pile bearing capacity.","NEN-EN editions with the Dutch national annex only.","Many calculations in one project file, recalculated on every change.","Analysis types per program","Not offered: modal or dynamic analysis beyond the Rayleigh frequencies used for NPR 9998, linear buckling (eigenvalue) analysis, physically non-linear analysis in 3D, construction stages and moving loads.",{"label":79,"title":80,"lead":81,"notesTitle":82,"notesItems":83,"open":89},"Clauses","Clauses printed in the sample reports","Clauses, tables and equation numbers that the published sample reports print next to their checks (version 2023.1, November 2022).","Clauses named in the release notes since August 2025",[84,85,86,87,88],"EN 1993-1-1, 6.3.2.3, Table 6.6: correction factor kc by Serna et al. (XFEM4U 2027-04-01; XFrame2D and XBeam2D 2027-03-01).","NEN-EN 1993-1-1 NB, Figure NB.6, formula NB.7 and NB.NB.2: C2 in the critical moment for lateral-torsional buckling (XFEM4U 2027-01-01; XFrame2D, XBeam2D and XConstruct 2027-03-01).","NEN-EN 1993-1-1, Table B.3: factor Cmy for the steel column (XConstruct 2026-07-01).","NEN-EN 1992-1-1, 10.9.4.3(8): mortar joints of concrete columns (XConstruct 2026-07-01).","NEN 9997-1:2025+C1:2025, Table 7.c: pile factors (XConstruct 2027-03-01).","PDF",{"label":91,"title":92,"lead":93,"codesTitle":94},"Coverage","Annex and code coverage","✓ documented, ✗ not included, “ask us” not documented yet.","Codes per program",{"label":96,"title":97,"items":98},"Limitations","Known limitations",[99,100,101,102,103,104,105,106],"XFEM4U analyses frames second-order; plates and walls are analysed first-order only.","Member imperfections are not modelled (see Methods).","XBeam2D is geometrically linear and does not calculate concrete deflections for beams on an elastic foundation or on springs.","XConstruct uses the Dutch national annex only.","XFrame2D and XBeam2D: up to {nodes} nodes and {beams} members; node joints are linear springs.","The XFrame2D timber sample report states that snow loads for multi-span roofs (EN 1991-1-3, 5.3.4, Figure 5.4) are not taken into account.","The programs run on 64-bit Windows only; the Word add-in needs Word for Windows (desktop).","The published sample reports date from November 2022 (version 2023.1).",{"label":108,"title":109,"text":110,"steps":111,"problem":112,"reports":113},"Verify","How to verify a result","Each check prints its clause, the formula, the values filled in and the result against its limit, so a result can be rechecked by hand. The verification page shows a transcribed report page and the steps.","How to recheck a result","Report a result problem","Sample reports",{"label":115,"title":116,"lead":117,"items":118},"Not yet documented","Not yet in this dossier","These are not documented publicly yet. Ask us about them for your project.",[119,120,121,122,123,124],"The test procedure every release goes through before it ships.","Certification status, for example KOMO BRL 0207 or ISO 9001.","A complete list of the clauses each program implements.","The formulation of the beam and plate elements, with literature references.","Verification cases that compare program results with hand calculations or benchmarks.","A named contact person for reviewer questions.",{"label":126,"title":127,"email":128,"phone":129,"company":130,"note":131},"Contact","Contact for reviewer questions","E-mail","Phone","Company","Mention the project, the program and version, and the check you are asking about.",{"jobs":133,"materials":170,"langs":174,"annex":178,"pages":182,"page":183,"files":184},{"xfem4u-steel-hall-eurocode":134,"xfem4u-steel-hall-aisc":138,"xframe2d-timber-roof-frame":142,"xbeam2d-concrete-beam":146,"xconstruct-moment-connection":150,"xconstruct-column-base":154,"xconstruct-concrete-section":158,"xconstruct-concrete-column":162,"xconstruct-punching-shear":166},{"title":135,"summary":136,"thumbAlt":137},"Steel hall in 3D, to Eurocode","A steel hall with dead, imposed, snow and two wind load cases. Second-order analysis with imperfections (EN 1993-1-1, 5.3.2) and unity checks per member to clauses 6.2 and 6.3, with the Dutch annex. The report is in Dutch.","Page 2 of the report: the 3D model of the hall, members coloured by profile.",{"title":139,"summary":140,"thumbAlt":141},"The same hall, to ANSI\u002FAISC 360-16","The steel hall checked to AISC 360-16 with the Direct Analysis Method (Section C1.1, LRFD) on a second-order analysis with initial imperfections, member by member to chapters D to H.","Page 52 of the English report: flexural buckling check E3 of beam 30, an IPE 300, with the values filled in.",{"title":143,"summary":144,"thumbAlt":145},"Timber roof frame","A timber roof frame (C18, 38 × 235 mm) with snow and wind loads generated to EN 1991. Second-order analysis with imperfections (EN 1995-1-1, 5.4.4) and member checks to EN 1995-1-1. The English report uses the German annex, the Dutch one the Dutch annex.","Page 20 of the English report: envelope moment and shear force diagrams of the roof frame.",{"title":147,"summary":148,"thumbAlt":149},"Reinforced concrete beam","A 1000 × 260 mm slab strip in C20\u002F25 over three supports, with spans of 2.0 and 6.2 m and a 2.0 m cantilever: ULS and SLS envelopes, longitudinal and shear reinforcement, and crack control without direct calculation.","Page 7 of the English report: the longitudinal reinforcement table and the shifted moment line.",{"title":151,"summary":152,"thumbAlt":153},"Bolted end-plate moment connection","An IPE 240 beam connected to an HEB 160 column with 8 M16 bolts, grade 8.8, in S235: resistance per component and bolt row, rotational stiffness and classification (semi-rigid) to NEN-EN 1993-1-8.","Page 1 of the English report: elevation and section of the connection with the bolt layout.",{"title":155,"summary":156,"thumbAlt":157},"Steel column base","An HEB 300 on a 380 × 460 × 25 mm base plate with M24 anchors in C25\u002F30, for N = 300 kN, V = 20 kN and M = 25 kNm: concrete bearing, anchors, welds and rotational stiffness to NEN-EN 1993-1-8.","Page 1 of the English report: elevation and plan of the column base with loads and dimensions.",{"title":159,"summary":160,"thumbAlt":161},"Concrete section with M-N-κ diagram","A 500 × 700 mm beam section in C20\u002F25 with 5 Ø16 top and bottom: bending, shear and torsion to NEN-EN 1992-1-1, with the M-N-κ diagram and the bending stiffness it gives.","Page 3 of the English report: the M-N-κ diagram in the ultimate limit state.",{"title":163,"summary":164,"thumbAlt":165},"Circular concrete column, with fire","A column of 450 mm diameter in C45\u002F55, 3.5 m long: second-order effects (NEN-EN 1992-1-1, 5.8), biaxial bending, fire resistance R60 by the 500 °C isotherm method (NEN-EN 1992-1-2) and the mortar joint at the base.","Page 3 of the English report: sectional calculation of the circular column with the forces in steel and concrete.",{"title":167,"summary":168,"thumbAlt":169},"Punching shear","A 240 mm slab on a circular column with an enlarged head, 275 kN with eccentricity, in C30\u002F37: punching to NEN-EN 1992-1-1, 6.4.3. Result: no punching reinforcement needed.","Page 1 of the English report: section and plan of the slab and column head with the control perimeter.",{"steel":171,"concrete":172,"timber":173},"Steel","Concrete","Timber",{"en":175,"nl":176,"es":177},"English","Dutch","Spanish",{"NL":179,"DE":180,"US":181},"Dutch annex","German annex","","{n} pp","p. {n}","Report files",{"groups":186,"codes":191,"marks":207,"legend":211,"matrixCaption":215,"headCode":216,"sourcesTitle":217,"src":218,"annexCaption":225,"annexProgram":42,"annexNames":226,"analysis":234,"analysisCaption":76},{"basis":187,"concrete":172,"steel":171,"timber":173,"masonry":188,"geo":189,"nl":190},"Basis and actions","Masonry","Geotechnics","Dutch rules",{"en1990":192,"en1991":193,"en1992-1-1":194,"en1992-1-2":195,"en1993-1-1":196,"en1993-1-2":197,"en1993-1-8":198,"aisc360":199,"aci318":200,"en1995-1-1":201,"en1996-1-1":202,"npr9096":203,"en1997-1":204,"nen8700":205,"npr9998":206},"Basis of design, load combinations","Snow and wind loads, generated","Concrete: general rules and buildings","Concrete: fire design","Steel: general rules and buildings","Steel: fire design","Steel: joints","US steel specification, direct analysis method","US concrete code","Timber: general rules and buildings","Masonry: general rules","Masonry, Dutch simplified rules: cavity wall under wind","Geotechnics: pile bearing capacity from CPTs","Existing structures: partial factors of Table A.1.2","Induced earthquakes in the Netherlands: response spectrum",{"yes":208,"no":209,"ask":210},"Covered","Not covered","ask us",{"yes":212,"no":213,"ask":214},"covered","not covered","not documented yet, so we do not claim it","Design codes per program","Code","Where each mark comes from",{"report":219,"manual":220,"notes":221,"site":222,"kb":223,"owner":224},"sample report (Nov 2022)","manual","release notes {version} ({date})","struct4u.com","former Struct4U knowledge centre","confirmed by Struct4U (Sep 2026)","National annexes per program",{"NL":227,"BE":228,"UK":229,"DE":230,"IT":231,"ES":232,"PT":233},"Netherlands","Belgium","United Kingdom","Germany","Italy","Spain","Portugal",{"gl":235,"gnl":236,"plates":237,"platesGnl":238,"mnk":239,"elasticFoundation":240,"tensionOnly":241,"earthquake":242,"ponding":243,"chessboard":244,"fire":245},"First-order (geometrically linear) analysis","Second-order (geometrically non-linear) analysis with global imperfections","Plates, slabs and walls","Second-order effects in plates and walls","Concrete stiffness from the M-N-κ diagram (physically non-linear)","Beams on an elastic foundation","Tension-only and compression-only members","Response spectrum to NPR 9998","Water accumulation (ponding)","Chessboard (pattern) loading","Fire resistance of steel members",1792702119793]