# \#addon-steel-design **URL:** https://community.dlubal.com/tag/addon-steel-design/46.md [Latest](https://community.dlubal.com/latest.md) · [Categories](https://community.dlubal.com/categories.md) · [Tags](https://community.dlubal.com/tags.md) --- ## [Imperfections Source Automaticaly](https://community.dlubal.com/t/imperfections-source-automaticaly/5069)
**Author:** [@dbesed](https://community.dlubal.com/u/dbesed)\ **Replies:** 8\ **Last updated:** [October 20, 2026, 6:33am UTC](https://community.dlubal.com/t/imperfections-source-automaticaly/5069 "2026-10-20T06:33:31Z")
When I use automatically determined imperfections from buckling modes, is there a table showing the imperfection amplitudes that RFEM automatically determines and that I can inspect? I can't seem to find this informat… --- ## [4LLI laced box – t\*, lacing weight, buckling](https://community.dlubal.com/t/4lli-laced-box-t-lacing-weight-buckling/5388)
**Author:** [@waelnoaman](https://community.dlubal.com/u/waelnoaman)\ **Replies:** 1\ **Last updated:** [October 16, 2026, 5:20am UTC](https://community.dlubal.com/t/4lli-laced-box-t-lacing-weight-buckling/5388 "2026-10-16T05:20:01Z")
Hello, In RFEM 6.12 I model lattice tower legs as "4 Angles with Legs Inward" (e.g. 4LLI L 100x100x10 /250/1). The 4 angles are connected by single lacing on all 4 faces (see screenshot). How should I calculate t\* … --- ## [Formula assignment for lateral-torsional buckling in steel design](https://community.dlubal.com/t/formelzuordnung-biegedrillknicken-stahlbemessung/5326)
**Author:** [@Robert](https://community.dlubal.com/u/Robert)\ **Replies:** 1\ **Last updated:** [October 8, 2026, 7:37am UTC](https://community.dlubal.com/t/formelzuordnung-biegedrillknicken-stahlbemessung/5326 "2026-10-08T07:37:27Z")
Hello everyone, I may be mistaken, or there may be a newer standard by now, but the verification formula for lateral-torsional buckling according to 6.3.2.1 is listed as Equation 6.55, paragraph (3), for eta. It should actually be … --- ## [Enable "Method 2" for kyy, kyz](https://community.dlubal.com/t/activer-les-parametres-de-la-methode-2-pour-kyy-kyz/4267)
**Author:** [@amazigh](https://community.dlubal.com/u/amazigh)\ **Replies:** 1\ **Last updated:** [September 3, 2026, 8:05am UTC](https://community.dlubal.com/t/activer-les-parametres-de-la-methode-2-pour-kyy-kyz/4267 "2026-09-03T08:05:48Z")
Hello, I would like to know how I can activate method 2 (annex B of EC3) to calculate kyy, kyz, ... Do you have a line of code I can use? Have a good day, --- ## [Enable settings for double bending via the API](https://community.dlubal.com/t/activer-les-parametres-pour-la-double-flexion-via-lapi/4266)
**Author:** [@amazigh](https://community.dlubal.com/u/amazigh)\ **Replies:** 3\ **Last updated:** [September 3, 2026, 7:59am UTC](https://community.dlubal.com/t/activer-les-parametres-pour-la-double-flexion-via-lapi/4266 "2026-09-03T07:59:30Z")
Hello, I would like to activate the double bending as shown in the image below but with Python (via the API). What is the line of code, please? Have a good day, --- ## [Error message: Unstable model](https://community.dlubal.com/t/fehlermeldung-instabiles-modell/4121)
**Author:** [@emgo\_fh](https://community.dlubal.com/u/emgo_fh)\ **Replies:** 2\ **Last updated:** [August 25, 2026, 1:09pm UTC](https://community.dlubal.com/t/fehlermeldung-instabiles-modell/4121 "2026-08-25T13:09:06Z")
We are completely new to using RSTAB and have a problem with our modeling. According to the error message, our model is unstable at a node and we don't know how to fix this problem. Many thanks… --- ## [🛠️ Steel design in the serviceability limit state](https://community.dlubal.com/t/stahlbemessung-im-grenzzustand-der-gebrauchstauglichkeit/4036)
**Author:** [@carina.zinnbauer](https://community.dlubal.com/u/carina.zinnbauer)\ **Replies:** 0\ **Last updated:** [August 24, 2026, 1:30pm UTC](https://community.dlubal.com/t/stahlbemessung-im-grenzzustand-der-gebrauchstauglichkeit/4036 "2026-08-24T13:30:36Z")
:right\_arrow: Gain insights. Deepen your knowledge. Connect. Join our webinar on steel design for serviceability limit states—presented by experts and built for practical application. Webinar highlights … --- ## [🛠️ Steel Design at the Serviceability Limit State](https://community.dlubal.com/t/steel-design-at-the-serviceability-limit-state/4037)
**Author:** [@carina.zinnbauer](https://community.dlubal.com/u/carina.zinnbauer)\ **Replies:** 0\ **Last updated:** [August 24, 2026, 1:30pm UTC](https://community.dlubal.com/t/steel-design-at-the-serviceability-limit-state/4037 "2026-08-24T13:30:36Z")
:right\_arrow: Gain practical insights. Enhance your skills. Connect. Join our webinar Steel Design at the Serviceability Limit State – presented by experts, made for practice. Webinar Highlights :white\_check\_mark: N… --- ## [Steel Design According to Second-Order Theory](https://community.dlubal.com/t/stahlbemessung-nach-theorie-ii-ordnung/4115)
**Author:** [@JanHendrik](https://community.dlubal.com/u/JanHendrik)\ **Replies:** 1\ **Last updated:** [August 19, 2026, 9:25am UTC](https://community.dlubal.com/t/stahlbemessung-nach-theorie-ii-ordnung/4115 "2026-08-19T09:25:06Z")
Hello, I have the following problem: I need to dimension a steel hall for an academic assignment. For this, we are supposed to select standard cross-sections that are at least 80% utilized. When I choose large cross-sections, ... --- ## [Cross section optimization](https://community.dlubal.com/t/cross-section-optimization/3998)
**Author:** [@waelnoaman](https://community.dlubal.com/u/waelnoaman)\ **Replies:** 7\ **Last updated:** [August 19, 2026, 9:21am UTC](https://community.dlubal.com/t/cross-section-optimization/3998 "2026-08-19T09:21:24Z")
Hello, I'm having a problem with cross-section optimization in RFEM 6 using the Steel Design add-on. As you can see in the screenshot, the utilization ratio was 0.768 before optimization. After running the optimization… --- ## [Missing analysis results for surfaces](https://community.dlubal.com/t/missing-analysis-results-for-surfaces/4005)
**Author:** [@waelnoaman](https://community.dlubal.com/u/waelnoaman)\ **Replies:** 4\ **Last updated:** [August 3, 2026, 2:19pm UTC](https://community.dlubal.com/t/missing-analysis-results-for-surfaces/4005 "2026-08-03T14:19:38Z")
Hello, I have this problem in steel design addon. some surfaces are not analyzed as you see in the photo. I dont know why this is weird. is there a way to refresh these colours. I think this is a bug, as it was worki… --- ## [Modification of the XLT coefficient in RFEM 6 (steel design)](https://community.dlubal.com/t/modifizierung-des-beiwertes-xlt-bei-stahlbemessung/3443)
**Author:** [@Natsu](https://community.dlubal.com/u/Natsu)\ **Replies:** 5\ **Last updated:** [May 27, 2026, 9:24am UTC](https://community.dlubal.com/t/modifizierung-des-beiwertes-xlt-bei-stahlbemessung/3443 "2026-05-27T09:24:27Z")
Hi. Today I noticed that in the stability analysis in steel design in RFEM 6 (6.14.0002), despite the checkmark for modifying XLT (Chi LT) by the factor F, it does not change in the design because the factor kc … --- ## [Unique Global and Local Initial Imperfection](https://community.dlubal.com/t/unique-global-and-local-initial-imperfection/3483)
**Author:** [@dbesed](https://community.dlubal.com/u/dbesed)\ **Replies:** 3\ **Last updated:** [May 12, 2026, 9:05am UTC](https://community.dlubal.com/t/unique-global-and-local-initial-imperfection/3483 "2026-05-12T09:05:06Z")
Hi, I would like to implement the imperfections in accordance with 5.3.2(11), Unique Global and Local Initial Imperfection. For this, I would need the internal forces caused in the structure by imposed deformations cor… --- ## [Design of a steel connection in RFEM 6](https://community.dlubal.com/t/bemessung-eines-stahlanschlusses/3461)
**Author:** [@Mzabi2025](https://community.dlubal.com/u/Mzabi2025)\ **Replies:** 1\ **Last updated:** [May 7, 2026, 4:43am UTC](https://community.dlubal.com/t/bemessung-eines-stahlanschlusses/3461 "2026-05-07T04:43:04Z")
Dear Dlubal Support Team, I currently have a problem with the design of a steel connection in RFEM6. The following error appears: "ER9003 – Error | Design situation type for stress-strain calculation…" --- ## [Welds of type tee-joint\_bevel on welded cross-section profiles](https://community.dlubal.com/t/welds-of-type-tee-joint-bevel-on-welded-cross-section-profiles/3316)
**Author:** [@joao.vaz\_jvStruct](https://community.dlubal.com/u/joao.vaz_jvStruct)\ **Replies:** 3\ **Last updated:** [April 29, 2026, 8:13am UTC](https://community.dlubal.com/t/welds-of-type-tee-joint-bevel-on-welded-cross-section-profiles/3316 "2026-04-29T08:13:23Z")
Dear community, Would be nice a new feature to be able to verify welds of type tee-joint\_bevel on some types of welded cross-section, and also add the checks of this verifications on the profile welds steel design accor… --- ## [Determination of alpha\_cr for M\_cr in Steel Design add-on](https://community.dlubal.com/t/determination-of-alpha-cr-for-m-cr-in-steel-design-add-on/3375)
**Author:** [@JannickHansen](https://community.dlubal.com/u/JannickHansen)\ **Replies:** 2\ **Last updated:** [April 24, 2026, 5:35pm UTC](https://community.dlubal.com/t/determination-of-alpha-cr-for-m-cr-in-steel-design-add-on/3375 "2026-04-24T17:35:26Z")
Hello everyone, I have a question regarding the Steel Design add-on and the calculation of Mcr. I am working with a 2D rigid frame and using the default Eigenvalue Method for the evaluation of Mcr. What I am trying t… --- ## [Implementation of Arc length method](https://community.dlubal.com/t/implementation-of-arc-length-method/3374)
**Author:** [@dbesed](https://community.dlubal.com/u/dbesed)\ **Replies:** 1\ **Last updated:** [April 22, 2026, 12:10pm UTC](https://community.dlubal.com/t/implementation-of-arc-length-method/3374 "2026-04-22T12:10:49Z")
Hey, I was wondering if there are any plans to implement arc length method in in RFEM 6 in the near future. --- ## [Steel connection verification: result combination not evaluable](https://community.dlubal.com/t/stahlanschlussnachweis-ergebniskombination-nicht-auswertbar/3330)
**Author:** [@Mzabi2025](https://community.dlubal.com/u/Mzabi2025)\ **Replies:** 4\ **Last updated:** [April 20, 2026, 10:00am UTC](https://community.dlubal.com/t/stahlanschlussnachweis-ergebniskombination-nicht-auswertbar/3330 "2026-04-20T10:00:45Z")
Dear Dlubal support team, I am contacting you regarding a problem with the steel connection verification in RFEM 6. During the verification, I receive the following error message: “ER9004 – Result combination for stress-strain… --- ## [🛠️ Partial Internal Forces Method in RFEM 6](https://community.dlubal.com/t/partial-internal-forces-method-in-rfem-6/3221)
**Author:** [@carina.zinnbauer](https://community.dlubal.com/u/carina.zinnbauer)\ **Replies:** 0\ **Last updated:** [April 13, 2026, 1:30pm UTC](https://community.dlubal.com/t/partial-internal-forces-method-in-rfem-6/3221 "2026-04-13T13:30:11Z")
:right\_arrow: Gain practical insights. Enhance your skills. Connect. Join our webinar Partial Internal Forces Method in RFEM 6 – presented by experts, made for practice. Webinar Highlights :white\_check\_mark: Theoret… --- ## [🛠️ Partial Section Forces Method in RFEM 6](https://community.dlubal.com/t/teilschnittgrossenverfahren-in-rfem-6/3220)
**Author:** [@carina.zinnbauer](https://community.dlubal.com/u/carina.zinnbauer)\ **Replies:** 0\ **Last updated:** [April 13, 2026, 1:30pm UTC](https://community.dlubal.com/t/teilschnittgrossenverfahren-in-rfem-6/3220 "2026-04-13T13:30:11Z")
:right\_arrow: Gain insights. Deepen your knowledge. Connect. Join our webinar on the partial internal force method in RFEM 6, presented by experts and designed for practical application. Webinar highlights :white\_check\_mark: … --- ## [Stability proof of top flange with singly symmetric composite cross-section](https://community.dlubal.com/t/stabilitatsnachweis-zusammengesetzter-querschnitt/3235)
**Author:** [@IPE300](https://community.dlubal.com/u/IPE300)\ **Replies:** 4\ **Last updated:** [April 8, 2026, 3:00pm UTC](https://community.dlubal.com/t/stabilitatsnachweis-zusammengesetzter-querschnitt/3235 "2026-04-08T15:00:35Z")
Good day, I am trying to design a truss girder using the RSTAB 9 program. The top chord consists of a composite, simply symmetrical cross-section (see image in the attachment), which is subjected to distributed load… --- ## [Design of thin-walled surface elements (1 mm steel sheet)](https://community.dlubal.com/t/brandbemessung-dunnwandiger-flachenelemente/3157)
**Author:** [@ÜnalTezcan](https://community.dlubal.com/u/%C3%9CnalTezcan)\ **Replies:** 4\ **Last updated:** [April 2, 2026, 2:35pm UTC](https://community.dlubal.com/t/brandbemessung-dunnwandiger-flachenelemente/3157 "2026-04-02T14:35:30Z")
Hello everyone, I am working on a question regarding the shape stability of horizontal fire barriers made of steel sheet (1 mm) in ventilated curtain wall façades (VHF). I have measured temperature data from a fire test… --- ## [Cross-sectional optimization through steel design via Dlubal API](https://community.dlubal.com/t/querschnittsoptimierung-bei-stahlbemessung/3167)
**Author:** [@jbo-puls](https://community.dlubal.com/u/jbo-puls)\ **Replies:** 2\ **Last updated:** [March 26, 2026, 8:26am UTC](https://community.dlubal.com/t/querschnittsoptimierung-bei-stahlbemessung/3167 "2026-03-26T08:26:21Z")
Good day! I would like to use the cross-section optimization of the steel design module of RFEM 6 via the Dlubal API. The tooltip suggests that this property is directly available during the cross-section creation via addon\_… --- ## [Understanding problem result cut evaluation/comparison result bar](https://community.dlubal.com/t/ergebnisschnittauswertung-ergebnisstab/3079)
**Author:** [@DeflectionPerfection](https://community.dlubal.com/u/DeflectionPerfection)\ **Replies:** 6\ **Last updated:** [March 24, 2026, 11:27am UTC](https://community.dlubal.com/t/ergebnisschnittauswertung-ergebnisstab/3079 "2026-03-24T11:27:25Z")
Good day again, I am currently having some difficulty understanding exactly how certain internal forces or the resultants of the result sections come about: send\_without\_results\_Dlubal.rf6 (2.3 MB) I am looking… --- ## [Verification of hollow profile stability is not recognized as vulnerable to lateral-torsional buckling](https://community.dlubal.com/t/stabilitatsnachweis-hohlprofil-biegedrillknicken/2930)
**Author:** [@lschn](https://community.dlubal.com/u/lschn)\ **Replies:** 5\ **Last updated:** [February 23, 2026, 12:51pm UTC](https://community.dlubal.com/t/stabilitatsnachweis-hohlprofil-biegedrillknicken/2930 "2026-02-23T12:51:48Z")
In the proof ST3100.00, a hollow section 140 x 70 x 4 (cold) is defined as a component susceptible to lateral-torsional buckling and accordingly kzy is not reduced by 0.6 (Table 8.8 EC3-1-1). Is there an error on my part… --- ## [Documentation for RFEM Add-ons](https://community.dlubal.com/t/documentation-for-rfem-add-ons/2878)
**Author:** [@arscaribe](https://community.dlubal.com/u/arscaribe)\ **Replies:** 5\ **Last updated:** [February 21, 2026, 6:36pm UTC](https://community.dlubal.com/t/documentation-for-rfem-add-ons/2878 "2026-02-21T18:36:00Z")
Hi everyone, I have been using RFEM 6 for my studies for some time now, and I find it to be an excellent tool for structural analysis. However, I am having trouble finding comprehensive, up-to-date manuals that explain … --- ## [Modelling steel sections inside concrete sections](https://community.dlubal.com/t/modelling-steel-sections-inside-concrete-sections/2783)
**Author:** [@PedroSoares](https://community.dlubal.com/u/PedroSoares)\ **Replies:** 3\ **Last updated:** [February 20, 2026, 7:31am UTC](https://community.dlubal.com/t/modelling-steel-sections-inside-concrete-sections/2783 "2026-02-20T07:31:43Z")
Hello everyone. I´m trying to model a thin-walled C section that will be placed inside a concrete section (see image bellow), but I cant find a way to do it. When I try to calculate the section using RSECTION, it sa… --- ## [Modeling beams in different planes sharing a connection node](https://community.dlubal.com/t/modeling-beams-in-different-planes-sharing-a-connection-node/2774)
**Author:** [@frogoil](https://community.dlubal.com/u/frogoil)\ **Replies:** 2\ **Last updated:** [February 2, 2026, 4:09pm UTC](https://community.dlubal.com/t/modeling-beams-in-different-planes-sharing-a-connection-node/2774 "2026-02-02T16:09:00Z")
Hello, I am trying to bolt the two beams, which are selected in the image, together in a similar manner to how the column is bolted to the middle beam above. I am currently running into an issue where I’m unable to h… --- ## [Modeling stacked beams bolted together](https://community.dlubal.com/t/modeling-stacked-beams-bolted-together/2758)
**Author:** [@frogoil](https://community.dlubal.com/u/frogoil)\ **Replies:** 4\ **Last updated:** [February 2, 2026, 4:08pm UTC](https://community.dlubal.com/t/modeling-stacked-beams-bolted-together/2758 "2026-02-02T16:08:05Z")
I am modeling a steel frame in RFEM where two beams and a column are stacked vertically and bolted together, based on a Rhino geometry I created earlier. I am now at the stage of testing and validating the system. I cur… --- ## [📥 Shading Roof – Porta Genova Station in Milan](https://community.dlubal.com/t/shading-roof-porta-genova-station-in-milan/2692)
**Author:** [@soeren.omieczynski](https://community.dlubal.com/u/soeren.omieczynski)\ **Replies:** 0\ **Last updated:** [January 23, 2026, 12:00pm UTC](https://community.dlubal.com/t/shading-roof-porta-genova-station-in-milan/2692 "2026-01-23T12:00:10Z")
Check out this 3D RFEM model to enhance your skills and: See how others set up and analyze models Explore advanced features, including specialized add-ons Pick up ideas and perspectives ▶ Shading Roof – Porta Genova… [Next page](https://community.dlubal.com/tag/addon-steel-design/46.md?match_all_tags=true&page=1&tags%5B%5D=addon-steel-design)