Abstract
The results of numerical and experimental researches of local bending problems, carried on classic and medium-wide I profiles, were a basis for the adoption of the current standards (EN 15011: 2014) which regulates the action of the local stress caused by the effect of cart wheels. Regarding the fact that IPB (HE-B) wide flange profiles are largely used for production of the main carriers of monorail transport systems, this paper presents the results of the action of the local stress caused by the effect of cart wheels on the HE-A flange profile, using the methods and procedures of relevant researchers, the procedures prescribed by the standard EN 15011 as well as the results of calculations using finite element method. It has been revealed, based on comparative analysis of the results, that in the transition zone low flange / rib longitudinal local stress on the lower contour flange, determined using the above mentioned standards have tightening characteristic, while all other methods, including finite element method, give the pressing nature of the considered voltage. In addition, all of these procedures, except for the finite element method, adopt the assumption that absolute value of voltage, caused by local bending on upper and lower contour of the loaded flange, are the same, and there is no physical justification. Bearing in mind the fact that stress identification, caused by the flange local bending, is an extremely important phase proving the strength of monorail beams, we may conclude that the application of standard EN 15011 does not provide reliable results when it comes to wide flange profiles.
Highlights
Obični I profili imaju veću debljinu pojaseva od IPE profila, čiji su pojasevi najtanji za istu visinu poprečnog preseka
It has been revealed, based on comparative analysis of the results, that in the transition zone low flange / rib longitudinal local stress on the lower contour flange, determined using the above mentioned standards have tightening characteristic, while all other methods, including finite element method, give the pressing nature of the considered voltage
Summary
Izgled poprečnog preseka nosača opterećenog lokalnim dejstvom točkova kolica, slika 2, asocirao je (a). Najveći naponi očekivani su u zoni tranzicije donji pojas/rebro, odnosno u ukleštenju ekvivalentne konzole, presek 0, slika 2, dok naponska stanja neposredno ispod točka (presek 1) i na slobodnoj ivici donjeg pojasa (presek 2) nisu podrobno analizirana, osim u standardu EN 15011. Slika 1 – (a) Lokalno dejstvo točkova na donji pojas glavnog nosača [1]; (b) distribucija napona izazvanih globalnim i lokalnim savijanjem [2]. Veličine napona izazvanih lokalnim savijanjem zavise i od debljine pojasa. Obični (klasični) I profili imaju veću debljinu pojaseva od IPE profila, čiji su pojasevi najtanji za istu visinu poprečnog preseka. Prva rešenja [3] problema određivanja napona izazvanih lokalnim savijanjem pojaseva nosača dobijena su primenom teorije savijanja ploča. Slika 2 - Nosač otvorenog poprečnog preseka (HE-A 360) opterećen točkovima kolica
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
