Istrazivanja i projektovanja za privreduJournal of Applied Engineering Science


DOI: 10.5937/jaes12-5818
This is an open access article distributed under the CC BY-NC-ND 4.0 terms and conditions. 
Creative Commons License

Volume 12 article 291 pages: 179 - 186

Aleksandr Romanovich Tusnin 
Moscow State University of Civil Engineering (MGSU), Moscow, Russia

Milan Prokic 
Moscow State University of Civil Engineering (MGSU), Moscow, Russia

In steel structures, the I-beams are in many cases exposed to combination of bending moment and bimoment actions. In the elastic stage of work, material strength check is based on maximum normal stresses, which for symmetric I-beams are the sum of moment and bimoment stresses. The maximum stresses are compared with calculated resistance. In both European codes and Russian standards for design of steel structures, calculation of members is performed considering the conditions in which the plastic deformations over the section are allowed. With the development of plastic strains, bearing capacity of section is higher than in the elastic stage. The existing normative documents for the design of steel structures in Russia do not include design coeficient taking into account development of plastic deformations in warping torsion. The article examines combined action of bending moment and bimoment on I-beam proiles throughout the theoretical and numerical solu- tions. Recommendations for checking their bearing capacity in accordance to Russian standards are given, taking into account development plastic deformations.

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