LTB resistance of beams influenced by plastic reserve or local buckling

Abstract eng:
The results of original procedure concerning calculation of the values of the critical moments Mcr using approximate formulae convenient for educational and standardization purposes are presented. The authors formulae are today used in many international and national standardization documents (e.g. in several Eurocodes and their National Annexes), in engineering practice of 32 countries and in educational process at many Universities (e.g. in EPU de São Paulo, EPFL Lausanne, etc.). New C1 values are presented for beams under combination of uniform loading and unequal end moments. Development of useful modification of Eurocode formulae for lateral torsional buckling resistance Mb,Rd, which enable to show very clearly the influence of plastic resistance and local buckling on LTB resistance of metal (steel, stainless steel, aluminium) and timber beams calculated by any of four Eurocode methods.

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