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U radu se prikazuje geneza nastanka prilično zakašnjelog Eurokoda3-dio 1.5 koji se odnosi na probleme ploča naprezanih u svojoj ravnini. U tom je dokumentu značajan problem stabilnosti limova. Poslije testiranja prijedloga raznih autora, u probnoj normi ENV usvojena je nešto korigirana Winterova formula za konačnu normu EN. Uspoređuje se i sada važeća hrvatska norma HRN U.E7.121 koja je u primjeni još od 1986. Na jednostavnom numeričkom primjeru pokazana je primjena nove norme., Authors discuss the genesis of the quite belated Eurocode 3 - Part 1.5 in which problems of plates stressed in ther own plane are regulated. A highly significant issue treated in the document is the problem of plate stability. After analysis of solutions presented by various authors at the presntandard stage (ENV), a somewhat corrected Winter's formula was adobped for the final standard (EN). This standard in compared to the current Croatian standard HRN U.E7.121 which has been in use since 1986. The application of the new standard is shown on a simple numerical example.