Geometric substitute imperfections for load carrying capacity proof to flexural buckling of pressure bars

The main focus of the article is on investigations about the lateral buckling of compression members made of hot-rolled I-profiles. First of all the general load-carrying behaviour is clarified. Afterwards necessary member imperfections are determined in case of pure normal force or combined bending stress. The results are compared to the values of the actual design codes. For members with pure compression force and buckling about the strong axis new member imperfections are specified. By these values up to 12% higher ultimate loads as up to now can be utilized.

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