biaxial bending. beam columns. second order theory. imperfectionsNiko, Igor, 1992- Resistance of members subjected to combined loads according to EC3 and EC9. -- 10.1556/606.2017.12.3.3. In: Pollack Periodica. -- ISSN 1788-1994. -- Vol. 12, no. 3 (2017), s. 23-32.