ANALYSIS OF SHEAR BUCKLING OF STEEL BEAM-WEBS WITH CIRCULAR OPENIGS

In spite of half century experience of application of perforated beams the local bucking of their webposts is not finally researched till now. In manuals there is no relations for their critical loads corresponding to buckling of web-posts under shear. In the study the numerical analysis by the finite element method is performed for evaluating the local stability of simply supported cellular beam-webs with circular openings. Variant of loading of beam with concentrated force was considered, which assure constant value of shear force along the length of beam. Obtained empirical relation allow take into account not only parameters of perforation but influence also of bending moment on the shear buckling of web-posts. Analysis by FEM also confirmed permitted accuracy of analytical approach to evaluation of stability of web-posts.