INFLUENCE OF CONSTRUCTIVE DESIGN ON THE STRESS LEVEL IN STEEL BEAMS WITH OVAL AND CIRCULAR OPENINGS

Abstract

With help of FEM it is considering influence of structure design of cellular beams on the stress level in them. It was analyzed scheme of beams containing only regularly located circular openings, regularly located oval openings and variants of perforation with alternate oval and circular openings. All design schemes correspond to real constructions applied in structural practice. Numerical analysis is carried out with help of program complex ANSYS for simply supported beams loaded with concentrated force at midspan. Stress concentration was determined as relation of maximum equivalent stresses on Mises in region of openings to the stress level in flanges of the same sizes beams with solid web. For beams with circular and oval openings it is represented empirical relations for values of maximum stresses.