Abstract
The deflection of steel beams with circular openings is dependent on the loss of bending stiffness and shear area of the web, which adds to the deflection of the solid web beam. The additional deflection is a function of the ratio of opening diameter, ho, to section depth, h, and also of the spacing of the openings. This paper presents derived formulae for the additional deflection of beams with circular web openings that are expressed as a function of the pure bending deflection of the unperforated beam. The formulae are calibrated against finite element models and against short span beam tests with opening diameters, ho, of 0.6 h and 0.72 h, in which the additional defection is mainly due to the effects of shear. Further simplified design formulae for additional deflection are also presented which are shown to be accurate for C-section beams with a span: depth ratio exceeding 15. It is also shown that circular openings may be represented for analysis purposes as an equivalent rectangle of width x depth equal to 0.75 ho x ho.
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