Elastic Deflections of Simply Supported Steel I-Beams with a Web Opening

Forming openings in the web of steel beam gives rise not only to strength problem but also stiffness problem, that is, the deflection of beam may be too large to meet the requirements. However to calculate the deflection it is faced that the region of web opening is three times statically indeterminate, which makes the deflection calculation of perforated beams extremely complicated. In order to avoid solving the redundant forces and obtain applicable formulas for determining deflection of perforated beam the author of this paper have derived applicable formulas by direct solving differential equations and solving differential equations combined by using displacement method. Results from these formulas are compared with those form finite element method and show a good agreement and high precision.