Engineering our Status

The purpose of this feature is to encourage the use of the first parts of Eurocodes 2 and 3, for the design of concrete structures and steel structures, respectively, during their initial validity of 3 years. J.F.A. Moore

The semi-analytical finite strip method of analysis is used to study the local buckling of composite box sections in negative bending consisting of a concrete deck connected to a steel trough. Design charts are produced to determine the local buckling coefficient for the web. It is then shown how this local buckling coefficient may be used to calculate the web width-to-thickness ratio that delineates the boundary between the section classifcations of semi-compact and slender. The method is illustrated by an example. M.A. Bradford and T.C. Wong

Penetrations are commonly placed in the webs of steel beams (or steel joists for composite beams) to permit the passage of building services. Experimental investigations indicate that the differential deflection across a web penetration can be significant and that local yielding commences around the penetrations even at working loads. In Australia, neither the steel structures Code (AS 4100) nor the composite construction Code (AS2327) gives specific recommendations with regard to design for penetrations. This paper provides designers with a simplified, and yet rational, method to determine the elastic deflection of steel and composite beams with web penetrations. P.H. Dayawansa