Influence Line Computations for Structures with Members of Varying Flexural. Rigidity Using the Elec

Mr. K. H. BEST (Member), said Mr. Davies had summarised the factors affecting the design of winding towers and had pointed out that these structures presented unusual and interesting problems, for which there were no standard solutions; and there was very little published information.

Composite construction, using rolled steel beams and concrete floor slabs, has been used for construction of highway bridge decks and building floors for a considerable number of years. So far as the Authors are aware, no comprehensive experimental investigation has been undertaken to determine the effective width of floor slab which may be assumed to act as the compression flange in such beams. The following paper describes laboratory tests carried out on four small scale composite beam and slab floors, from which the effective flange width of the composite tee-beams has been determined in each case. Sean Mackey and Franklin Kai Cheong Wong

Mr. 0. BONDY (Member), described the paper as impressive, and invited the authors to enlarge on one or two technical points.