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A General Meeting of the Institution of Structural Engineers was held on Thursday, 3rd October, 1957, at 6 p.m., when the Presidential Address for the Session 1957-1958 was given by Professor Sir Alfred Pugsley, O.B.E., D.Sc.(Eng.), F.R.S., M.T.Struct.E., M.I.C.E., F.R.Ae.S.
THE behaviour of castellated I beams which are primarily I beams with regularly spaced hexagonal holes in the webs is investigated for the case of bending in a simply supported centrally loaded beam. An approximate analysis is presented which presumes
that the beam will behave as a vierendeel girder, this is followed by a photoelastic investigation in which a model castellated I beam is used. The second part of the experimental investigation is concerned with the stress distribution and deflections of
actual steel castellated beams as supplied by the manufacturers. The derived theory is applied to both the latter and the previous photoelastic investigation. Finally the elementary beam theory as used by the manufacturers in compiling safe load tables is examined in relationship to the presented theory and the experimental results.
J. E. Gibson and W. M. Jenkins
THIS paper describes a mathematical and experimental investigation into the behaviour of gantry cranes when long travelling. The work was started because of the severe wear suffered by the crane wheel flanges and the gantry rails in a number of heavy engineering works. Cranes designed with either cylindrical or conical tread wheels are in common use, and in either case a pair of wheels may or may not be made to rotate at identical speeds by means of a cross-shaft. These systems are analysed and their faults discussed. Axial float of the wheels in their bearings and the tread widths of wheels are also discussed.
P. M. Worthington