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Sir,-We welcome this paper by Dr. Wood because for the first time in an official publication the nonproportionality of the stanchion moments with the load, for increase of loads above the design loads, is recognised and the irrational basis of the theory published by the Steel Structures Research Committee is clearly demonstrated.
The method presented here is applicable only to portal frames with hinged base columns, but as about 80 per cent. of every-day portal design comes under this category, it must be agreed that this fact does not seriously affect its usefulness to the designer. J.F. Horridge
The authors have presented an interesting method for the rapid estimation of maximum bending moments in decks of suspension bridges. Their approximate analysis draws to a logical conclusion the more general method described by Bowen and Charlton (reference 3 of the paper). It is clear that the use of symmetry and antisymmetry offers a considerable computational advantage :two sets of three linear simultaneous equations are solved far more quickly than one set of six. F. Van der Woude, M.S. Gregory and H.I.A. Hegab