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The Minister of Housing and Local Government formally laid before Parliament on 5 February the Building (Fifth Amendment) Regulations 1970. These regulations, if approved, will come into operation on 1 April 1970 but will not apply to work that was: (a) completed before the date of the coming into operation of these regulations; or (b) completed after that date in accordance with plans deposited with the local authority before that date, with or without any departure or deviation from those plans.
Particular requirements of a length of urban elevated motorway are described, which have been satisfied by the use of a bridge deck using ‘top-hat’ section box beams with
no transverse diaphragms. The deck has proved economical and suitable for a wide range of bridges. During the development of the design of the deck, methods of analysis for the effect of concentrated loads have been investigated and the paper describes an approach based on finite element techniques and the derivation from this of a simpler
technique for design ofice use, both of which provide satisfactorily accurate results.
D.M.A. Hook and B. Richmond
The general theory of beams curved in plan with torsional restraint at the supports is explained, with particular reference to prestress loading. It is proved that the torsional moments due to prestress loading are solely dependent on the support bending moments, and the conditions of concordancy are formulated for a circularly curved beam.
It is suggested that for most practical cases the support bending moments in circularly curved beams can be calculated to sufficient accuracy assuming the beam is
straight, and the order of accuracy is given. A similar approximation can also be made when analysing the effects of loads other than prestress.
R.J. Garrett and R.A. Cochrane