Author: Lowson, W W
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Lowson, W W
This paper describes tests that have been carried out to determine the long-term deformation characteristics of Lytag lightweightaggregate concrete, in axial compression and deflection; comparisons are made with gravel concretes made from London-area aggregates. Professor R.H. Evans and W.S. Paterson
Dr. Le-Wu Lu (Research Associate-Professor of Civil Engineering, Lehigh University, Bethlehem, Pennsylvania) writes:- 'The authors are to be congratulated for contributing an interesting paper in an area which has attracted considerable attention in recent years. The use of computers in elastic-plastic analysis provides not only the potential of dealing with highly complex structures but also the capability of inclusion of many so-called "secondary effects". The program developed in the paper has attempted to include almost all the major secondary effects, except, as the authors noted, the following two:- (l) the effect of reduction of plastic moment (2) the spread of plastic zones in the members.
Architecture and civic design face serious problems of location, structure and accessibility, arising from the condition of crowded urban societies in every part of the world-even the newly developed: unprecedented increases in numbers, rapid technological advance, greater mechanization and new concepts of space and scale; but less corresponding capacity, as yet, to adapt social institutions and controls to cope with accelerating population and growth rates: more affluence and leisure on the one hand, and on the other a growing majority of people inadequately fed and housed. There is thus a universal migration into cities coupled with a deterioration in urban environment; as the vehicle ousts the pedestrian, utilities replace the monument and advertisement-commercial and public-camouflages the noticeable parts of the civic structure and furniture which man has already designed for purposes of living, working, playing and meeting his fellow-men. William Holford