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I feel that the views and comments expressed by Mr McQuillan should not pass without comment. I would therefore like to make the following comments and pose certain queries that have not been covered adequately in the ‘Viewpoint’ article. Mr. K.R. Jackson
The design of slabs is dependent on an understanding of the manner in which internal forces and moments are mobilised. The paper examines linear slab behaviour in zones near free edges. It is shown that analysis based on ‘thick-plate’ theory provide predictions consistent with test data and 3-dimensional analysis, whereas analyses based on classical or ‘thinplate’ theory do not. Two cases are examined in which design against shear failure can be critical. These are a skew bridge slab and a flat building slab. In both cases, the internal actions are shown to be different to those commonly assumed. It is shown that finite element analysis, using the heterosis formulation for ‘thick-plate’ theory, requires a mesh considerably finer than that commonly used in edge zones for reliable results to be provided. R.J. Cope and P.V. Rao
The legal implications of ground heave and subsidence and of damage to relatively new buildings and to old buildings will tend to be somewhat different. Russell G. Grahame