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This paper takes the form of a summary of a closed meeting on the same subject organised by the British Group of the International Association for Bridge & Structural Engineering (IABSE), held at Pembroke College, Cambridge, on 12-14 July 1983. The authors are fortunate both in being the organising committee for the IABSE event, and in being invited by the Institution to bring the subject-matter to a wider audience. J.B. Menzies, A.C.E. Sandberg and G. Somerville
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
Mr G. F. J. Nash (Constrado): The author has shown in his paper the means by which the design strength of bolts is calculated for friction, shear, and bearing, at both ULS and SLS.