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The Structural Engineer, Volume 65, Issue 13, 1987
An experimental and analytical investiagation of the punching shear capacity and moment transfer characteristics of reinforced concrete flat slabs at the edge column location is presented. In all, 12 models with carefully controlled boundary conditions were tested. Six of these were used to investigate the effect of column aspect ratio and size on the punching shear capacity. The remaining models were further reinforced using shearhead reinforcement, the main variable being the length and type of shearhead. From the results of the investigation a method for predicting the punching shear capacity has been proposed, based on the shear criterion of failure and designed to cover the use of shearhead reinforcement. Comparison with the British and American Codes of Practice reveals it to give consistently more accurate and reliable estimates of the punching shear capacity than either of those methods. S.G. Gilbert and C. Glass
Results of an experimental investigation into environmental thermal strains and stresses in concrete members are reported, of relevance to temperature gradients in bridge decks. M. Richardson and A.R. Selby
The paper sets out by examining methods that have been suggested for designing reinforced concrete columns in a fire, together with their drawbacks. The main part of the paper dicusses the theoretical background of a recently developed computer program SAFE-RCC (Structural Analysis of Fire Exposed Reinforced Concrete Columns) which takes account of the change in loadcarrying capacity and stiffness of a column during a fire, together with the change in stiffness of the framingsystem at each end of the column. Following the presentation of results from some proving tests, the results from an exploratory series of runs are presented in which it becomes very clear that the flexural stiffness of the restraint system plays a large part in determining the fire response. J.A. Purkiss and N.J. Weeks