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Dr. K. Fisher (Chief Technical Officer, Redland Brick): Mention was made in the paper of model testing of diaphragm walls, an aspect given further mention in the accompanying paper. I should like to comment briefly on the axial loading tests which we carried out at Redland on model diaphragm walls. (The results have been fully detailed in a paper given to the 5th International Brick Masonry Conference held in
Washington at the end of 1979.)
Mr C. W. Brown (Freeman Fox & Partners): I should like to congratulate the authors on their most refreshing approach to the design of the structures in question and on not being tied up in all the advanced mathematics that one is apt to meet these days. They have a fairly simple extension to BS 153. I do notice, however, that shear lag has appeared in the paper; what were the shear lag factors actually used for? Did the authors calculate the peak stresses in their box girders and compare these with allowable stresses, or did they use shear lag purely for fatigue analysis-or what? I should have thought that, from the proportions of the ramps, shear lag would not play a very large part in overall behaviour.
A collapse this year in America has highlighted the problem of rhythmic loading on the floors of dance halls, and we have received the following letter from Mr W. G. Scott (of Lothian Regional Council) who was involved in some of the problems at Edinburgh Playhouse.