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Mr. Victor L. Gill (F): I would like to express my great admiration for the sheer magnitude of the work which Professor Leonhardt and Dr. Schlaich have undertaken and also the meticulous attention to detail and the engineering skill with which it has been accomplished. Briefly, there are one or two small points which I would like to make. First of all, what account has been taken of creep and relaxation in the cables? The emphasis on dimensional accuracy makes me wonder whether this may pose a problem. This is also coupled with the stress limits in the cables, but perhaps you would be good enough to comment on that point.
Continuous composite beams can only be designed by simple plastic theory if the hinges at the supports have adequate rotation capacity. This is often controlled by local buckling of the webs and flanges. Tests to determine the effect of local buckling on the rotation capacity of composite beams under negative bending are described, Comparisons are made with limiting web and flange slenderness ratios currently used in steel design both in Great Britain and in North America. It is found that some of the existing regulations can be applied to composite beams, but that others may be unsafe, for both steel and composite beams. Alternative rules are proposed.
J. Jay Climenhaga and R. Paul Johnson