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The Structural Engineer

(As Dr. Sarkar was unable to be present, Professor Evans was supported in his presentation of the paper by Mr. M. G. A. Khalil.) Mr. L. F. Gliniecki (Associate-Member) asked whether a beam reinforced with mild steel would develop the same pattern of cracking as a beam reinforced with high tensile steel.

The Structural Engineer

Professor A. L. L. Baker (Member) opened the discussion by saying that he agreed entirely with what the authors had said in their presentation but not with what they had written in the paper. He agreed with the statistical, probabilistic approach. It was obviously the only logical way of dealing with the variations of strengths of materials and the variations and vagaries of loading. There were one or two points in the paper which Professor Baker found slightly misleading. First of all, the matter of basing a design entirely upon a probability of failure-10-7-and a minimum cost, and saying that one could not entirely guarantee a structure against failure, needed some qualification. He thought this was rather a dangerous statement.

The Structural Engineer

The following is a precis of a paper which is filed in the Institution's Library (reference X( 11) ). Copies are available for borrowing by members of the Institution in the United Kingdom or can be consulted at the Institution. Dhanhjoo N. Ghista

The Structural Engineer

Dr. A. J. Dutt (Senior Engineer, Special Structures, Greater London Council) said the London Museum Radio Tower-the tallest in this country-was one of the nicest buildings, and a centre of tourist attraction, not only from the point of view of functional requirements but also from the architectural point of view. Proper assessment of wind loading was one of the principal structural design considerations for these towers and Dr. Dutt wanted to raise a few points on that aspect.

The Structural Engineer

Although acceptable in most construction, the presence of shutter ties in unlined concrete water-retaining structures may form a potential source of leakage. This paper describes work undertaken to determine whether such leakage could occur and, if so, its practical importance and the factors influencing it. P. Jackson

The Structural Engineer

Tests were made on 106 small-scale aluminium stanchions of I-section, loaded by an axial load P and one end moment M1 in the plane of the web; the slenderness ratios ranged between 27 and 79. For each slenderness the P-M1 relationship at collapse was well approximated by a parabola. G. Augusti and B. Barbarito