Issue 8

The following is an attempt to calculate the moments of resistance of groups of bolts or rivets connecting brackets and cantilevers of steel construction to their supports. W.A. Durose

To the Editor of The Structural Engineer. Sir,-The paper in your June issue by E. Copeland Snelgrove on The Design of Concrete Tanks presents some significant facts concerning the stability or rather lack of stability in concrete walls designed to sustain water pressure, but designed in total disregard of the simple principle of mechanics which tells us that confined water will exert a pressure gauged by the head to the free water surface.

As an example of the procedure to adopt let us take two equal spans continuous over three supports and assume our unit load to occupy a position (a) distant k 1 from the support 3 and apply our theorem assuming continuity to be maintained:- J.W.E. Penrose

Fifty-one candidates entered for the competition for the Dorman-Long Scholarship (value 8300 and gold medal. Open to all members of the Institution). Of these, thirty-four completed their sketch designs for the first part of the competition, and twenty sent in the final completed designs.

The following description of a combined concrete and steelwork structure of somewhat unusual character may not be without interest.The structure in question is the Sheffield City War Memorial. The War Memorial Committee, in 1924, invited competitive designs, and in response, about forty designs were sent in and the one about to be described was ultimately chosen. One condition was that the cost should be limited to about 65,000. All the designs offered with the exception of the one selected, were monuments in masonry or masonry and concrete combined. The choice of the premiated design was possibly influenced by itsomewhat novel character, although from the point of view of longevity, it mustcompare unfavourably with a memorial built entirely of stone. The memorial, Fig. I, consists of a Venetian mast about 100 ft. in height springing from an octagonal bronze base which stands on a sandstone ashlar curb. The mast is constructed of mild steel plates riveted together so as to present a smooth surface to the outside. It is surmounted by a suitable finial and carries a bronze pulley at the summit for hoisting flags, painting or repairing cradles, &c. The bronze monument constituting the base stands about 20 ft. high, and bears the arms of the various branches of the services and is surmounted by four figures in mourning attitude. The work involved in the construction may be divided conveniently into four sections-the artistic portion comprising the bronze castings, the mast profile and the cut stonework-the steel mast-the reinforced concrete foundation, and finally the erection. A short account of the structural features will probably be of the greater interest to members. Prof. Husband