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An Ordinary General Meeting of the Institution of Structural Engineers was held at 11 Upper Belgrave Street, S.W.1, on Thursday, November 28th, 1940, at 1 p.m., Mr. J. F. Butler, M.I.Struct.E., A.M.1nst.C.E. (President) in the Chair.
THE CHAIRMAN (Mr. J. F. Butler, M.I.Struct.E., A.M.Inst.C.E.), introduced Mr. Leeming, and said that the paper, which was published in The Structural Engineer for December, 1940, was adapted and extended from part of a thesis which Mr. Leeming had submitted to the University of Oxford for the degree of B.Sc. The paper would be taken as read, but he invited Mr. Leeming to introduce it and to add anything he wished to add.
IN a previous paper in the "Structural Engineer" some reference was made to the stress distribution in beams in which the bond between the concrete and the tension reinforcement had been eliminated and methods were given for calculating the stresses in both the reinforcement and concrete of such beams. The ability of the concrete to develop stress in the tension reinforcement by bond is bound up with its ability to transmit shear and, if the bond fails, the tension reforcement will behave as a tie rod. The experiments referred to in the previous paper have been extended to normal reinforced concrete beams of varying span with different types of shear reinforcement,
a study of the bond being made by examining the stress distribution on vertical sections. In this paper attention is devoted to (a) the stress distribution on vertical sections after the failing load in shear or diagonal tension has been almost
reached, (b) the influence of vertical stirrups, inclined stirrups and bent-up rods on the maintenance of the bond or adhesion between the tension reinforcement and the concrete.