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I find this paper particularly interesting because my firm were recently engaged by a company manufacturing precast prestressed concrete components to carry out a design study of the behaviour of their strip-type (66 mm deep section) lintels in composite action with brickwork, with the intention of preparing safe load tables and design charts. Our problem was essentially a special case of reinforced brickwork with the embedded bar reinforcement replaced by a prestressed concrete section able to sustain some tension at service loads. After studying the literature, we decided to make an allowance for the effect of the shear arm ratio which is vindicated by the authors' results.
Dr. Goode's paper gives some very interesting data on long-term torsional effects in reinforced concrete and particularly illustrates how 'torsion shedding' can occur in continuous structures. The comparison of strengths with those calculated from CP110 raises two points.
Dr. R.A. Swann
Mr. A. M. Muir Wood (Sir William Halcrow B Partners): I think I am possibly the only one here who has been concerned with each stage of this project from its rebirth, as it were, in 1959 until the date of its suspended animation in 1975. While I have been concerned with it on and off-mostly off-nevertheless, I have seen a number of changes and constant evolution.