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The Structural Engineer

This paper describes laboratory tests carried out to destruction on three prestressed concrete bridge beams, two of which were composite, partially prestressed beams, containing tensioned and untensioned wires. Load deflection curves and strain measurements have proved the full co-operation of tensioned and untensioned wires up to failure, the resilience being similar to that of ordinary prestressed concrete beams without untensioned wires. P.W. Abeles

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Author – Abeles, P W

Price – £9

The Structural Engineer

Comparative tests on beams reinforced with various types of large size bars, both in ordinary grade and high grade concrete, have proved the superiority of cold worked steel over steel having a natural yield point regarding factor of safety and warning before failure. They have also proved the advantage of a ribbed pattern as against plain bars from the point of view of bond and crack formation and the necessity of increasing the strength of reinforcement with improved bond in order to avoid failure without warning. Suggestions are made for certain revisions of the Code of Practice C.P. 114 (1948) and B.S. 1144 so as to allow the economical use of high quality steel as reinforcement of concrete. Dr. K. Hajnal-Konyi

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Author – Hajnal-Konyi, K

Price – £9