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The Structural Engineer, Volume 11, Issue 4, 1933
Sir,-In the March number of the Institution's journal a letter appears under the signature of Mr. G. Robertson, asking for an amplification of the explanation given in reply to his query on the danger of the action of creep in portal frame bridges during the discussion of my paper on the Creep of Concrete under Load.
In all the structures with which it is proposed to deal it is assumed that the displacements caused by the application of loads are so small that in calculating the forces in the various parts of the structure its initial form may be assumed. In most structures this may be done without appreciable error and, as a consequence, we may express any static function H, such as a reaction R, a force S, a bending moment M, a shearing force Q, deflexion... H.A. Whitaker
Although articles published in The Structural Engineer normally deal with large scale engineering, it is thought that a brief account of certain R.C.C. work carried out during recent operations on the North West Frontier of India, may be of interest its comparative insignificance being perhaps somewhat atoned for by the fact that difficulties inherent in active service conditions give even small engineering tasks a distinctive character. J.W. Hay