File:The elastic properties of concrete under bi-axial loading (1912) (14594648630).jpg

Identifier: elasticpropertie00mill (find matches)
Title: The elastic properties of concrete under bi-axial loading
Year: 1912 (1910s)
Authors: Millard, Floyd Hays
Subjects: Concrete Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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st, v/here the designsshould be strengthened and v/here they may be cut dorrn. Deformations can be measured but they mean very little tothe designer until they have been expressed in terms of stress.Consequently it is desirable to establish an exact relationbet^reen stresses and deformations of concrete bi-axially loadedand to find the similarity or difference betTireen the stress-deformation relation thus found and the relation under simpleloading. Present practice assumes the S8:ne relations ijinderbi-axial loading conditions as under simple loading, anassumption which is made for want of a better one and whichmay be far from correct. As far as can be learned, no experiments have previouslybeen made on concrete under compound stress. This pioneerinvestigation has been made to study the elementary features ofthat division of the iproblem which has to do with the design offlat plate floors. The test conditions were ideal, in that theexact nature and amount of the stresses were Icnown,
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13 The v.Titer feels that a step has been made in the rightdirection, and that additional investigations, in which theseveral variables of the problem of design are studied singly,can be made, and ^rom a sufficient number of properly plannedtests that the uncertainties v;hich are no77 so numerous may be,one by one, eliminated and that finally the design of agirderless or flat slab floor nay be as exact and as v;ellestablished as the design of a simple beam. 2> ScQ-oe of Investi.^mtion.~ The points 77hich are to be studiedin this investigation are (1) The ultimate unit deformation and the apparent initialmodulus of elasticity of concrete stressed in twodirections perpendicular to each other, and therelation of these values to the elastic propertiesof concrete stressed in one direction, (2) The safe worl^ing stress and the ultimate strengthof concrete stressed in tTro directions and the relationof these values to the worlcir:g stress and ultimatestrength of concrete stressed in one d

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