Les propriétés élastiques de béton sous chargement bi-axial . ctc serrées à un même compte.La plaque sur le bras vertical court reposait directement sur theweighing le tableau de la machine. Le long d'une verticale:j'boreagainst blocl sphérique&Lt ; : attaché à l'pullir.g tête. Thehorizontal armes avait tour se termine comme décrit sous S. Descriptionof irhen. Tout était prêt, une série d'observationswas effectuée, comme décrit auparavant, et une augmentation de la charge. appliedslowly 15000^ accroissement est-lb. Dans tous les tests, sauf la première. Sept points ont été obtenus sur la courbe, souvent plus de sept, avec inte

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The elastic properties of concrete under bi-axial loading . clc tightened to an even bearing.The plate on the short vertical arm rested directly on theweighing table of the machine. The long vertical an:i boreagainst a spherical blocl<: attached to the pullir.g head. Thehorizontal arms had round ends as described under S. Descriptionof Apparatus. irhen all was ready, a series of observationswas made, as described before, and an increment of load appliedslowly. Tlie increment was 15000-lb. in all tests except thefirst. Seven points were obtained on the curve, often morethan seven, with increments of this size. T*ne maximum loadreached ?/as recorded after each increment. Jour or fiveminutes after the load was applied, its amount was observed andrecorded again. Headings on the expansometers vrere commonlytaXen at the time of the first obt;ervations on the gauge-lines.It was very difficult to avoid touching the collar or thethumb-screw of the expansometer while talcing readings betweengauge-holes on opposite sides of it, and the slightest touch. 73 disturbed the reading materially. To eliminate t; ic ijource oferror, readiiigs vrere taken In most of the tests both before andafter the tierles of observations. If the reading had charged, no attempt 7:as made to set the pointer to Its orlii;lnal readlnc, but the change I^as corrected in the final plotting; of the curves.On the curve sheets in the bacl^ of the thesis an expansioncurve as actually measured Is drami In full line v:hlle theadjusted curve Is dotted. Tlie reason for the adjustment Isevident from the form of the curve itself. After the maximum load, the craclcs on the specimen v:ereslietched to scale and a ohotos^aph v:as talcen of the specimen.If there 77?.s doubt as to the real maimer of failure a furtherdeforma ion irras produced and the performance of the test pieceobserved. The sketches of failures and photographs of some of thefailed specimens appear in the bacX of the boolc, 14. Phenomena of Tests a-:d Fa

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