File:The elastic properties of concrete under bi-axial loading (1912) (14594918838).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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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
Text Appearing After Image:
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 Failure of Com-oression ST>ecimens.The phenomena of tests a

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