File:The elastic properties of concrete under bi-axial loading (1912) (14781570295).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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ched the expansometersto see if their movement v;as smooth and how soon after loadingthey responded to the load. The instrument on the arm respondedquickly, but the one on the cross did not tiovIi well during thetest, Por several increments of load the reading remained thesame. At a unit stress of 1200 lb. per sq.in. the crossexpansometer was disturbed and reset. Expansion readings on the cross after this indicated that the expansion on the crosswas greater than on the arm, as in the other tests of similarspecimeris. After the GOOOO-lb. load was applied and readingstaken, the vertical load was increased lo 105000-lb. and thehorizontal load increased. The flat pieces used to give freeends to the arm were so over-stressed that they yielded and thejack and side rods shifted to one side. The gauge readingindicated that no further load could be applied, and more pumpingonly served to throw the jack more out of line. The horizontalload was removed and the vertical load applied lo a maximum.
Text Appearing After Image:
78 The cradles which 7-ere noticed at the maxlmLun load opened v/ider7:hen the jpecimen was further deformed. The horizontal armcracked at its ji.mction with the cross, as shown in the sketch,and fell off. The failed specimen is shown in the photographon page 243. An inspection of the fracture sh07:ed no instances of stonecrushir-g but several cases of mortar pulling away from thestone. The surface of the specimen was pitted but the interiorwas fairly dense. 2054. This specimen and 2059 were tested to determineexpansion. Uo deformations other .han expansions were measured.The expansometers vvere on the vertical arm and on the cross,increments of load of ISOOO-lb. were applied simultaneously tothe two arms. The expansometers were read imagediately afterthe desired load v^as reached, and another increment applied.At the nominal load of SOOOO-lb. the horizontal load ras re-moved to chan^e gauges on the piimp, and the expansometers werereset after the load had been reapplied. At a vertica

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