The elastic properties of concrete under bi-axial loading . upper one of each pair of plates sticking to thebottom of the beam. A roller ^7as then placed bet^veen the plates,while the specimen was thus suspended, and placed in the desiredposition of the reaction. The crosssd beam was then lowered toa bearing on the rollers. In this way it was certain thatthe distribution of the reaction across the end of the beam wasuniform that the position of the reaction was as fir^ured,A piece of 7-in. x 15-lb. I-beam about 14-in. long was set inplaster along each of the four lines where load was to b
The elastic properties of concrete under bi-axial loading . upper one of each pair of plates sticking to thebottom of the beam. A roller ^7as then placed bet^veen the plates,while the specimen was thus suspended, and placed in the desiredposition of the reaction. The crosssd beam was then lowered toa bearing on the rollers. In this way it was certain thatthe distribution of the reaction across the end of the beam wasuniform that the position of the reaction was as fir^ured,A piece of 7-in. x 15-lb. I-beam about 14-in. long was set inplaster along each of the four lines where load was to beapplied. On top of the^e pieces, two 12-in, x I-beamswere placed and these in turn loaded with a third besm of thesame size or with two side by side. This lastmentioned beam or, in the case of 2003, the two 8-in, beams,carried a plate and the dynamometer. The base of an hydraulicjaclc bore directly on top of the dynamometer, and the plur^gerof the jaclc acted on a plate on the bottom of the I-beamacross the top of the 42 Three methods of detenniniiitj the Eanount of load rere ucedIn this investigation. In the tests of compression Gpecinens, the vertical load uas applied by a testing machine and thehorizontal load v^as applied by an hydraulic iacl; and indicatedby a pressure gau^e. In the tests of crossed beams the load ^vasapplied by an hydraulic ;jaclc and indicated by a springdynamometer. In the tests of S-in. cubes the horizontal loadwas applied by an hydraulic jaclc and indicated by a spririg dyn-amometer while the vertical load was applied by a testingmachine. The testirig machine used was the 600 000-lb. Riehle, twoscrew, vertical machine in the Laboratory of Applied Iechanicsof the University of Illinois, and needs no description. The jacl^ used in compression tests and in the tests of G-in,cubes v/as a 5-l/2-in. ram rated at 100 tons. Two of thesa areshown in ?ig. 3. The jach was carefully cleaned before theexperiments and v/as in
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
