The elastic properties of concrete under bi-axial loading . Intersecting arm, and no craclcs werefound on the short arms. A load of 90000-lu. was applied withthe testirig machine but it rapidly fell off, and before observa-tions could be made the craclcs mentioned above were after failure, the loads were removed and the craclcsslcetched. The specimen was again loaded ?7lth 60000-lb. In thehorizontal direction and 70000-lb. in the vertical long horizontal arm crushed badly, followed by the upperpart of the vertical arm, and then the whole test piece splitapart t
The elastic properties of concrete under bi-axial loading . Intersecting arm, and no craclcs werefound on the short arms. A load of 90000-lu. was applied withthe testirig machine but it rapidly fell off, and before observa-tions could be made the craclcs mentioned above were after failure, the loads were removed and the craclcsslcetched. The specimen was again loaded ?7lth 60000-lb. In thehorizontal direction and 70000-lb. in the vertical long horizontal arm crushed badly, followed by the upperpart of the vertical arm, and then the whole test piece splitapart through the cross in a plane containing both loads. This^ould seem to indicate that while the deformation on the crosswas not as great as on the arm, the concrete was neverthelessin a critical condition and was about to fail by tension due toexpansion perpendicular to the plane of the two loads. Thecharacter of the fracture 7 the same on the arms as on thecross. It is noticeable that the expansion on the eross isabout twice as great as that on the 7G 20^. The expansometorc v;ere on the horizontal arm and onthe cross. Increments of load of 15000-lb. Yi^Te applied asbefore. At 90000-lb. a crack was observed on the horizontalarm rtu^nir^ throu£jh the expansometer collar. Hiile the nextload \7as being applied Ihis craclc opened rapidly, aiid theexpansometer was removed. At 105000-lb. a crack 77as observedIn the bearing plate on the horizontal arm. Possibly thisaccounts for the formation of the crack and the rapid expansionat a load of 90000-lb. -^en the load rras increased to lOSOOO-lb,the split plate broke with a report and a considerable portionof the horizontal arm fell off. This is shown by the shadlr-gin the sketch on page 238. l?Jhlle the vertical load remained,observations were made on some of the gaioge-lines to determinethe effect on the deformation at the cross of removing thehorizontal load,- This effect is shovm by the dotted lines onthe stress-deformation cur
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
