The elastic properties of concrete under bi-axial loading . perpendicular lo each other and at200 lb. per is or of the deformationwhich would occur at this stres. under simple loadirjg. ^^e shouldexpect the initial modulus of elasticity to be increased to1 or times the value obtained under simple loading. The value of , obtained by drawing:; tangents to .hestress-deformation curves, agrees with the above conclusion. The same discrepancy between the values of the modulus ofelasticity obtained from the control cylinder and from the armof a crossed beam is not
The elastic properties of concrete under bi-axial loading . perpendicular lo each other and at200 lb. per is or of the deformationwhich would occur at this stres. under simple loadirjg. ^^e shouldexpect the initial modulus of elasticity to be increased to1 or times the value obtained under simple loading. The value of , obtained by drawing:; tangents to .hestress-deformation curves, agrees with the above conclusion. The same discrepancy between the values of the modulus ofelasticity obtained from the control cylinder and from the armof a crossed beam is noticed as v;as noticed with compressionspecimens. The position in which the specimens were made andthe conditions of storage may be significant. 19. Effect of Test Conditions .-The cro::sed beams were designedto fail in compression, and the deformation indicates that ahigh compressive stress was developed although the beams actuallyfailed in diagonal tension. The effect of the shape of specimenis not as well established for crossed beams as for compression. 1Z9 specimens oecause no tests v/ere made on crossed beains restingon two supports. The distribution of deformation over the crossof the specimen was so similar to the distribution on a compres-sion specimen, both in form and In the distance from the crossto v;hich deformation was transferred, and the part of the loadcarried by the cross, as indicated by the area under the curveshowing the distribution of defomiation, was so nearly the sameon the crossed beam as on the compression specimen that exactlysimilar methods of eliminating the shape of the specimen itself have been used. Tlie same methodo have been applied to eliminatethe effect of section on the modulus of elasticity. As wdiS done in the discussion of compression specimens,the final results have been stated in terms which do not dependat all on the shape of the test piece. The effect of the shapeof test piece has been eliminated. The remarlcable agreement of the resu
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
