Tests on plain and reinforced concrete beams . 20 7 ^ /^x733^ 37^ 37^ Hodulu^ oi Huplvre of Concrete. IV(?/^/pf per //. // /7/ 26> 0 0 // /7/ 3/2 25 /?/ ^3 5 5 334 24 2C> /V/. 6 S Soo 3a 355 3/ 34 / 347:.^ Tiaeoe resultgive fairly uniform values for the modulusof rupture except with No. 24. Neglecting No. 24 , the averagevalue is 350 Ih, per sq. in. The weight of the beam per linealfoot was assumed in all cases except No. 26 and No. 30, butprobahly the true value lies very close to the assumed valuesince in all cases where the beams were weighed, the weight ofthe concrete per cubic foot
Tests on plain and reinforced concrete beams . 20 7 ^ /^x733^ 37^ 37^ Hodulu^ oi Huplvre of Concrete. IV(?/^/pf per //. // /7/ 26> 0 0 // /7/ 3/2 25 /?/ ^3 5 5 334 24 2C> /V/. 6 S Soo 3a 355 3/ 34 / 347:.^ Tiaeoe resultgive fairly uniform values for the modulusof rupture except with No. 24. Neglecting No. 24 , the averagevalue is 350 Ih, per sq. in. The weight of the beam per linealfoot was assumed in all cases except No. 26 and No. 30, butprobahly the true value lies very close to the assumed valuesince in all cases where the beams were weighed, the weight ofthe concrete per cubic foot was about 151 lb. In general the. 21. value of the modulus of rupture seemn to be independent of thelength of the beam, thuc proving that for all ordinary computa-tions, the ordinary formulas for simple beams of uniform cross-section are sufficiently accurate. In determinin.]; the coefficient of elasticit^r t^Ao methodswill be used, (l) by substituting the value of the deflections inthe equation of the deflection of the elastic curve, and (2) by jderiving the coefficient from the deformation measured in theextreme fibre. The values of the deflections are scaled fromthe plotted deflection curves and the deformations are scaledfrom th:^ curve lying intermediate between the curves for ex-tension of lov;er fibre and contraction of upper fibre. Thedeformations and deflections due to the weight of the beam arenot considered since all readings are taken as zero at the pointof no applied load. The equation of the elastic curve for points between loadsis derived ) To 7^/?^ /e/f / //p^ Z^^^-
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttheses, bookyear1904
