Tests of reinforced concrete beams : modulus of elasticity for various ages and mixtures . educes to,n » ~(l^k)and for g = 1/2 it reduces to, n = k2 ) By means of these equations and taking the nodultis of elas-ticity of steel as 30,000,000 pounds per square inch the modu-lus of elasticity of concrete was oht^ IN STEEL: The stress in the steel v/as found both by means of thedeformation of the steel and by means of the resisting the first method: S = Egeg, where, s a Unit tensile stress in modulus of elasticity of unit deformation in s
Tests of reinforced concrete beams : modulus of elasticity for various ages and mixtures . educes to,n » ~(l^k)and for g = 1/2 it reduces to, n = k2 ) By means of these equations and taking the nodultis of elas-ticity of steel as 30,000,000 pounds per square inch the modu-lus of elasticity of concrete was oht^ IN STEEL: The stress in the steel v/as found both by means of thedeformation of the steel and by means of the resisting the first method: S = Egeg, where, s a Unit tensile stress in modulus of elasticity of unit deformation in the second method: ^^SJ^^ltm^ The internal resisting moment V / of a beam must equal the external moment. The internal bending momentequals the stress in the steel timesits moment arm. This moment arm isd of Pig. 1. Prom Bulletin ITo. 4,previously referred to, approximatelythis distance, d - d() where, d = moment arm of resisting couple,d = effective depth of beam = distance from plan©of upper face to plane of center of , the internal , M = Sd (),. 6. where, M z internal bending moment. S m total stress In steel. The external being moment, M = 4 X 12 X W = 24¥, 2 where, W « applied load in poimds. Therefore, as M = K, Sd () rr 24W, or S 24W STRESS m CONCRETE: Prom Bulletin No. 4 of the University of IllinoisEngineering Experiment Station the compressive stress at theTapper fiber. c -= stress at upper fiber,p - percent of reinforcement,f = stress in steel. k s ratio of distance between compressive face and neutral axis to distance = ratio of deformation existing in most remote fiber to ultimate deformation. ctestsofreinforce00bear
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