...ultimate strength per sq. in. on test piece + 10 per cent. ft = tensile stress in pounds per sq. in. on steel. EC = modulus of elasticity of concrete. E« = modulus of elasticity of steel. E. e = = 20, as taken by Mr. Thacher. EC A = area of steel in tension for i inch in width of...

...outside fiber of concrete. /, = tensile unit stress, or pull, in steel. fs = compressive unit stress in steel. Ec = modulus of elasticity of concrete. E, = modulus of elasticity of steel n = I; d = depth from outside compressive fiber to center of gravity of stee« a = ratio of depth...

...outside fiber of concrete; /, = tensile unit stress, or pull, in steel; /', = compressive unit stress in steel; Ec = modulus of elasticity of concrete; E, = modulus of elasticity of steel; p n = -j^ = ratio of moduli of elasticity; &c d = depth from outside compressive fiber to center...