526 STRUCTURAL MECHANICS. CHAP. XVI. 



REINFORCED CONCRETE NOMENCLATURE. Rectangular Beams, Reinforced for 

 Tension Only. 



/, = tensile unit stress in steel, in pounds per square inch. 



f e = compressive unit stress in concrete, in pounds per square inch. 

 E, = modulus of elasticity of steel, in pounds per square inch. 

 E e modulus of elasticity of concrete, in pounds per square inch. 



n = elasticity ratio, E, -5- E c . 

 M = bending moment, in inch-pounds. 

 M, = moment of resistance of steel, in inch-pounds. 

 M e = moment of resistance of concrete, in inch-pounds. 

 A = area of steel section, in square inches. 



b = width of beam, in inches. 



d depth of beam to center of steel reinforcement, in inches. 



k = ratio of depth of neutral axis to effective depth, d. 



j = ratio of arm of resisting couple to depth, d. 



p = steel ratio (not percentage), A - bd. 



C = total compressive stress in concrete, in pounds. 



T = total tensile stress in steel, in pounds. 

 Tee Beams. 



b width of flange, in inches. 

 b' = width of stem, in inches. 



/ = thickness of flange, in inches. 



p = steel ratio (not percentage), A -5- bd. 

 See also " Rectangular Beams Reinforced for Tension Only." 

 Rectangular Beams, Reinforced for Compression. 

 A' = area, of compressive steel, in square inches. 

 p' = steel ratio for compressive steel, A ' -f- bd. 

 f s ' = unit compressive stress in steel, in pounds per square inch. 



C total compressive stress in concrete, in pounds. 

 C' = total compressive stress in steel, in pounds. 



T = total tensile stress in steel, in pounds. 



d' = depth to center of compressive steel, in inches. 



2 = depth to resultant of compressive stresses, in inches. 

 See also " Rectangular Beams Reinforced for Tension Only." 

 Shear and Bond. 



V = total shear in pounds. 



/ = unit shearing stress in concrete, in pounds per square inch. 

 / = unit bonding stress in concrete, in pounds per square inch. 

 2o = sum of the perimeters of the tension bars, in inches. 



s = horizontal spacing of stirrups. 

 P = total stress carried by one stirrup. 

 Columns. 



A = total net area, in square inches. 

 A, = area of longitudinal steel, in square inches. 

 A e = area of concrete, in square inches. 



p steel ratio, A s -f- A. 



P = total axial load, in pounds. 



