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Bulkhead Design <br />Page 7 <br />Flexure Notation Summary: <br />a = depth of equivalent rectangular stress block. <br />As = area of tension reinforcement (sq in). <br />b = width of compression face of member. <br />c = distance from extreme compression fiber to neutral axis. <br />C = sum of compressive stresses in the concrete. <br />f = effective depth, the distance from extreme compression fiber to <br />centroid of tension reinforcement. <br />f'c =specified compressive strength of concrete (psi). <br />fs = calculated stress in reinforcement at service loads. <br />fy = specified yield strength of reinforcement (psi). <br />h = total depth or thickness of member. <br />M, = theoretical moment strength of section (in-lb). <br />Mu = applied design moment at a section. <br />T = sum of tensile stresses in the reinforcement. <br />~~>, = a coefficient relating the depth of the rectangular stress block to <br />the depth from the compression face to the neutral axis, a = x c. <br />= ratio . tension reinforcement = As/bd <br />. s = reinforcement ratio producing balanced conditions. <br />-~.~, =maximum reinforcement ratio = 0.75 <br />,;,., =minimum reinforcement ratio = 200/ <br />~~ = capacity reduction factor. <br />~, <br />' ~."c <br />