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Bulkhead Design <br /> Page 7 <br /> <br /> Flexure Notation Summary: <br /> a = depth of equivalent rectangular stress block. <br /> A = area of tension reinforcement (sq in). <br /> s <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' =specified compressive strength of concrete (psi). <br /> c <br /> fs = calculated stress in reinforcement at service loads. <br /> f = specified yield strength of reinforcement (psi). <br /> y <br /> h = total depth or thickness of member. <br /> M, = theoretical moment strength of section (in-lb). <br />• l <br /> M = app <br />ied design moment at a section. <br /> u <br /> T = sum of tensile stresses in the reinforcement. <br /> l', = 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 /> a = ratio tension reinforcement = A <br />/bd <br /> s <br /> -~ = reinforcement ratio producing balanced conditions. <br /> .-?,,, =maximum reinforcement ratio = 0.75 <br /> ,~,., =minimum reinforcement ratio = 200/ <br /> © = capacity reduction factor. <br /> ' /,~c <br /> <br />