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İnternational Design Codes

ACI 318-19 : Flexural Strength

TSC 2018 : TSC Flexural Strength

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Notation

A_{s =} area of nonprestressed longitudinal tension reinforcement, in²
α = depth of equivalent rectangular stress block, in.
b_w = web width or diameter of circular section, in.
c = distance from extreme compression fiber to neutral axis, in.
C_{c =} concretecompressive force, lb
C_{s =} reinforcement tension force, lb
d = distance from extreme compression fiber to centroid of longitudinal tension reinforcement, in.
f_c^'₌ specified compressive strength of concrete, psi
f_y = specified yield strength for nonprestressed reinforcement, psi
M_n = nominal flexural strength at section, in.-lb
ϕ = strength reduction factor
ε_t = net tensile strain in extreme layer of longitudinal tension reinforcement at nominal strength, excluding strains due to effective prestress, creep, shrinkage, and temperature
β₁ = factor relating depth of equivalent rectangular compressive stress block to depth of neutral axis

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