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Ag = gross area of concrete section, in2
As = area of nonprestressed longitudinal tension reinforcement, in2
Ast = total area of nonprestressed longitudinal reinforcement, in2
α = depth of equivalent rectangular stress block, in.
bw = width of compression face of member, in.
c = distance from extreme compression fiber to neutral axis, in.
Cc = concretecompressive force, lb
Cs = reinforcement tension force, lb
fc'= specified compressive strength of concrete, psi
fy = specified yield strength for nonprestressed reinforcement, psi
Pn = nominal axial compressive strength of member, lb
Pn,max = maximum nominal axial compressive strength of a member, lb
Pnt = nominal axial tensile strength of member, lb
Pnt,max = maximum nominal axial tensile strength of member, lb
P0o = nominal axial strength at zero eccentricity, lb
ϕ = strength reduction factor
εt = 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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Maximum axial compressive strength
Nominal axial compressive strength Pn is limited to a value of Pn,max in ACI Table 22.4.2.1.
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For nonprestressed concrete members, Po shall be calculated by:
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According to ACI Table 22.4.2.1 Maximum axial compressive strength for a nonprestressed concrete member with closed tie;
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The maximum compressive axial load for a nonprestressed concrete member with closed tie;
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Strength reduction factors ϕ is determined according to using ACI Table 21.2.2. Since the section is compression controlled, a ϕ factor for compression control is used.
Maximum axial tensile strength
Flexural Strength
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The distance between the fiber of maximum compressive stress and the neutral axis, c, is perpendicular to the neutral axis.
The value of β1 is determined using ACI Table 222.2.2.4.3.
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Detayları 22.2 'de var gayet açık olduğu elenecek bir şey olmadığı için sadece başını kopyaladım.
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