Page Comparison

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Notation

b_w = web width or diameter of circular section, in.
d = distance from extreme compression fiber to centroid of longitudinal tension reinforcement, in.
d_b = nominal diameter of bar, wire, or prestressing strand, in
f_y = specified yield strength of nonprestressed reinforcement,psi
f_yt = specified yield strength of transverse reinforcement, psi
h = overall thickness, height, or depth of member, in.
l_a = additional embedment length beyond centerline of support or point of inflection, in.
l_d = development length in tension of deformed bar, deformed wire, plain and deformed welded wire reinforcement, or pretensioned strand, in.
l_u = unsupported length of column or wall, in.
M_n = nominal flexural strength at section, in.-lb
s = center-to-center spacing of items, such as longitudinal reinforcement, transverse reinforcement, tendons, or anchors, in.
V_n = nominal shear strength, lb
V_u = factored shear force at section, lb
β_b = ratio of area of reinforcement cut off to total area of tension reinforcement at section.
ϕ = strength reduction factor

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Beams of Earthquake Resistant Structures

Ordinary moment frames

All the flexural reinforcement detailing described above is valid for beams of ordinary moment frames.

Beams should have a minimum of two continuous bars at the top and bottom faces.

Intermediate moment frames

All the flexural reinforcement detailing described above is valid for beams of intermediate moment frames.

Beams should have a minimum of two continuous bars at the top and bottom faces.

Special moment frames

All the flexural reinforcement detailing described above is valid for beams of special moment frames.

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• Within the joints

• Within a distance of twice the beam depth from the face of the joint

• Within a distance of twice the beam depth from critical sections where flexural yielding is likely to occur as a result of lateral displacements beyond the elastic range of behavior

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