APPENDIX B
Fpx
The resultant of the diaphragm load acting
through the center of mass (kips or K-N).
SYMBOLS AND NOTATIONS
Ft
The force on an individual vertical resisting
Area of nonprestressed tension reinforcement (in.2
AS
element due to a torsional moment Mt
or mm2).
(kips or K-N).
Area of compression reinforcement (in.2 or mm2).
A'
S
Fv
Velocity-based site coefficient (at 1.0 sec period).
Gross cross-sectional area (in.2or mm2).
Ag
Fxm
The portion of the seismic base shear, Vm, induced
at level x as determined in paragraph 3-2c.
Aw
Area of the diaphragm web in Equations 5-10 and
5-11 (in.2 or mm2).
Fy
Specified yield strength of structural steel
(psi or MPa).
a
Angle of the diagonal members with the
horizontal plane in the special segment of a truss
Fye
Expected yield strength of structural steel
moment frame (degrees or radians).
(psi or MPa).
aw
Spacing of marginal welds in steel deck
fa
Axial stress in a structural member (psi or MPa).
diaphragm in Equation 5-14 (ft or m).
fae
Expected vertical compressive stress (psi or MPa).
bf
Flange width of structural steel beam (in. or mm).
fme
Expected compressive strength of masonry as
b/t
Ratio of flange width to flange thickness for
determined in Section 7.3.2.1 (psi or MPa).
structural steel beams.
Shear modulus (lb/in.2 or MPa).
G
Cd
The deflection amplification factor as given in
Table 7-2.
H
Thickness of soil (ft. or m).
Cs
The seismic response coefficient (dimensionless)
heff
Height to resultant of lateral force for wall or pier
determined in paragraph 3-2c.
(in. or mm).
Csm
The modal seismic response coefficient
K
Stiffness of a vertical resisting element in
(dimensionless) determined in paragraph 3-2c.
paragraph 5-9b(3)(d) (kips/in. or K-N/mm).
The vertical distribution factor in the mth mode.
Cvxm
LI
Distance from adjacent vertical resisting element
(i.e. such as a shear wall) and the point at which
cm
Center of mass.
the deflection is to be determined (ft or m).
cr
Center of rigidity.
L
Length of wall (in. or mm).
d
Distance of a vertical resisting element from the
L
single span length of a diaphragm in Equation 5-
center of rigidity in a torsional analyses
10 (ft or m).
(in. or mm).
L
Span length of truss in a truss moment frame
EI
Flexural elastic stiffness of the chord member of
(in. or mm).
the special segment of a truss moment frame
(kips - in.2 or (N-mm2).
Lp
Limiting laterally unbraced length for full plastic
flexural strength, uniform moment case
F
Flexibility factor in paragraph 5-9b(4)(b)
(in. or mm).
(micro in./ft, or mm/m).
Ls
0.9 times the length of the special segment in a
Fa
Acceleration-based site coefficient
truss moment frame (in. or mm).
(at 0.3 sec period).
B-1
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