The modal period of vibration (sec) of the mth
∆d
Tm
Diaphragm displacement, in a one-story building
mode of the building as determined in paragraph
with a flexible diaphragm, due to a lateral load
3-2c.
equal to the weight of the building (in. or mm).
t
Thickness of the web of a diaphragm in Equation
∆w
5-12 and 5-13 (in. or mm).
In-plane wall displacement in a one-story building
with a flexible diaphragm, due to a lateral load
t1
Thickness of flat sheet element in a steel deck
equal to the weight of the building (in or mm).
diaphragm (in or mm).
∆w
Web component of diaphragm deflection (in. or
1
mm).
t2
Effective thickness of fluted element in a steel
deck diaphragm (in. or mm).
δem
The modal of Level x at the center of the mass at
x
and above Level x determined by an elastic
tw
Thickness of wall web (in. or mm).
analysis, paragraph 3-2c (in or mm).
Vm
The portion of the base shear contributed by the
δm, δm The modal deflection of Level x at the center of
mth mode (kips or K-N).
x
x
the mass at and above Level x as determined by
Equation 3-21 (in or mm).
Vme
The expected vertical nominal shear strength in a
non-special segment of a truss moment frame (kips
φ
Resistance factor.
or K-N).
φim
Vs
Shear strength of the link beam in an eccentric
The displacement amplitude at the ith level of the
braced frame (kips or K-N).
building for the fixed base condition when
vibrating in its mth mode, Paragraph 3-2c.
Vs
Shear strength provided by shear reinforcement (lb
or N).
φxm
The displacement amplitude at the xth level of the
structure when vibrating in its mth model
Vu
Required shear strength (lb or N) due to factored
loads in paragraph 5-5b(2)(c).
ρg
Ratio of area of total wall or pier reinforcement to
area of gross section.
vs
Average shear wave velocity in top 100 ft (30 m);
see Table 3-1 (fps or mps).
∑ M*pb Moment at the intersection of the beam and
column centerlines determined by projecting the
W
Uniformly distributed load on a diaphragm in
beam maximum developed moment from the
Equation 5-10 (lbs. or N).
column face in paragraph 5-5 (c)(7)
(in-lb or N-mm).
Wm
The effective modal gravity load determined in
accordance with Equation 3-15 (kip or kN).
∑ M*pc Moment at intersection of the beam and column
centerline determined by projecting the sum of the
w
Moisture content (in percent), ASTM D2216-92.
nominal column plastic moment strengths,
induced by the axial stress, Puc/Ag, from the top
w
Unit weight of concrete in Equation 5-13
and bottom of the beam moment connection in
(lbs/cu ft or N/m3).
paragraph 5-5(c)(7) (in-lb or N-mm).
wi, wx
The portion of the total gravity load, W, located or
assigned to Level i or x (kip or kN).
Plastic section modules of a member (in3 or mm3).
Ζ
α
A form factor in Equation 5-10 and 5-12.
∆
The design story drift as determined in Section
5.3.8.1 of NEHRP 97 (in. or mm).
B-3
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