Therefore, the moment frame cross sections are as follows;
Columns:
Beams:
1-in = 25.4mm
Building weights are calculated on spread sheet and are shown in figures 3, and 4.
Total seismic weight is;
W = 4,428k (19.70MN)
B-3 Calculate Base Shear, V:
V = CsW
(EQ. 5.3.2 FEMA 302)
where;
S DS
Cs =
(EQ. 3-7)
R
and,
SD1
Cs <
(EQ. 3-8)
TR
Cs > 0.044S DS
(EQ. 3-9)
Transverse direction;
S
0.93
Cs,trans = DS =
= 0.17
R
5.5
S
0.50
= D1
Cs,trans = 0.17 < 0.33 =
0.28(5.5) TR
Cs,trans = 0.17 > 0.041 = 0.044(0.93) = 0.044SDS
Therefore, Vtrans = CsW = 0.17(4,428k) = 753k (3.35MN)
Longitudinal direction;
S
0.93
Cs,long = DS =
= 0.12
R
8
S
0.50
= D1
Cs,long = 0.12 < 0.15 =
0.41(8) TR
Cs,long = 0.12 > 0.041 = 0.044(0.93) = 0.044SDS
Therefore, Vlong = CsW = 0.12(4,428k) = 531k (2.36MN)
Vtrans = 753k (3.35MN), Vlong = 531k (2.36MN)
H2-17
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