1 foot = 0.305m
Lower sloped roof areas
Center of mass:
Element
Weight
x
y
Wx
Wy
(kips)
(ft.)
(ft.)
(kip*ft)
(kip*ft)
Roof Deck
15.2
45.0
4.8
683.1
73.4
Wall A2-A7
42.8
45.0
9.7
1923.8
413.4
Wall B2-B7
38.0
45.0
0.0
1711.1
0.0
Wall 2A-2B
6.2
0.0
4.8
0.0
30.0
Wall 7A-7B
6.2
90.0
4.8
558.0
30.0
Σ=
108.4
4876.0
546.7
∑ Wx / ∑ w
cm =
cmx = (4876) / (108.4) = 45'(13.73m)
cmy = (546.7) / (108.4) = 5.04'(1.54m)
Center of rigidity
The rigidity of shear wall lines A and I must be calculated;
H3-33
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