Transverse direction:
LOWER SLOPED ROOF @ ENTRANCE TRIBUTARY SEISMIC WEIGHTS (ROOF & NORMAL WALLS)
Item
Tributary
Length /
% Solid
Area
Unit Weight
Seismic Weight
Height / Width
Width
(ft.2)
(psf / lb)
(kips)
(ft.)
(ft.)
LOWER ROOF
Roof D1-F2
10.0
24.0
100.0
240.0
13.7
3.3
LONGITUDINAL WALLS
Wall D1-D2
8.0
10.0
100.0
80.0
100.0
8.0
Wall F1-F2
8.0
10.0
100.0
80.0
100.0
8.0
TOTAL
19.3
Total weight = 19.3 kips
Seismic coefficient, C = 0.167
85.8 KN
Seismic force = CsW = (0.167)(19.3) = 3.22 kips (14.3 KN)
Equivalent Running Load w = 3.22 k / 10 ft. = 322 plf (4.70 KN/m)
-
Shear force to shear wall line 1 from entrance roof
V = wL/2 = (322)(5' = 1.61 kips (7.16 KN)
)
-
Shear force to wall line 2 (same as wall line 1 due to symmetry)
V = 1.61 kips (assume goes to 2A-2D and to 2F-2I = 0.805 (3.58 KN))
The shear walls along grid line 1 must also resist the forces associated with their self-weight. Wall line 2
has no seismic weight tributary to the entrance roof.
Weight of wall line 1 tributary to the entrance roof = 16.0 kips
Self-weight inertial force = CsW = (0.167)(16.0) = 2.67 kips (11.88 KN)
Total shear to wall line 1 tributary to entrance roof diaphragm = (1.61 k) + (2.67 k) = 4.3 k (19.1 KN)
1 kip = 4.448 KN
1 plf = 14.59 N/m
H3-26
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