BLD2020-1316_Structural_Calculations_12.3.2020_7.55.17_AMWIND LOAD
WIND LOAD VARIABLES
MINIMUM ATTACHMENTS
MODULE
SIL-330 BL
GCP = (EXTERNAL PRESSURE COEFFICIENT)
GC . = 0 (ARRAY IS AN OPEN STRUCTURE)
WIDTH
39.37 in
LENGTH
66.93 in
GC = (EXTERNAL PRESSURE
COEFFICIENT) �E„aF R�=oa+To
0.8
w
AREA = L (in) * W (in) * (ftz/inz)
18.3 ft'
VELOCITY PRESSURE
P = qh * (GCP - (GC i = 0))
29.49 psf
o
Kz = (HEIGHT AND EXPOSURE)
0.7
N = (NUMBER OF MODULES)
17
0
Kn = (SPEED UP FACTOR)
2.00
F, = P * A * N 9173 psf
it
Kd = (WIND DIRECTIONALITY)
0.85 MPH
Mi _ (NUMBER OF STANDOFFS) g
V = (BASIC WIND SPEED)
110 MPH
I = (IMPORTANCE CATEGORY)
11:1.00
GC =
-1.2
qh = 0.00256 * Kz * Kzt *Kd* V * 1
36.86 psf
P = qh * (GCP - 0)
44.23 psf
0
DESIGN UPLIFT
N = (NUMBER OF MODULES)
17
N
ATTACHMENT TYPE
Lag Bolt
5/16" LAG BOLT
F2 = P * A * N 13760 psf
o
F = (DESIGN UPLIFT LOAD)
532 Ibs/attachment
M2 = (NUMBER OF STANDOFFS) 15
Q:
FORCE PER ATTACHMENT
MTOTAL = M1 + M2 + M3
27
GC =
-2.0
M
FTorAL _ (Fi + F2 + Fs) / MTOTAL
475 Ibs/attachment
P = qh * (GCP - 0)
73.72 psf
o
SAFETY FACTOR
k;�ACTOR,
N = (NUMBER OF MODULES)
2
LL
F3 = P * A * N 2698 psf
p
O
FIFTOTAL > 1.0 2.24 > 1.0 OK
M3 = (NUMBER OF STANDOFFS) 3
of
5 MODUL
6 STAND(
5 MODUL
6 STAND(
6"
4 MODULES
4STANDOFF:
4 MODULES
4STANDOFF:
A MINIMUM OF 27 STANDOFFS REQUIRED
WITH 2 ATTACHMENT(S) PER STANDOFF(S) WITH 2.0" DEPTH OF LAG IN DOUGLAS FIR
ATTACHMENT LAYOUT
2:12 ROOF LAYOUT
8FT SPAN DOMINATED SPACING
IRONRIDGE XR1000
42 ATTACHMENTS
DIMENSIONS TO THE NEAREST HALF INCH
z< :1
WEIGHT LOAD
QUANTITY
WEIGHT (Ibs)
TOTAL (Ibs)
MODULES
36
42.99
1547.64
STANDOFFS
42
1.21
50.99
RAIL LINEAR FT
255
1.01
256.21
END CLAMP
28
0.05
1.40
MID CLAMP
58
0.08
4.64
MICROINVERTERS
36
2.38
85.68
TOTAL
1946.56
WEIGHT LOAD = Ibs / = TOTAL Ibs / (AREA * N) 1 2.95
TOTAL WEIGHT LOAD OF SOLAR EQUIPMENT IS 2.95 Ibs / ft2
WEIGHT LOAD NOTES:
TOTAL NUMBER OF ATTACHMENTS IN SYSTEM IS DICTATED
BY WIND LOAD REQUIREMENTS OR BY MAXIMUM SPAN
REQUIREMENTS OF RAIL MANUFACTURER, WHICHEVER IS
GREATER.
MINIMUM ATTACHMENTS PER WIND LOAD: 27
MINIMUM ATTACHMENTS PER SPAN OF 8ft: 42
NUMBER OF ATTACHMENTS REQUIRED: 42
6 MODULES 3 MODULES
6 STANDOFFS 6 STANDOFFS
PUGET SOUND SOLAR
805 Rainier Ave S
Seattle, WA 98144
Tel: 206-706-1931
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0 PRELIMINARY DESIGN 11/30/20
REV DESCRIPTION DATE
DRAWN BY LA
CHECKED BY AL
SOLAR NEXUS #: 12612
SALES: JEFF PERAMBO
PM: BILL ULSUND
WIND AND WEIGHT
LOAD CALCULATIONS
PV-103