HomeMy WebLinkAboutAPPROVED Structural - 122617_ Beedham, CarolynAttn.: To Whom It May Concern
re job:
The following calculations are for the structural engineering design of the photovoltaic panels and are valid
only for the structural info referenced in the stamped plan set. The verification of such info is the
responsibility of others.
All mounting equipment shall be designed and installed per manufacturer's approved installation
specifications.
Design Criteria:
Current Renewables Engineering Inc.
Professional Engineer
info@currentrenewableseng.com
03-10-2022
Freedom Forever LLC
43445 Business Park Dr Suite 110, Temecula, CA 92590
Beedham, Carolyn
7806 Santa Rosa Pkwy, Fort Pierce, FL 34951, USA
I certify that the roof structure has sufficient structural capacity for the applied PV loads.
Code: 2020 FBC, ASCE 7-16,
Live Load: 20 psf
Ult Wind Speed: 157 mph
Exposure Cat: C
Ground Snow: 0 psf
Min Snow Roof: 0 psf
1960 Chicago Ave Suite D15, Riverside, CA 92507 (951) 405-1733info@currentrenewableseng.com
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Roof Properties:
Roof Type =
Roof Pitch (deg) =
Mean Root Height (ft) =
Attachment Trib Width (ft) =
Attachment Spacing (ft) =
Framing Type =
Framing Size =
Framing OC Spacing (in.) =
Section Thickness, b (in) =
Section Depth, d (in) =
Section Modulus, Sx (in3) =
Moment of Inertia, lx (in4) =
Upper Chord Length (ft) = Framing Span (ft) =
Deflection Limit D+L (in) =
Deflection Limit S or W (in) =
Attachments Pattern =
Framing Upgrade =
Sister Size =
Wood Species =
Wood Fb (psi) =
Wood Fv (psi) =
Wood E (psi) =
CD (wind) =
Cd (snow) =
CLS =
CM = Ct = CL = Ci =
CF =
Cfu =
Cr =
F'b wind (psi) =
F'b snow (psi) =
F'v wind (psi) =
F'v snow (psi) =
M allowable wind (lb-ft) =
M allowable snow (lb-ft) =
V allowable wind (lbs) =
V allowable snow (lbs) =
E' (psi) =
Moment of Inertia, lx (in ) =
Unsupported Span (ft) =
Shingle
18.0
13.0
3.3
4.0
Truss
2x4
24.0
1.5
3.5
3.062
5.359
8.0
3.02
2.013
Fully Staggered
No
NA
DF
900.0
180.0
1600000.0
1.6
1.15
1.0
1.0
1.5
1.0
1.15
2484.0
1785.37
288.0
207.0
633.94
455.64
1008.0
724.5
Roof 1
1600000.0
15.1
Beedham, Carolyn
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Load Calculation:
Dead Load Calculations:
Ultimate Wind Speed (mph) =
Directionality Facto r, kd =
Topographic Factor, kzt =
Velocity Press Exp Factor, kz =
Velocity Pressure, qz (psf) =
External Pressure Up, GCp_1 =
External Pressure Up, GCp_2 =
External Pressure Up, GCp_3 =
External Pressure Down, GCp =
Design Pressure Up, p_1 (psf) =
Design Pressure Up, p_2 (psf) =
Design Pressure Up, p_3 (psf) =
Design Pressure Down, p (psf) =
Panels Dead Load (psf) =
Roofing Weight (psf) =
Decking Weight (psf) =
Framing Weight (psf) =
Misc. Additional Weight (psf) =
Existing Dead Load (psf) =
Total Dead Load (psf) =
Wind Load Calculations:
Ground Snow Load, pg (psf) =
Min Flat Snow, pf_min (psf) =
Sloped Snow, ps_min (psf) =
Snow Importance Factor, Ic =
Exposure Factor, Ce =
Thermal Factor, Ct =
Flat Roof Snow, pf (psf) =
Slope Factor, Cs =
Sloped Roof Snow, ps (psf) =
Snow Load Calculations:
3.0
3.0
2.0
0.602
1.0
6.602
9.602
156.683
0.85
1.0
0.849
45.347
-2.0
-2.569
-3.058
0.465
-77.044
-98.975
-117.805
17.896
Roof 1
0.0
0.0
0.0
1.0
0.9
1.2
0.0
1.0
0.0
Beedham, Carolyn
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Roof Framing Checks:
LC1: D+S
Force Checks:
Applied Moment (lb-ft) =
Applied Shear (lbs) =
Allowable Moment (lb-ft) =
Allowable Shear (lbs) =
Moment DCR =
Shear DCR =
Hardware Checks:
LC2: D+0.6W
Applied Moment (lb-ft) =
Applied Shear (lbs) =
Allowable Moment (lb-ft) =
Allowable Shear (lbs) =
Moment DCR =
Shear DCR =
Ref. Withdrawal Value, W (lb/in) =
(Cm = Ct = Ceg = 1.0) CD =
Adjusted Withdrawal Value, W' (lb/in) =
Lag Penetration, p (in.) =
Allowable Withdrawal Force, W'p (lbs) =
Applied Uplift Force (lbs) =
Uplift DCR =
Ref. Lateral Value, Z (lbs) =
(Cm = Ct = CΔ = Ceg = 1.0) CD =
Adjusted Lateral Value, Z' (lbs) =
Applied Lateral Force (lbs) =
Angle of Resultant Force, α (deg) =
Adjusted Interaction Lateral Value, Z'α (lbs) =
Lateral DCR =
138.328
93.368
455.643
724.5
0.304
0.129
Roof 1
Roof 1
570.863
385.321
633.938
1008.0
0.901
0.382
266.0
0.9
243.0
12.237
1.557
1063.362
0.012
266.0
1.6
425.6
2.5
1064.0
-918.061
0.863
Beedham, Carolyn
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LC2: S
LC3: W (Down)
Deflection Checks (Service Level):
LC1: D+L
LC4: W (Up)
Deflection (in.) =
Deflection Limit (in.) =
Deflection DCR =
Deflection (in.) =
Deflection Limit (in.) =
Deflection DCR =
Deflection (in.) =
Deflection Limit (in.) =
Deflection DCR =
Deflection (in.) =
Deflection Limit (in.) =
Deflection DCR =
LC3: D+0.75(S+0.6W)
LC4: 0.6D+0.6W
Applied Moment (lb-ft) =
Applied Shear (lbs) =
Allowable Moment (lb-ft) =
Allowable Shear (lbs) =
Moment DCR =
Shear DCR =
Applied Moment (lb-ft) =
Applied Shear (lbs) =
Allowable Moment (lb-ft) =
Allowable Shear (lbs) =
Moment DCR =
Shear DCR =
0.407
3.02
0.135
0.0
2.013
0.0
0.077
2.013
0.038
0.33
2.013
0.164
404.371
272.942
633.938
1008.0
0.638
0.271
608.906
410.999
633.938
1008.0
0.961
0.408
Beedham, Carolyn
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(Existing W + Additional W)/(Existing W) =
Weight Increase:
Existing Weight:
Total Additional PV Weight (lbs) =
Seismic Check:
The increase in weight as a result of the solar system is less than 10% of the existing structure and therefore
no further seismic analysis is required.
Wall Weight (psf) =
Tributary Wall Area (ft2) =
Total Wall Weight (lbs) =
Roof Weight (psf) =
Roof Area (ft2) =
Total Roof Weight (lbs) =
Total Existing Weight (lbs) =
17.0
940.0
15980.0
6.602
1984.0
13097.5
29077.5
2059.2
1.071
Beedham, Carolyn
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Limits of Scope of Work and Liability:
Existing structure is assumed to have been designed and constructed following appropriate codes at
time of erection, and assumed to have appropriate permits. The calculations produced are only for the
roof framing supporting the proposed PV installation referenced in the stamped planset and were
completed according to generally recognized structural analysis standards and procedures, professional
engineering and design experience, opinions and judgements. Existing deficiencies which are unknown or
were not observable during time of inspection are not included in this scope of work. All PV modules,
racking, and mounting equipment shall be designed and installed per manufacturer's approved
installation specifications. The Engineer of Record and the engineering consulting firm assume no
responsibility for misuse or improper installation. This analysis is not stamped for water leakage.
Framing was determined based on information in provided plans and/or photos, along with engineering
judgement. Prior to commencement of work, the contractor shall verify the framing sizes, spacings, and
spans noted in the stamped plans, calculations, and cert letter (where applicable) and notify the
Engineer of Record of any discrepancies prior to starting construction. Contractor shall also verify that
there is no damaged framing that was not addressed in stamped plans, calculations, and cert letter
(where applicable) and notify the Engineer of Record of any concerns prior to starting construction.
Beedham, Carolyn