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Wind Load Report

1. Site & Building Data

Roof Type: Gable  
Wind Speed (ult): 105 mph
Exposure Category: C  
Enclosure Class: Enclosed  
Building Width (W): 40 ft.
Building Length (L): 30 ft.
Eave Height (he): 11 ft.
Foundation Height (hf): 0 ft.
Roof Pitch: 8 /12
Eave Overhang (OHe): 1 ft.
Gable Overhang (OHg): 1 ft.

2. Parameters & Coefficients

Topographic Factor (Kzt): 1.0
Directionality Factor (Kd): .85
Roof Angle (θ): 33.69 deg.
Mean Roof Height (h): 17.67 ft.
Ridge Height (hr): 24.33 ft.
Pos. Internal Pressure (+GCpi): +0.18  
Neg. Internal Pressure (-GCpi): -0.18  
Velocity Pressure Exp. Coeff. (Kh): 0.88 @ z=h
Velocity Pressure (qh): 21.08 psf
End Zone Width (a): 3.00 ft.
Zone 2/2E Dist.: 20.00 ft.

3. Design Assumptions and Notes

Code Standard: ASCE 7-10
Geometry: Regular-Shaped Bldg.
Height Class: Low-Rise Building
Notes:

4. Design Loads

Top Chord Dead Load: 7 psf
Bottom Chord Dead Load: 10 psf
Truss/Rafter Spacing: 24 in. o/c

4. Design Wind Pressures: MWFRS Envelope Procedure


Load Case A: Transverse Direction
Surface GCpf Design Pressure (psf)
(w/ +GCpi) (w/ -GCpi)
1 0.56 8.01 15.60
2 0.21 0.63 8.22
3 -0.43 -12.86 -5.27
4 -0.37 -11.59 -4.00
1E 0.69 10.75 18.34
2E 0.27 1.90 9.49
3E -0.53 -14.97 -7.38
4E -0.48 -13.91 -6.32
2OH 0.21 4.43
2EOH 0.27 5.69
3OH -0.43 -9.06
3EOH -0.53 -11.17
2OH+W 0.21/-0.7 -9.83
2EOH+W 0.27/-0.7 -8.56
a) (+) and (-) signs signify wind pressures acting toward & away from surfaces.
b) External Pressure Coefficients linearly interpolated from Fig. 28.4-1 ASCE 7-10.
c) Design building for all wind directions, 4 load patterns per load case.
d) Total horizontal shear shall not be less than that by neglecting roof wind forces.
e) Min. wind load for enclosed or partially enclosed bldg.: 16 psf wall, 8 psf roof.
f) Design pressures are for strength design, multiply by 0.6 for ASD.
Wind Loads 2024D400
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
11/25/2024 1
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Load Case B: Longitudinal Direction
Surface GCpf Design Pressure (psf)
(w/ +GCpi) (w/ -GCpi)
1 -0.45 -13.28 -5.69
2 -0.69 -18.34 -10.75
3 -0.37 -11.59 -4.00
4 -0.45 -13.28 -5.69
5 0.40 4.64 12.23
6 -0.29 -9.91 -2.32
1E -0.48 -13.91 -6.32
2E -1.07 -26.35 -18.76
3E -0.53 -14.97 -7.38
4E -0.48 -13.91 -6.32
5E 0.61 9.06 16.65
6E -0.43 -12.86 -5.27
2OH -0.69 -14.54
2EOH -1.07 -22.55
3OH -0.37 -7.80
3EOH -0.53 -11.17
2EOH+W -1.07/-0.7 -37.31
3EOH+W -0.53/-0.7 -25.93
a) (+) and (-) signs signify wind pressures acting toward & away from surfaces.
b) External Pressure Coefficients linearly interpolated from Fig. 28.4-1 ASCE 7-10.
c) Design building for all wind directions, 4 load patterns per load case.
d) Total horizontal shear shall not be less than that by neglecting roof wind forces.
e) Min. wind load for enclosed or partially enclosed bldg.: 16 psf wall, 8 psf roof.
f) Design pressures are for strength design, multiply by 0.6 for ASD.


Torsional Load Cases
Surface Load Case GCpf Design Pressure (psf)
(w/ +GCpi) (w/ -GCpi)
1T A - 2.00 3.90
2T A - 0.16 2.06
3T A - -3.21 -1.32
4T A - -2.90 -1.00
5T B - 1.16 3.06
6T B - -2.48 -0.58
a) (+) and (-) signs signify wind pressures acting toward & away from surfaces.
b) Pressures designated with a "T" are 25% of full design wind pressures.
c) Torsional loading shall apply to all 8 load patterns using the figures shown.
d) Design pressures are for strength design, multiply by 0.6 for ASD.
e) Torsional Design Exceptions: One story bldg. with h ≤ 30 ft,
   Two stories or less framed with light frame construction,
   Two stories or less with flexible diaphragms.
Wind Loads 2024D400
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
11/25/2024 2
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5. Wind Load Calculations


1.) Lateral Loads - Transverse Direction:


Lateral Loads on Roof Diaphragm with Positive Internal Pressure
30 ft.
6.00 ft.
24.00 ft.
45.9 plf
38.3 plf
35.5 plf
26.4 plf
2964 lbs
2719 lbs
119.7 plf
102.9 plf
-15.2 plf
-5.1 plf
-45.5 plf
-35.4 plf
3.4 plf
3.9 plf
89.4 plf
72.5 plf
4.5 plf
3.6 plf
1 ft.
1 ft.
a) (-) signs signify wind lateral forces acting opposite to the direction of the arrows shown.
b) Strength design values multiplied by 0.6 to obtain ASD values.



Wind Base Shear (ASD)
Load Case A: Transverse Direction
Load Case Walls (lbs) Roof (lbs) Roof Overhangs (lbs) Total Lateral Load (lbs) R1 (lbs) R2 (lbs)
Positive Internal Pressure 2041 3400 242 5683 2964 2719
Negative Internal Pressure 2041 3400 242 5683 2964 2719
Roof Pressure = 0 2041 0 0 2041 1061 980
Min. Pressures (8 psf, 16 psf) 1584 1920 230 3734 1867 1867
a) Bottom half of wall neglected in tributary area calculations.
b) Strength design values multiplied by 0.6 to obtain ASD values.
Wind Loads 2024D400
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
11/25/2024 3
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2.) Lateral Loads - Longitudinal Direction:


Lateral Loads on Roof Diaphragm with Positive Internal Pressure
40 ft.
3.00 ft.
37.00 ft.
42.4 plf
32.7 plf
29.9 plf
15.3 plf
39.5 lbs
296.7 lbs
840.7 lbs
1163.6 lbs
2206 lbs
2127 lbs
a) (-) signs signify wind lateral forces acting opposite to the direction of the arrows shown.
b) Strength design values multiplied by 0.6 to obtain ASD values.
c) Where the length of building (L) exceeds 4X the mean roof height (h), wind drag forces should additionally be considered.



Wind Base Shear (ASD)
Load Case B: Longitudinal Direction
Load Case Walls (lbs) Gable Ends (lbs) Roof (lbs) Total Lateral Load (lbs) RA (lbs) RB (lbs)
Positive Internal Pressure 1993 2340 0 4333 2206 2127
Negative Internal Pressure 1993 2340 0 4333 2206 2127
Roof Pressure = 0 1993 2340 0 4333 2206 2127
Min. Pressures (8 psf, 16 psf) 2112 2560 0 4672 2336 2336
a) Bottom half of wall neglected in tributary area calculations.
b) Strength design values multiplied by 0.6 to obtain ASD values.
Wind Loads 2024D400
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
11/25/2024 4
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3.) Roof Truss Reactions:


Roof Truss/Rafter Reactions: Transverse End Zone
-386 lbs
-181 lbs
Max. Horz. ① = 272 lbs
Max. Uplift ① = 139 lbs
a) Strength design values multiplied by 0.6 to obtain ASD values.
b) Windward loads may be positive or negative depending on pitch of roof.



Roof Truss/Rafter Reactions (ASD)
w/ Positive Internal Pressure
Load Case Horizontal Load (lbs) Gross Uplift (lbs) Net Uplift (lbs) U1 (lbs) U2 (lbs)
Transverse Int. Zone -215 316 -588 -374 -213
Transverse End Zone -272 337 -567 -386 -181
Longitudinal Int. Zone 113 745 -159 -35 -124
Longitudinal End Zone 191 1032 128 139 -11
a) Gross Uplift calculations do not include any counteracting roof dead loads.
b) Net Uplift calculations include counteracting roof dead loads multiplied by 0.6 per load case (7) ASCE 7-10.
c) Strength design values multiplied by 0.6 to obtain ASD values for wind loads.
d) Loads based on truss spacing calculated at 24" o/c.
e) Negative values for horizontal load indicate load acting in windward direction (tranverse load cases).
f) Negative values for uplift indicate net downward force (zero uplift).













*Disclaimer: The calculations produced herein are for initial design and estimating purposes only. The calculations and drawings presented do not constitute a fully engineered design. All of the potential load cases required to fully design an actual structure may not be provided by this calculator. For the design of an actual structure, a registered and licensed professional should be consulted as per IRC 2012 Sec. R802.10.2 and designed according to the minimum requirements of ASCE 7-10. The wind load calculations provided by this online tool are for educational and illustrative purposes only. Medeek Design assumes no liability or loss for any designs presented and does not guarantee fitness for use.
Wind Loads 2024D400
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
11/25/2024 5