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Wind Load Report - Tift Shelter

1. Site & Building Data

Roof Type: Gable  
Wind Speed (ult): 115 mph
Exposure Category: C  
Enclosure Class: Open  
Building Width (W): 15 ft.
Building Length (L): 15 ft.
Eave Height (he): 9 ft.
Foundation Height (hf): 0 ft.
Roof Pitch: 6 /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): 26.57 deg.
Mean Roof Height (h): 10.88 ft.
Ridge Height (hr): 12.75 ft.
Pos. Internal Pressure (+GCpi): +0.00  
Neg. Internal Pressure (-GCpi): -0.00  
Velocity Pressure Exp. Coeff. (Kh): 0.85 @ z=h
Velocity Pressure (qh): 24.43 psf
End Zone Width (a): 3.00 ft.
Zone 2/2E Dist.: 7.50 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: 5 psf
Bottom Chord Dead Load: 5 psf
Truss/Rafter Spacing: 16 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 0.55 13.43
2 -0.10 -2.42
3 -0.45 -10.92
4 -0.39 -9.54
1E 0.73 17.78
2E -0.19 -4.65
3E -0.58 -14.29
4E -0.53 -13.07
2OH -0.10 -2.42
2EOH -0.19 -4.65
3OH -0.45 -10.92
3EOH -0.58 -14.29
2OH+W -0.10/-0.7 -19.52
2EOH+W -0.19/-0.7 -21.75
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.
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Load Case B: Longitudinal Direction
Surface GCpf Design Pressure (psf)
(w/ +GCpi) (w/ -GCpi)
1 -0.45 -10.99
2 -0.69 -16.86
3 -0.37 -9.04
4 -0.45 -10.99
5 0.40 9.77
6 -0.29 -7.08
1E -0.48 -11.73
2E -1.07 -26.14
3E -0.53 -12.95
4E -0.48 -11.73
5E 0.61 14.90
6E -0.43 -10.50
2OH -0.69 -16.86
2EOH -1.07 -26.14
3OH -0.37 -9.04
3EOH -0.53 -12.95
2EOH+W -1.07/-0.7 -43.24
3EOH+W -0.53/-0.7 -30.05
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 - 3.36
2T A - -0.61
3T A - -2.73
4T A - -2.39
5T B - 2.44
6T B - -1.77
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.
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5. Wind Load Calculations


1.) Lateral Loads - Transverse Direction:


Lateral Loads on Roof Diaphragm with Positive Internal Pressure
15 ft.
6.00 ft.
9.00 ft.
35.3 plf
25.8 plf
48.0 plf
36.3 plf
725 lbs
635 lbs
32.2 plf
24.6 plf
10.5 plf
5.4 plf
10.5 plf
5.4 plf
6.5 plf
5.9 plf
32.2 plf
24.6 plf
4.3 plf
3.3 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 1058 302 -1 1360 725 635
Negative Internal Pressure 1058 302 -1 1360 725 635
Roof Pressure = 0 1058 0 0 1058 567 491
Min. Pressures (8 psf, 16 psf) 648 270 77 995 497 497
a) Bottom half of wall neglected in tributary area calculations.
b) Strength design values multiplied by 0.6 to obtain ASD values.
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2.) Lateral Loads - Longitudinal Direction:


Lateral Loads on Roof Diaphragm with Positive Internal Pressure
15 ft.
3.00 ft.
12.00 ft.
28.4 plf
19.1 plf
40.2 plf
26.4 plf
34.3 lbs
68.3 lbs
51.2 lbs
142.2 lbs
556 lbs
492 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 752 296 0 1048 556 492
Negative Internal Pressure 752 296 0 1048 556 492
Roof Pressure = 0 752 296 0 1048 556 492
Min. Pressures (8 psf, 16 psf) 648 270 0 918 459 459
a) Bottom half of wall neglected in tributary area calculations.
b) Strength design values multiplied by 0.6 to obtain ASD values.
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3.) Roof Truss Reactions:


Roof Truss/Rafter Reactions: Transverse End Zone
-8 lbs
14 lbs
Max. Horz. ① = 45 lbs
Max. Uplift ① = 90 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 -22 104 -32 -25 -7
Transverse End Zone -26 142 6 -8 14
Longitudinal Int. Zone 27 176 40 35 5
Longitudinal End Zone 45 266 130 90 39
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 16" 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 Accessibility Trail 1200 Fuhrman Blvd. Buffalo NY 2025D214
Engineer NJA Engineering
941 New Road, Amherst NY 14228
ph. (716) 572-1140    _ 		-
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