ABCDEFGHIJKLMNOPQR
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PROJECT :
PAGE :
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CLIENT :
DESIGN BY :
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JOB NO. : DATE :
REVIEW BY :
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Wind Analysis for Low-rise Building, Based on ASCE 7-05 / IBC 2006
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INPUT DATA
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Exposure category (B, C or D)
B
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Importance factor, pg 77, (0.87, 1.0 or 1.15)
I =1.00Category II
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Basic wind speed (IBC Tab 1609.3.1V3S)
V =90mph
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Topographic factor (Sec.6.5.7.2, pg 26 & 45)
Kzt =1Flat
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Building height to eave
he =35ft
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Building height to ridge
hr =39ft
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Building length
L =100ft
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Building width
B =60ft
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Effective area of components
A =50ft2
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DESIGN SUMMARY
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Max horizontal force normal to building length, L, face
=39.00kips
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Max horizontal force normal to building length, B, face
=22.20kips
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Max total horizontal torsional load
=422.21ft-kips
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Max total upward force
=60.00kips
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ANALYSIS
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Velocity pressure
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qh = 0.00256 Kh Kzt Kd V2 I
=13.08psf
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where:
qh = velocity pressure at mean roof height, h. (Eq. 6-15, page 27)
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Kh = velocity pressure exposure coefficient evaluated at height, h, (Tab. 6-3, Case 1,pg 79)
=0.74
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Kd = wind directionality factor. (Tab. 6-4, for building, page 80)
=0.85
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h = mean roof height
=37.00ft
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< 60 ft, [Satisfactory]
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Design pressures for MWFRS
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p = qh [(G Cpf )-(G Cpi )]
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where:
p = pressure in appropriate zone. (Eq. 6-18, page 28).
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G Cp f = product of gust effect factor and external pressure coefficient, see table below. (Fig. 6-10, page 53 & 54)
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G Cp i = product of gust effect factor and internal pressure coefficient.(Fig. 6-5, Enclosed Building, page 47)
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=0.18or-0.18
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a = width of edge strips, Fig 6-10, note 9, page 54, MAX[ MIN(0.1B, 0.4h), 0.04B,3] =
6.00ft
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Net Pressures (psf), Basic Load Cases
Net Pressures (psf), Torsional Load Cases
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SurfaceRoof angle q =7.59Roof angle q =0.00SurfaceRoof angle q =7.59
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G Cp fNet Pressure withG Cp fNet Pressure withG Cp fNet Pressure with
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(+GCp i )(-GCp i )(+GCp i )(-GCp i )(+GCp i )(-GCp i )
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10.423.177.880.402.887.591T0.420.791.97
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2-0.69-11.38-6.67-0.69-11.38-6.672T-0.69-2.84-1.67
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3-0.39-7.44-2.73-0.37-7.19-2.483T-0.39-1.86-0.68
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4-0.31-6.46-1.76-0.29-6.15-1.444T-0.31-1.62-0.44
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1E0.646.0510.760.615.6210.33SurfaceRoof angle q =0.00
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2E-1.07-16.35-11.64-1.07-16.35-11.64G Cp fNet Pressure with
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3E-0.56-9.65-4.94-0.53-9.29-4.58(+GCp i )(-GCp i )
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4E-0.47-8.45-3.74-0.43-7.98-3.271T0.400.721.90
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5-0.45-8.24-3.53-0.45-8.24-3.532T-0.69-2.84-1.67
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6-0.45-8.24-3.53-0.45-8.24-3.533T-0.37-1.80-0.62
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4T-0.29-1.54-0.36
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Basic Load Cases in Transverse Direction
Basic Load Cases in Longitudinal Direction
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SurfaceAreaPressure (k) withSurfaceAreaPressure (k) with
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(ft2)(+GCp i )(-GCp i )(ft2)(+GCp i )(-GCp i )
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130809.7724.27117905.1513.58
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22663-30.30-17.7622421-27.55-16.15
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32663-19.82-7.2832421-17.42-6.02
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43080-19.91-5.4141790-11.01-2.58
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1E4202.544.521E4302.424.44
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2E363-5.94-4.232E605-9.90-7.05
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3E363-3.50-1.793E605-5.62-2.77
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4E420-3.55-1.574E430-3.43-1.40
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SHoriz.34.0634.06SHoriz.22.0022.00
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Vert.-59.04-30.79Vert.-59.95-31.70
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10 psf min.Horiz.39.0039.0010 psf min.Horiz.22.2022.20
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Sec. 6.1.4.1Vert.-60.00-60.00Sec. 6.1.4.1Vert.-60.00-60.00
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Torsional Load Cases in Transverse Direction
Torsional Load Cases in Longitudinal Direction
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SurfaceAreaPressure (k) withTorsion (ft-k)SurfaceAreaPressure (k) withTorsion (ft-k)
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(ft2)(+GCp i )(-GCp i )(+GCp i )(-GCp i )(ft2)(+GCp i )(-GCp i )(+GCp i )(-GCp i )
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113304.2210.489323116801.965.161746
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21150-13.09-7.67-38-2221816-20.66-12.116840
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31150-8.56-3.1425931816-13.06-4.51-43-15
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41330-8.60-2.33189514680-4.18-0.98379
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1E4202.544.521121991E4302.424.4458106
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2E363-5.94-4.23-35-252E605-9.90-7.053323
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3E363-3.50-1.7920103E605-5.62-2.77-19-9
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4E420-3.55-1.57156694E430-3.43-1.408234
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1T17501.393.45-35-861T11100.802.10-12-31
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2T1513-4.30-2.521482T2421-6.89-4.04-46-27