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• To: seaoc(--nospam--at)seaoc.org
• Subject: Wind load program 'wind.exe'
• From: Szuchuan Chang <szchang(--nospam--at)pacbell.net>
• Date: Fri, 05 Jun 1998 21:45:48 -0700

Hi:

Saw a few articles about wind loads.  Looked over the web and could not
find an example on a automated method of handling a simple building load

accumulation.  I dom't have the Enercalc.  Here is my interpretation on
the 1997 UBC wind load for buildings.  Because the size, it can?t be
attached to the SEAOC mail.  To obtain this program, you can either
http://members.tripod.com/~stlshape/index.html or leave me an e-mail so
I can send it to you.

Your input on my interpretation is appreciated.

Sam Chang, SE

e-mail  szchang(--nospam--at)pacbell.net

Here is an example of the output ??................................

************************************
*            WIND.OUT              *
*    Primary Frames and Systems    *
*  Method 1,  Normal Force Method  *
*       by Szuchuan Chang, SE      *
************************************

design wind speed = 70 mph.
type of exposure = 'c'
importance factor = 1
average roof height, leeward side = 44 ft
1997 UBC Eq. (16-1)  P =Ce*Cq*qs*I;
Cq_windward =0.8  Cq_leeward =0.5  qs =12.6 psf.    I = 1

[7]  segment: top @ 44 ft.  bott  @ 40 ft.  top(width)  = 25ft.
bott(width) = 28.75 ft
windward: Ce = 1.43  pressure = 14.4144 psf.  force = 1549.55 pounds
leeward: Ce = 1.43  pressure = 9.009 psf.  force = 968.467 pounds
wind+lee = 2518.02 pounds   centered @ 41.9535 ft
accumulated shear = 2518.02 pounds   otm = 4.91891 kip-ft

roof type        slope :        outward pressure,       inward
pressure

==========================================================================

leeward roof                      12.6126 psf,     *************
flat roof                         12.6126 psf,     *************
windward (0:12 < slope < 2:12)    12.6126 psf,     *************
windward (2:12 < slope < 9:12)    16.2162 psf,     5.4054 psf
windward (9:12 < slope <12:12)    *************       7.2072 psf
windward (12:12 < slope )         *************       12.6126 psf

[6]  segment: top @ 40 ft.  bott  @ 30 ft.  top(width)  = 28.75ft.
bott(width) = 38.125 ft
windward: Ce = 1.31  pressure = 13.2048 psf.  force = 4415.36 pounds
leeward: Ce = 1.43  pressure = 9.009 psf.  force = 3012.38 pounds
wind+lee = 7427.74 pounds   centered @ 34.7664 ft
accumulated shear = 9945.75 pounds   otm = 65.5023 kip-ft

[5]  segment: top @ 30 ft.  bott  @ 28 ft.  top(width)  = 38.125ft.
bott(width) = 40 ft
windward: Ce = 1.23  pressure = 12.3984 psf.  force = 968.625 pounds
leeward: Ce = 1.43  pressure = 9.009 psf.  force = 703.828 pounds
wind+lee = 1672.45 pounds   centered @ 28.992 ft
accumulated shear = 11618.2 pounds   otm = 87.0529 kip-ft

[4]  segment: top @ 28 ft.  bott  @ 25 ft.  top(width)  = 40ft.
bott(width) = 40 ft
windward: Ce = 1.23  pressure = 12.3984 psf.  force = 1487.81 pounds
leeward: Ce = 1.43  pressure = 9.009 psf.  force = 1081.08 pounds
wind+lee = 2568.89 pounds   centered @ 26.5 ft
accumulated shear = 14187.1 pounds   otm = 125.761 kip-ft

[3]  segment: top @ 25 ft.  bott  @ 20 ft.  top(width)  = 40ft.
bott(width) = 40 ft
windward: Ce = 1.19  pressure = 11.9952 psf.  force = 2399.04 pounds
leeward: Ce = 1.43  pressure = 9.009 psf.  force = 1801.8 pounds
wind+lee = 4200.84 pounds   centered @ 22.5 ft
accumulated shear = 18387.9 pounds   otm = 207.198 kip-ft

[2]  segment: top @ 20 ft.  bott  @ 15 ft.  top(width)  = 40ft.
bott(width) = 40 ft
windward: Ce = 1.13  pressure = 11.3904 psf.  force = 2278.08 pounds
leeward: Ce = 1.43  pressure = 9.009 psf.  force = 1801.8 pounds
wind+lee = 4079.88 pounds   centered @ 17.5 ft
accumulated shear = 22467.8 pounds   otm = 309.338 kip-ft

[1]  segment: top @ 15 ft.  bott  @ 0 ft.  top(width)  = 40ft.
bott(width) = 40 ft
windward: Ce = 1.06  pressure = 10.6848 psf.  force = 6410.88 pounds
leeward: Ce = 1.43  pressure = 9.009 psf.  force = 5405.4 pounds
wind+lee = 11816.3 pounds   centered @ 7.5 ft
accumulated shear = 34284.1 pounds   otm = 734.977 kip-ft

Total shear force = 34.2841 kips