ESWA Catalog 241C:ESWA Catalog 241 final copy - EVAPCO.com

6
Wind Design
The IBC 2006 code book includes a map of basic wind
speed (3-second gust) by contour lines. However, local
regulations may be more stringent than these published
speeds. The specific factors necessary for wind load as well
as a sample wind load calculation are shown on Page 8.
Whichever design force - seismic or wind - is more
severe for the building, governs the design of the
building and all attached equipment.
Design Implementation
EVAPCO applies the given seismic and wind load information
provided by the mechanical consulting engineer to
determine the equipment design necessary to meet IBC
requirements. This process ensures that the mechanical
equipment and its components are compliant per the
provisions of the IBC as given in the plans and specifications
for the project. For design build projects, EVAPCO is
equipped to look up the information and submit the
resulting loads for approval.
Independent Certification
Per the most recent edition of the code, the EVAPCO
compliance process included an exhaustive analysis by an
independent approval agency. As required by the
International
Building Code,
EVAPCO sup-
plies a certificate
of compliance
as part of
its submittal
documents. The
certificate of
compliance
demonstrates
Wind Load Map Courtesy IBC 2006 Text –
See full-sized map for location specific values
Certificate
of
IBC COMPLIANCE
Compliance
A T , U S S , U A T , U T C o o l i n g T o w e r s
ATW(B) and ESWA Closed
Circuit
Coolers
ATC-E and HTC Evaporative
Condensers
A r e c e r t i f i e d t o m e e t o r e x c e e d t h e S e i s m i c a n d W i n d L o a d P r o v i s i o n s
s e t f o r t h i n t h e a p p l i c a b l e b u i l d i n g c o d e s f o r t h i s p r o j e c t .
T h e s e p r o d u c t s h a v e b e e n m a n u f a c t u r e d f o l l o w i n g a l l
a p p l i c a b l e q u a l i t y a s s u r a n c e p r o g r a m s .
A p p l i c a b l e B u i l d i n g C o d e s :
I B C 2 0 0 6
A S C E - 7
N F P A 5 0 0 0
R e f e r e n c e d R e p o r t :
V M A - 4 3 3 8 7
A p p r o v a l A g e n c y :
V M C S e i s m i c C o n s u l t i n g G r o u p
EVAPCO. . . Specialists
in
Heat
Transfer
Products
and
Services.
I D I B C C O C 0 0 1
that the equipment has been independently tested and
analyzed in accordance with the IBC seismic and wind
load requirements. Evapco has worked closely with the
independent approval agency, The VMC Group, to complete
the independent equipment testing and analysis.
If the seismic “g force” and wind “psf” load requirements
for the project site are known, EVAPCO’s online equipment
selection software, iES, will allow you to choose the
required structural design package – either standard construction
or upgraded construction.
If the project requirements are unknown, the following
calculations must be completed.
For further questions regarding IBC compliance, please
contact your local EVAPCO Representative or visit
www.evapco.com.
When using the EVAPCO selection software to make a
selection, these calculations are already incorporated
into the selection process. Simply enter the required
seismic factors and the Seismic Design Force and Wind
Load will be calculated automatically!!
Seismic Load Calculations
The data required to calculate the seismic load are:
Occupancy Category – I, II, III or IV depending on the
nature of the building occupancy. Table 1604.5 in the IBC
2006 Code Book defines each of the four categories in
detail. In summary the four categories are:
• Category I - structures that represent a low hazard
to human life in the event of a failure.
• Category III - structures that represent a substantial
hazard to human life in the event of a failure.
• Category IV - structures designated as essential
facilities.
• Category II - any structures not listed in I, III or IV.
Site Classification – A, B, C, D, E or F based on the types
of soil and their engineering properties. Table 1613.5.2 in
the IBC 2006 Code Book defines each of the categories in
detail. IBC specifies site class “D” when soil properties are
unknown.
Maximum Spectral Response Acceleration (Ss) –
Numerical value found using the U.S. Geological (USGS)
data based on the Zip Code of the project. This data
point can be determined using the Ground Motion
Parameter Calculator at http://www.usgs.gov/. Note the
calculator assumes a site classification of B for the 0.2 second
maximum Ss. The site coefficient (Fa), defined below,
will correct for the actual site classification.