TTI FLAT JACK, Руководство по установке

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4.5 Example Wind Load Calculation
using ASCE 7-05
The TTi FLAT JACK® has been installed on a wide range of
residential rooftops. It can be mounted properly with a
wide variety of PV systems.
NOTE: The following example is provided FOR INFOR-
MATION ONLY, and should not be used in place of your
own engineering calculations.
For assistance in making your calculations, contact TTi.
See Chapter 7 for obtaining assistance from TTi.
The procedure for determining wind loads is specified by
the American Society of Civil Engineers and is referenced
in the International Building Code 2006. The installer,
licensed professional engineer, and local building official
are all responsible for understanding the assumptions
and limitations of using this procedure for specifying the
FLAT JACK® system.
Method 1 for calculating the design wind load for
pressures on components and cladding is generally the
most applicable to PV systems on residential rooftops.
Example System Characteristics
Wind Load Calculation
Using ASCE 7-05 and the characteristics of the example
system, the wind load can be ascertained:
Location: Novato, CA
Effective wind area: 10 sf (smallest area of continuous modules being
installed)
Roof height: 30 ft.
Roof pitch: 20°
Roof zone: 1
Rafter lumber: Douglas Fir
Panel orientation: Mounted in portrait
Panel height: 56 in.
Panel weight: 3.5 psf
Desired FLAT JACK®
Mounting configura-
tion:
Configuration C
Basic wind speed: 90mph
Exposure category: B