TIA SWT Support Structure Design Supplement Draft 03292011 R0
TIA SWT Support Structure Design Supplement Draft 03292011 R0
TIA SWT Support Structure Design Supplement Draft 03292011 R0
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ANSI/<strong>TIA</strong>-222-G-DS1-2011<br />
DRAFT 3-29-2011 Rev 0<br />
Small Wind Turbine <strong>Support</strong> <strong>Structure</strong>s<br />
OBJECTIVE<br />
The objective of this <strong>Design</strong> <strong>Supplement</strong> is to provide recognized literature intended to<br />
be used in conjunction with the ANSI/<strong>TIA</strong>-222-G Standard, “Structural Standard for<br />
Antenna <strong>Support</strong>ing <strong>Structure</strong>s and Antennas” (<strong>TIA</strong>) for the design and analysis of<br />
structures supporting Small Wind Turbines (<strong>SWT</strong>’s) defined as wind turbines with rotor<br />
swept areas less than 2,200 sq. ft. [200 sq. m].<br />
This <strong>Design</strong> <strong>Supplement</strong> defines how specific portions of the <strong>TIA</strong> Standard shall be<br />
applied to <strong>SWT</strong> supporting structures and provides supplementary requirements that<br />
pertain specifically to the unique characteristics of <strong>SWT</strong> supporting structures.<br />
The provisions of this <strong>Design</strong> <strong>Supplement</strong> are intended to be used for the development<br />
of standard designs for <strong>SWT</strong> supporting structures and for the design and analysis of<br />
site-specific structures.<br />
SCOPE<br />
This <strong>Design</strong> <strong>Supplement</strong> is intended to apply to self-supporting or bracketed latticed<br />
towers, guyed masts and pole structures that support single or multiple <strong>SWT</strong>s that may<br />
also support antennas and other appurtenances.<br />
The design and analysis of turbine components are not included within the scope of this<br />
<strong>Design</strong> <strong>Supplement</strong>.<br />
1.0 GENERAL<br />
1.1 <strong>Design</strong> Criteria<br />
<strong>SWT</strong> supporting structures shall be in conformance with the requirements of <strong>TIA</strong> and<br />
the additional supplementary requirements of this <strong>Design</strong> <strong>Supplement</strong>.<br />
The design parameters used for standard designs for <strong>SWT</strong> supporting structures<br />
developed in accordance with this <strong>Design</strong> <strong>Supplement</strong> shall be verified prior to<br />
installation.<br />
Conformance to this <strong>Design</strong> <strong>Supplement</strong> is not required for structures supporting wind<br />
turbines with rotor swept areas less than 22 sq. ft. [2 sq. m]. <strong>Structure</strong>s supporting<br />
turbines with rotor swept areas less than 22 sq. ft. [2 sq. m] may be designed and/or<br />
analyzed in accordance with the <strong>TIA</strong> Standard with each turbine considered as an<br />
appurtenance. The effective projected area of each turbine shall be determined in<br />
accordance with <strong>TIA</strong> Section 3.0. The effective projected area shall be considered to be<br />
constant for all wind directions. The wind force based on the effective projected area of<br />
each turbine shall be considered as a wind load using a load factor equal to 1.6 and a<br />
wake interference factor, Ka, equal to 1.0.<br />
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