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ANNEX F: CRITERIA FOR THE ANALYSIS OF EXISTING STRUCTURES

Periodic revisions to this standard are made by the Committee based upon comments received from the industry.

The committee does not intend that existing structures be analyzed for each revision of the standard; however, structural analysis of existing structures should be performed by qualified professional engineers using the latest edition of this standard when:

a) There is a change in antennas, transmission lines, and/or appurtenances (quantity, size, location, or type)
b) There is a change in operational requirements (twist and sway)
c) There is a need to increase wind or ice loading

To perform the analysis, the following data is required:

a) Member sizes, dimensions, and connections
b) Material properties
c) Existing and proposed loading; antennas (size, elevation, and azimuth), transmission lines, and appurtenances

Data may be obtained from the following sources:

a) Previous stress and rigidity analysis (structure and foundation)
b) Structural and detail drawings (design and as-built)
c) Specifications
d) Construction records
e) Field investigation

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