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### Records in this category

- Section 15.4 question regarding Changed Conditions Requiring a Structural Analysis; submitted 2/14/2007
- Section 15.4 question regarding existing tower re-analysis; submitted 12/31/2007
- Section 15.5 indicated "A feasibility report shall state that final acceptance of changed conditions shall be based upon a rigorous structural analysis". I would like to confirm my interpretation regards this section. Is it mean for any equipment upgrade on the tower, a rigorous analysis is required? If the rigorous analysis is required, then the reactions comparison for foundation capacity is not enough? A site-specific geotechnical and foundation data are required? A lot of the clients are questioning why a rigorous analysis is needed for anybody to go on the tower. Why the reactions comparison is not adequate?
- I am a commercial building reviewer for the City of San Antonio. My question is related to cell tower collocations. San Antonio requires that a building permit is secured before the work is started. See below for complete question
- Should mounts be subjected to Section 15 requirements that would be applied to the supporting structure? Does Section 15.4 Changed Conditions Requiring a Structural Analysis apply to mounts as well as the supporting structure?

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## Section 15.0 - Existing Structures

ID #1108

## Section 15.5 indicated "A feasibility report shall state that final acceptance of changed conditions shall be based upon a rigorous structural analysis". I would like to confirm my interpretation regards this section. Is it mean for any equipment upgrade on the tower, a rigorous analysis is required? If the rigorous analysis is required, then the reactions comparison for foundation capacity is not enough? A site-specific geotechnical and foundation data are required? A lot of the clients are questioning why a rigorous analysis is needed for anybody to go on the tower. Why the reactions comparison is not adequate?

Question:
Section 15.5 indicated "A feasibility report shall state that final acceptance of changed conditions shall be based upon a rigorous structural analysis". I would like to confirm my interpretation regards this section. Is it mean for any equipment upgrade on the tower, a rigorous analysis is required? If the rigorous analysis is required, then the reactions comparison for foundation capacity is not enough? A site-specific geotechnical and foundation data are required? A lot of the clients are questioning why a rigorous analysis is needed for anybody to go on the tower. Why the reactions comparison is not adequate?
Response:
A rigorous structural analysis is only required for significant changes as defined in Section 15.4.
When foundation details are missing, associated assumptions must be documented along with the results of a rigorous structural analysis in accordance with Section 15.5.2. It is not within the scope of the Standard to determine the significance of the assumptions made for a rigorous analysis for a specific structure.

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**Related entries: **

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- Figure A1-1 Why were the tables and Note 3 removed from the figures
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- Section 2.6.9.2Can I use loading that is less than the values prescribed by the written TIA-222-G and claim compliance with the standard? If so, under what conditions?

Author: John Erichsen

Revision: 1.1

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