ANSI TIA-222-H-2017 Structural Standard for Antenna Supporting Structures Antennas and Small Wind Turbine Support Structures ( Effective January 01 2018 ).pdf

1、TIA-222-H (Revision of ANSI/TIA-222-G) October 2017Structural Standard for Antenna Supporting Structures, Antennas and Small Wind Turbine Support Structures Effective January 01, 2018 ANSI/TIA-222-H-2017 APPROVED: OCTOBER 5, 2017 NOTICE TIA Engineering Standards and Publications are designed to serv

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23、TS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. ANSI/TIA-222-H ACKNOWLEDGEMENTS The Telecommunications Industry Association (TIA) acknowledges the work of the Structural Standard for Antenna Supporting Structures, Antennas and Small Wind Turbine Support Structures TR14 committee Task Grou

24、p 3 and associated Ad Hoc Groups. These groups comprise individuals from many backgrounds including: manufacturers, owners, consulting engineers, government entities, research and construction industries. This revision of the Standard began in 2013 and incorporates information as described in the St

25、andard. This Standard was prepared through the consensus standards process by balloting in compliance with the procedures of Telecommunications Industry Association (TIA) and American National Standard Institute (ANSI). Those individuals who lead the Task Group and Ad Hoc committees are: Task Group

26、Chair E. Mark Malouf, PE, SECB, IPF (TR14 Vice-Chair) Malouf Engineering Intl Editorial Committee John Erichsen, PE, SE (TR14 Chair) EET E. Mark Malouf, PE, SECB, IPF (TR14 Vice-Chair) Malouf Engineering Intl Bryan Lanier, PE, SE (TR14 Secretary) American Tower Corp. David Brinker, PE, SE Rohn Produ

27、cts John Wahba, PE, P Eng. Turris Corp. Stephen Yeo, PE Rohn Products Intl Ad Hoc Group Leads Madison Batt, PE, SE Tower Engineering Co. Section 2, Annex C, Annex D Peter Chojnacki Tower Numerics Section 3, Annex E, Annex L Ping Jiang, PE Black iQi= required strength (load effects due to factored lo

28、ads and load combinations). ANSI/TIA-222-H Section 2 Page 2-1 2.0 LOADS 2.1 Scope This Section provides minimum load requirements for structures addressed in the scope of this Standard. 2.2 Risk Categorization of Structures Definitions Facility: all or any portion of buildings, structures, site impr

29、ovements, elements and pedestrian or vehicular routes located on a site. Hardened network: a network intended to provide the level of reliability and resiliency of an emergency communication system during and immediately following a natural or manmade disaster in accordance with a service level agre

30、ement with the operator of the emergency communication system that specifies requirements including, but not limited to, the following: protection from storm damage, immediate and long-term clean power backup systems, surge protection for electronics, monitoring, security and maintenance schedules.

31、Site: a parcel of land bounded by a lot line or a designated portion of public right-of-way. General Structures shall be categorized according to Table 2-1 for the purposes of determining wind, ice and earthquake loads based on the risk to human life, damage to a facility in the event of failure, an

32、d the primary use and intended purpose of the structure. When surrounding facilities have a higher risk category than the structure, categorization of the structure shall use the risk category of surrounding facilities if the facility could be damaged or physically impacted in the event of failure o

33、f the structure. When surrounding facilities have a higher risk category than the structure but the facility would not be damaged or physically impacted in the event of failure of the structure, the risk category of the structure shall not be based on the risk category of the surrounding facilities.

34、 2.2.2.1 Multiple Services It shall be permissible to categorize structures used primarily for commercial services as Risk Category II when the structure is also used to support antennas, radios, equipment or other appurtenances for fire, police or other emergency communication services and the site

35、 is not required to be part of a hardened network by the owner and service provider. 2.3 Combination of Loads Symbols and Notations D = dead load of structure and appurtenances, excluding guy assemblies; Dg= dead load of guy assemblies; Di= weight of ice; Section 2 ANSI/TIA-222-H Page 2-2 Eh= horizo

36、ntal seismic load effect; Ev= vertical seismic load effect; Ti= load effects due to temperature; Wi= concurrent wind load with ice; Wo = wind load without ice. Strength Limit State Load Combinations Structures and foundations shall be designed such that their design strength equals or exceeds the lo

37、ad effects of the factored loads in each of the following limit state combinations: 1. 1.2 D + 1.0 Dg+ 1.0 Wo 2. 0.9 D + 1.0 Dg+ 1.0 Wo 3. 1.2 D + 1.0 Dg+ 1.0 Di+ 1.0 Wi+ 1.0 Ti4. 1.2 D + 1.0 Dg+ 1.0 Ev+ 1.0 Eh5. 0.9 D + 1.0 Dg- 1.0 Ev+ 1.0 EhExceptions: 1. Temperature effects need not be considered

38、 for self-supporting structures. 2. Ice and earthquake loading need not be considered for Risk Category I structures. 3. No load factor shall be applied to the initial tension of guys. 4. Load combinations 2 and 5 apply to self-supporting structures only. Notes: 1. Unfactored dead loads shall be use

39、d to determine seismic load effects in loading combinations 4 and 5. 2. For foundation designs, the weight of soil directly supported by the foundation and the weight of the foundation shall be considered as a dead load in all loading combinations. For guy anchor foundations, the weight of soil dire

40、ctly above the foundation and the weight of the foundation shall utilize a 0.9 dead load factor. For all foundation types, when determining a soil nominal resistance that is a function of soil weight (e.g. gross soil bearing resistance, skin friction, lateral soil resistance, etc.), a factor of 1.0

41、shall be applied to the weight of soil and the resulting soil nominal strength shall be multiplied by the appropriate resistance factor defined in 9.4 to determine the soil design strength. (Refer to sections 9.4 and 9.7). 2.4 Temperature Effects The design tension of guys shall be based on an initi

42、al temperature of 60 degrees Fahrenheit 16 degrees C. In the absence of more accurate site data, a 50 degrees Fahrenheit 28 degrees C reduction in temperature shall be considered to occur with loading combinations that include ice. ANSI/TIA-222-H Section 2 Page 2-3 2.5 Dead Loads Definitions Dead lo

43、ad, D: the weight of the structure, and appurtenances, excluding guy assemblies, and for foundation design, the weight of soil and substructure. Guy assembly dead load, Dg: the weight of all guy assemblies, including guys, end fittings, and insulators. 2.6 Wind and Ice Loads Definitions Appurtenance

44、s: items attached to the structure such as antennas, antenna mounts, transmission lines, conduits, lighting equipment, climbing devices, platforms, signs, anti-climbing devices, etc. Basic wind speed, V: 3-second gust wind speed at 33 ft. 10 m above the ground in Exposure C as defined in 2.6.5.1.2 f

45、or a mean recurrence interval associated with the risk category of the structure. Basic wind speed with ice, Vi: 3-second gust wind speed concurrent with the design ice thickness at 33 ft. 10 m above the ground in Exposure C as defined in 2.6.5.1.2. Design ice thickness, ti: the uniform radial thick

46、ness of glaze ice at 33 ft. 10 m above the ground in Exposure C as defined in 2.6.5.1.2 for a 500-year mean recurrence interval. Design wind load, FW: equivalent static force to be used in the determination of wind loads. Discrete appurtenance: an appurtenance modeled as a concentrated load. Effecti

47、ve projected area, EPA: projected area of an object multiplied by a force coefficient (also called a drag factor) used in the determination of wind loads. Escarpment: a steep slope generally separating two levels or gently sloping areas. Flat topped hill: a land surface characterized by a strong rel

48、ief in all horizontal directions with a flat top. Flat topped ridge: an elongated crest characterized by a strong relief in one horizontal direction. Glaze ice: ice accretion assumed to have a unit weight of 56 lb/ft38.8 kN/m3. Height of structure, h: the height of a structure, including latticed or

49、 tubular poles mounted on the structure, but excluding lightning rods and similar appurtenances. Hill: a land surface characterized by a strong relief in all horizontal directions. Linear appurtenance: an appurtenance modeled as a distributed load. Section 2 ANSI/TIA-222-H Page 2-4 Ridge: an elongated crest characterized by strong relief in two horizontal directions. Symmetrical appurtenance: an appurtenance for which the effective projected area (EPA) is considered constant for all wind directions. Velocity pressure, qz: equivalent static pressure used in the determi