Revision H: Key Changes Moving Forward for ANSI/TIA-222-H · Revision H: Key Changes Moving Forward...
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Revision H: Key Changes Moving Forward for ANSI/TIA-222-H Learn about structural engineering services at at www.fdh-is.com Wind Speed Wind speed maps revised based on newer weather data. Fabrication Fabricators for new towers and poles must be certified per AISC 201-06. Existing Structures 5% overstress allowed for changed conditions on existing structures. Additional 5% capacity gained by using load modification factors in Annex S. Appurtenances Mounting Systems New specifications for analyzing mounts. Annex J addresses mount mapping requirements. Initial Construction Inspection Inspection must be performed during new construction. Existing Structures Modification Inspection Inspection must be performed during modification construction. ©2018 FDH Infrastructure Services, LLC Mapping of Structural Members and Connections Added requirements for bracing offsets, number of guy cable strands, details of torque arms and guy lugs, porthole welds, and member edge distances, gauges, and coping. Maintenance and Condition Assessment Added requirements for inspecting weld cracks under radomes/shrouds in concealment sections, obstructions to lighting system, obstructions to climbing path, and safety climb system. Grounding Specific details provided for configuration of grounding rods and wires. Revised standard grounding cables from 2/0 AWG to #2 AWG. Climbing Strength requirements changed for step bolts, rest platforms, ladders, support rails, safety climb systems, and fall protection anchorage. Installation of appurtenances cannot degrade climbing facility. Wind Force Coefficient for Poles For poles without external pieces, force coefficients reduced by 3% to 25%. Wind Direction Probability Factor Factor increased from 0.95 to 1.00 for concealment poles. Ice Loading Ice thickness maps revised based on newer weather data; conversion factor built in. Seismic Loading Every tower must be analyzed for seismic loads. Calculations based on newer ASCE 7-16 standard. Rooftop Wind Speed Up Factor New factor required for structures on isolated buildings taller than 50 feet and on buildings 50 feet taller than adjacent buildings. Ground Elevation Factor New factor that reduces wind pressure due to lower air density at higher elevations. AISC Standard Steel calculations based on newer AISC 360-16 standard. Bolt Shear Strength Changed formula for bolt shear strength with component that depends on connection length. LOADING STRENGTH STRUCTURAL ELEMENTS & APPURTENANCES
Transcript of Revision H: Key Changes Moving Forward for ANSI/TIA-222-H · Revision H: Key Changes Moving Forward...
Revision H: Key Changes Moving Forward for ANSI/TIA-222-H
Learn about structural engineering services at at www.fdh-is.com
Wind SpeedWind speed maps revised based on newer weather data.
FabricationFabricators for new towers and poles must be certi�ed per AISC 201-06.
Existing Structures 5% overstress allowed for changed conditions on existing structures. Additional 5% capacity gained by using load modi�cation factors in Annex S.
Appurtenances Mounting Systems New speci�cations for analyzing mounts. Annex J addresses mount mapping requirements.
Initial Construction Inspection Inspection must be performed during new construction.
Existing StructuresModification Inspection Inspection must be performed during modi�cation construction.
©2018 FDH Infrastructure Services, LLC
Mapping of Structural Members and Connections Added requirements for bracing o�sets, number of guy cable strands, details of torque arms and guy lugs, porthole welds, and member edge distances, gauges, and coping.
Maintenance and Condition Assessment Added requirements for inspecting weld cracks under radomes/shrouds in concealment sections, obstructions to lighting system, obstructions to climbing path, and safety climb system.
GroundingSpeci�c details provided for con�guration of grounding rods and wires. Revised standard grounding cables from 2/0 AWG to #2 AWG.
ClimbingStrength requirements changed for step bolts, rest platforms, ladders, support rails, safety climb systems, and fall protection anchorage. Installation of appurtenances cannot degrade climbing facility.
Wind Force Coefficient for PolesFor poles without external pieces, force coe�cients reduced by 3% to 25%.
Wind Direction Probability FactorFactor increased from 0.95 to 1.00 for concealment poles.
Ice LoadingIce thickness maps revised based on newer weather data; conversion factor built in.
Seismic LoadingEvery tower must be analyzed for seismic loads. Calculations based on newer ASCE 7-16 standard.
Rooftop Wind Speed Up FactorNew factor required for structures on isolated buildings taller than 50 feet and on buildings 50 feet taller than adjacent buildings.
Ground Elevation FactorNew factor that reduces wind pressure due to lower air density at higher elevations.
AISC Standard Steel calculations based on newer AISC 360-16 standard.
Bolt Shear Strength Changed formula for bolt shear strength with component that depends on connection length.
LOADING
STRENGTH
STRUCTURAL ELEMENTS & APPURTENANCES
