![]() ![]() Ice to be “considered” when known to occur with wind.First mention of climbing facilities (250 pound load).Installation tolerances introduced (plumb & linearity).Added lateral 400 psf/ft soil strength, 4,000 psf max.Snug tight bolts with a nut-locking device.First recognition of reduced loading with multiple antennas at an elevation.First sketches of ice accumulation treated as cylindrical surfaces.Removed 1/2 inch minimum ice requirement.Higher uniform wind pressures (50-85 psf) for towers 651 ft and higher.Hot-dip galvanizing required for material less than 3/16 inch.Reference to AISC with no 1/3 increase in allowable stresses.Ice applied concurrent with wind on structure and guys.Minimum 1/2 inch of ice required when ice is considered.Wind required on windward and leeward guys.Displacement at guy levels required to be considered.Wind pressures varied with height with pressures from 30 to 70 psf.Sway, twist and displacement limits at 20 psf.Wind pressure 0.0040V^2 (2/3 reduction for rounds).4,000 psf standard soil, 30 degree uplift cone.2/3 reduction for cylindrical surfaces.30 psf over 600 ft structures, all city locations.20 psf up to 600 ft structures, non-city location.1.0 shape factor for closed face (solid).1.5/1.75 shape factor triangular/square towers.ANSI/TIA-222-H Structural Standard for Antenna Supporting Structures, Antennas and Small Wind Turbine Support Structures, 2017.ANSI/TIA-222-G Structural Standard for Antenna Supporting Structures and Antennas, 2005 (G-1, G-2, G-3, G-4).ANSI/TIA/EIA-222-F Structural Standards for Steel Antenna Towers and Antenna Supporting Structures, 1996.ANSI/EIA/TIA-222-E Structural Standards for Steel Antenna Towers and Antenna Supporting Structures, 1991.ANSI/EIA-222-D Structural Standards for Steel Antenna Towers and Antenna Supporting Structures, 1986. ![]() RS-222-C Structural Standards for Steel Antenna Towers and Antenna Supporting Structures, 1976.RS-222-B Structural Standards for Steel Antenna Towers and Antenna Supporting Structures, 1972.RS-222-A Structural Standards for Steel Antenna Towers and Antenna Supporting Structures, 1966.RS-222 Structural Standards for Steel Transmitting Antennas, Supporting Steel Towers (combined TR-116 & RS-194), 1959.RS-194 Microwave Relay System Towers (Supplement to TR-116), 1957. ![]()
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