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National Wood Pole Standards

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National Wood Pole Standards National Wood Pole Standards • Nelson G. Bingel III • ASC O5 Chairman • NESC Chairman President (678) 850-1461 [email protected] 1 Benefits of Wood as a Utility Pole Material • Long-Life Span • ~45 years national average without remedial treatment • Lowest cost • Both initial and full life-cycle costs • Proven Performance • “Go to” overhead line construction material since the early 1900’s • Climb-ability • Ability to service attachments without heavy equipment 2 Benefits of Wood as a Utility Pole Material • Supply Chain is Proven • Even in natural disaster events where demand is high, the wood pole industry has provided poles in required timeline. • Beneficial Physical Properties • Good insulator, resilience to wind and mechanical impacts • Easy Maintenance and Modification in service • “Green” • a treated wood pole has a reduced environmental impact when compared to other utility pole materials. • A renewable and plentiful resource “10 Features Often Overlooked About the Extraordinary Wood Pole.” North American Wood Pole Council. www.woodpoles.org 3 ANSI American National Standards Institute 4 ANSI American National Standards Institute ANSI accredits the procedures of standards developing organizations 5 ANSI American National Standards Institute ANSI accredits the procedures of standards developing organizations National consensus standards 6 ANSI American National Standards Institute ANSI accredits the procedures of standards developing organizations National consensus standards Openness, balance, consensus and due process 7 American Standards Committee O5 –ASC O5 American National Standards Institute American Standards Committee O5 USERS PRODUCERS GENERAL INTEREST 8 National Wood Pole Standards ASC O5 NESC Accredited Standards Committee O5: Standards for Wood Utility Structures • Secretariat: AWPA • Revised: 5 year cycle • Founded in 1924 9 ASC O5 Standards Poles Glu-Lam Crossarms O5.4 - 2009 Naturally Durable Hardwood Poles O5.5 - 2010 Wood Ground Wire Moulding O5.6 - 2010 Solid Sawn Naturally Durable Hardwood Crossarms & Braces O5.TR.01-2004 Photographic Manual of Wood Pole Characteristics 10 http://asco5.org/standards/ 11 http://asco5.org/standards/ 12 Scope Single Pole 13 Scope Simple Cantilever Single Pole 14 Scope Simple Cantilever Transverse Single Pole 15 Scope Simple Cantilever Transverse Single Pole Groundline 16 Maximum Stress Point Solid, Round, Tapered, Cantilever Load (Wind Force on Wires, Equip., etc.) 17 Maximum Stress Point Solid, Round, Tapered, Cantilever Load (Wind Force on Wires, Equip., etc.) Max Stress @ 1.5 Diameter Load Point 18 Maximum Stress Point Solid, Round, Tapered, Cantilever Load (Wind Force on Wires, Equip., etc.) Max Stress @ 1.5 Diameter Load Point Distribution Usually Groundline 19 Maximum Stress Point Solid, Round, Tapered, Cantilever Load (Wind Force on Wires, Equip., etc.) Max Stress @ 1.5 Diameter Load Point Distribution Usually Groundline 20 ANSI O5.1 – Wood Poles Wood Quality 21 ANSI O5.1 – Wood Poles Wood Quality Class Fiber Pole Loads Strength Dimensions 22 Wood Quality • Allowable knots 23 Wood Quality • Sweep 24 Wood Quality • Growth Rings 25 Pole Marking & Code Letters 26 Pole Marking & Code Letters 27 Transverse Wind Loads Ice 28 Class Loads Horizontal 2 ft Class Load (lb) 10 370 Lc 9 740 7 1,200 6 1,500 5 1,900 4 2,400 3 3,000 2 3,700 1 4,500 H1 5,400 H2 6,400 H3 7,500 H4 8,700 H5 10,000 H6 11,400 29 General Class Load Applications Horizontal General 2 ft Class Load (lb) Industry Use 10 370 Lc 9 740 Telecom Only Poles 7 1,200 6 1,500 5 1,900 4 2,400 Distribution 3 3,000 2 3,700 1 4,500 H1 5,400 H2 6,400 Transmission H3 7,500 H4 8,700 H5 10,000 H6 11,400 30 Strengths are Average Values 31 Wood vs. Steel Variability ASCE Manual and Reports on Engineering Practice No. 141 32 Applied Bending Load 2 ft Lc Class 1 4,500 lb Class 2 3,700 lb Class 3 3,000 lb Class 4 2,400 lb Class 5 1,900 lb 33 Applied Bending Load 2 ft Lc D Class 1 4,500 lb Class 2 3,700 lb Class 3 3,000 lb Class 4 2,400 lb Class 5 1,900 lb 34 Applied Bending Load 2 ft Lc Applied Bending Load = Lc x D (ft-lb) D Class 1 4,500 lb Class 2 3,700 lb Class 3 3,000 lb Class 4 2,400 lb Class 5 1,900 lb 35 L x D = Bending Moment (ft-lb) 40 ft Class 4 2400 lb 32 ft 76,800 ft-lb 36 L x D = Bending Moment (ft-lb) 50 ft Class 4 40 ft Class 4 2400 lb 2400 lb 41 ft 32 ft 76,800 ft-lb 98,400 ft-lb 37 Fiber Strength Lc 38 Fiber Strength Lc Tension Compression (psi) (psi) 39 Fiber Strength Lc Tension Compression Fiber Strength (psi) (psi) 40 Fiber Strength Lc Bending Capacity = k x fiber strength x C3 (ft-lb) Tension Compression Fiber Strength (psi) (psi) 41 Circumference3 Effect 3 MG/L = .000264 x Fiber Stress x Circumference 34” 26” 37,120 ft-lb 83,010 ft-lb Circumference Increase - 30% Bending Capacity Increase - 123% 42 Circumference3 Effect 3 MG/L = .000264 x Fiber Strength x Circumference 34” 26” 37,120 ft-lb 83,010 ft-lb Circumference Increase - 30% Bending Capacity Increase - 123% 43 Circumference3 Effect 3 MG/L = .000264 x Fiber Strength x Circumference 34” 26” 80-90% Pole’s Bending Strength In The Outer 2-3” Of Shell! 37,120 ft-lb 83,010 ft-lb Circumference Increase - 30% Bending Capacity Increase - 123% 44 Table 1 – Designated Fiber Strength 45 Table 1 – Designated Fiber Strength Group A Air Seasoning 46 Table 1 – Designated Fiber Strength Group A Air Seasoning Group B Boulton Drying 47 Table 1 – Designated Fiber Strength Group A Air Seasoning Group B Boulton Drying Group C Steam Conditioning 48 Table 1 – Designated Fiber Strength Group A Air Seasoning Group B Boulton Drying Group C Steam Conditioning Group D Kiln Drying 49 Table 1 – Designated Fiber Strength Southern Yellow Pine 8,000 psi Douglas fir 8,000 psi Western red cedar 6,000 psi 50 Pole Species 51 Pole Species 52 Pole Species Distribution: Southern Yellow Pine Transmission: Douglas fir Western red cedar Southern Pine 53 Pole Species Distribution: Douglas fir Distribution: Southern Yellow Pine Transmission Douglas fir Transmission: Western red cedar Douglas fir Western red cedar Southern Pine 54 Table 1 – Designated Fiber Strength 55 Table 1 – Designated Fiber Strength 1) The effects of conditioning on fiber strength have been accounted for in the Table 1 values provided that conditioning was performed within the limits herein prescribed. 56 Table 1 – Designated Fiber Strength 1) The effects of conditioning on fiber strength have been accounted for in the Table 1 values provided that conditioning was performed within the limits herein prescribed. 4) The designated fiber strength represents a mean, groundline, fiber strength value with a coefficient of variation equal to 0.20. 57 Through-boring 58 Oregon State University -Through-Boring Project- 59 60 61 Through-boring 62 Table 1 – Designated Fiber Strength 1) The effects of conditioning on fiber strength have been accounted for in the Table 1 values provided that conditioning was performed within the limits herein prescribed. 4) The designated fiber strength represents a mean, groundline, fiber strength value with a coefficient of variation equal to 0.20. 5) Where Douglas-fir (coastal or Interior North) are through-bored prior to treatment, to account for the process, the designated fiber strength shall be reduced 5% to 7600 psi. 63 2017 Table 1 added MOE 64 2017 Table 1 added MOE 65 2017 Table 1 added MOE 1) The fiber strength and MOE values in Table 1 apply to wood utility poles meeting this standard. The effects of conditioning on fiber strength and MOE have been accounted for …….. 66 2017 Table 1 added MOE 1) The fiber strength and MOE values in Table 1 apply to wood utility poles meeting this standard. The effects of conditioning on fiber strength and MOE have been accounted for …….. 7) The Modulus of Elasticity (MOE) represents a mean value. 67 Circumference Dimensions 6ft G/L TIP 68 Circumference Dimensions 6ft G/L TIP Bending Capacity = k x fiber strength x C3 (ft-lb) 69 Circumference Dimension Tables 70 Circumference Dimension Tables 71 Circumference Dimension Tables 1) The figures in this column are not recommended embedment depths; rather, these values are intended for use only when a definition of groundline is necessary in order to apply requirements relating to scars, straightness, etc. 72 Circumference Dimension Tables 73 Annex B: Groundline Stresses 74 Annex B: Groundline Stresses Minimum circumferences specified at 6 feet from the butt Were calculated so each species in a given class Can support the class horizontal load applied 2 ft from the tip 75 Annex B: Groundline Stresses Minimum circumferences specified at 6 feet from the butt Were calculated so each species in a given class Can support the class horizontal load applied 2 ft from the tip Applied Bending Load = Lc x D (ft-lb) 76 Annex B: Groundline Stresses Minimum circumferences specified at 6 feet from the butt Were calculated so each species in a given class Can support the class horizontal load applied 2 ft from the tip Applied Bending Load = Bending Capacity = 3 Lc x D (ft-lb) k x fiber strength x C (ft-lb) 77 Pole Dimension Table Southern Pine and Douglas Fir (in) 78 78 Pole Dimension Table Southern Pine and Douglas Fir (in) 79 79 Pole Dimension Table Southern Pine and Douglas Fir (in) 80 80 Pole Dimension Table Southern Pine and Douglas Fir Applied Bending Load= Class Load * Distance 76,800 ft-lbs= 2,400 lbs* 32ft (in) 81 81 Pole Dimension Table Southern Pine and Douglas Fir Applied Bending Load= Class Load * Distance 76,800 ft-lbs= 2,400 lbs* 32ft (in) Bending Capacity = k x fiber strength x C3 79,401 ft-lbs= .000264
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