ANSI - NESC Update
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Transcript of ANSI - NESC Update
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ANSI - NESC UpdateANSI - NESC Update
Nelson G. Bingel IIIChair - ANSI O5Principal - NESC
Nelson G. Bingel IIIChair - ANSI O5Principal - NESC
2005 AWPA Annual Meeting New Orleans, LA May 15 - 18
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NESC - SafetyNESC - Safety
ANSI O5 - MaterialANSI O5 - Material
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FIBERFIBERSTRESSSTRESS
CLASSCLASSLOADSLOADS
WOODWOODQUALITYQUALITY
POLEPOLEDIMENSIONDIMENSION
SS
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LL
c c
DD
2 ft2 ft
Class 1 4,500 Class 1 4,500 lblbClass 2 3,700 Class 2 3,700 lblbClass 3 3,000 Class 3 3,000 lblbClass 4 2,400 Class 4 2,400 lblbClass 5 1,900 Class 5 1,900 lblb
Compression (psi)Tension (psi)
Bending Capacity =Bending Capacity =
kk xx fiber strength fiber strength xx C C33 (ft-lb) (ft-lb)
Fiber StrengthFiber StressModulus of Rupture
ANSI O5.1 ANSI O5.1
Bending Load = LBending Load = Lc c xx D (ft- D (ft-lb)lb)
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LL
cc
kk xx fiber strength fiber strength xx C C33 (ft- (ft-lb)lb)
ANSI O5.1 ANSI O5.1
Bending Bending Capacity Capacity
== kk xx fiber strengthfiber strength xx C C33 (ft- (ft-lb)lb)
kk xx fiber strengthfiber strength xx CC33 (ft- (ft-lb)lb)
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2002 ANSI O5.1 2002 ANSI O5.1
Changes in Scope
Changes to Table 1, Fiber Stress
Annex A moved into the Standard
Changes in Scope
Changes to Table 1, Fiber Stress
Annex A moved into the Standard
Issued in March 2002Issued in March 2002
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Scope Scope
Simple Cantilever Simple Cantilever
Single PoleSingle Pole TransverTransverse se
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Scope Scope
Taller Taller PolesPoles TaperTaper
Maximum Stress Point Maximum Stress Point May Occur Above May Occur Above
GroundGroundFiber Stress Fiber Stress Height EffectHeight Effect
Height of Height of Applied LoadsApplied Loads
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Table 1 – Fiber StressesTable 1 – Fiber Stresses
Eliminate Species not Used
New Footnote 1• The effects of conditioning on fiber stress have
been accounted for in Table 1 values
New Footnote 2• These designated fiber stresses represent a
mean, groundline, fiber stress value with a COV = .20
Eliminate Species not Used
New Footnote 1• The effects of conditioning on fiber stress have
been accounted for in Table 1 values
New Footnote 2• These designated fiber stresses represent a
mean, groundline, fiber stress value with a COV = .20
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#40
Symmetrical Bell Curve Symmetrical Bell Curve DistributionDistribution
COV
8000 psi6400 psi 9600 psi
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Scope, Section 9, Table 1 Scope, Section 9, Table 1
Taller Taller PolesPoles TaperTaper
Fiber Stress Fiber Stress Height EffectHeight Effect
Height of Height of Applied LoadsApplied Loads Maximum Stress Point Maximum Stress Point
May Occur Above May Occur Above GroundGround
Mean Fiber Mean Fiber Stress,Stress,
COV, ConditionedCOV, Conditioned
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Net Result of ChangesNet Result of Changes
Distribution – Little Distribution – Little ChangeChange
Transmission – Maybe Larger Transmission – Maybe Larger PolesPoles
Conservative
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ANSI Task Force - 2004• Todd Brown
• Martin Rollins
• Nelson Bingel
• Stephen Smith
• Bob Reisdorff
ANSI Task Force - 2004• Todd Brown
• Martin Rollins
• Nelson Bingel
• Stephen Smith
• Bob Reisdorff
Pole Dimension Data CollectionPole Dimension Data Collection
• Martin Rollins• Martin Rollins
• Todd Brown• Todd Brown
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?
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TX
MO
MN
LA
OK
I A
KS
AR
NE
SD
ND
Sample Locations
Coastal Douglas Fir (8)
Coastal DF & Western Red (3)
Northern Red Pine (3)
Southern Yellow Pine (16)
Western Red Cedar (5)
ANSI Dimension Data CollectionANSI Dimension Data Collection
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Coastal Douglas fir 6,185 poles• 9 Producers; 11 Locations
Southern Yellow Pine 5,429 poles• 11 Producers; 16 Locations
Western Red Cedar 5,701 poles• 5 Producers; 9 Locations
Northern Red Pine 2,122 poles• 2 Producers; 3 Locations
Coastal Douglas fir 6,185 poles• 9 Producers; 11 Locations
Southern Yellow Pine 5,429 poles• 11 Producers; 16 Locations
Western Red Cedar 5,701 poles• 5 Producers; 9 Locations
Northern Red Pine 2,122 poles• 2 Producers; 3 Locations
ANSI Dimension Data CollectionANSI Dimension Data Collection
Grand Total 19,527 poles
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Oversize at
Guy Attachments
Oversize at
Guy Attachments
ANSI Dimension Data CollectionANSI Dimension Data Collection
>Class OversizeClass Oversize
++
Fiber Stress Fiber Stress Height ReductionHeight Reduction
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Change ProposalsChange Proposals 1 Scope and general requirements
• Remove design considerations from 1.1 Scope
• Create 1.3 Design Considerations
• Explain maximum stress point more clearly
• State that fiber stress height reduction need not apply to poles 55 feet and shorter
• State that fiber stress height reduction need not apply to braced H-frames due to load sharing
1 Scope and general requirements
• Remove design considerations from 1.1 Scope
• Create 1.3 Design Considerations
• Explain maximum stress point more clearly
• State that fiber stress height reduction need not apply to poles 55 feet and shorter
• State that fiber stress height reduction need not apply to braced H-frames due to load sharing
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Change Proposals cont’dChange Proposals cont’d
Section 9 Fiber stress height effect
• Modify to apply only to poles 60 feet and taller
Section 6.2.1
• Add to the end of the first sentence:o “after bark removal and /or shaving”
Section 9 Fiber stress height effect
• Modify to apply only to poles 60 feet and taller
Section 6.2.1
• Add to the end of the first sentence:o “after bark removal and /or shaving”
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Photo ManualPhoto Manual
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Tropical Hardwood PolesTropical Hardwood Poles
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Amazon Region in BrazilAmazon Region in Brazil
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Tropical Hardwood PolesTropical Hardwood Poles
Task Force to Review Test Data• David D’Hooge• Bob Kluge• Art Peralta• Gina Cerda• Martin Rollins• Jeff Morrell
Nelson Bingel to coordinate the effort
Task Force to Review Test Data• David D’Hooge• Bob Kluge• Art Peralta• Gina Cerda• Martin Rollins• Jeff Morrell
Nelson Bingel to coordinate the effort
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Tropical Hardwood CrossarmsTropical Hardwood Crossarms
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OSU Through-Boring ProjectOSU Through-Boring Project
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Computer Finite Element Analysis
Compare impact on pole strength• Hole size• Hole spacing• Hole distance from pole edge
Test Procedure
Build Test Stand
Obtain Poles
Pole Testing
Computer Finite Element Analysis
Compare impact on pole strength• Hole size• Hole spacing• Hole distance from pole edge
Test Procedure
Build Test Stand
Obtain Poles
Pole Testing
OSU Through-Boring ProjectOSU Through-Boring Project
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Industry Standard Drilling Pattern
Understanding of Strength Impact• Coordinate with ANSI O5
ANSI O5 to coordinate with AWPA • Review treatment effectiveness
Industry Standard Drilling Pattern
Understanding of Strength Impact• Coordinate with ANSI O5
ANSI O5 to coordinate with AWPA • Review treatment effectiveness
OSU Through-Boring Project OSU Through-Boring Project
Results / Additional Standard Activity
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CP 2737 – Major RevisionCP 2737 – Major Revision
Conditionally Accepted
Pending Results of Task Force 5.2.1
Some Concepts
• New Ice & Wind Map – ASCE 7
• Apply Extreme Wind to all Structures
• Include .87 Grade C Strength Factor
• Grade B / C differential @ 1.5
Conditionally Accepted
Pending Results of Task Force 5.2.1
Some Concepts
• New Ice & Wind Map – ASCE 7
• Apply Extreme Wind to all Structures
• Include .87 Grade C Strength Factor
• Grade B / C differential @ 1.5
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60 ft Exclusion Limit60 ft Exclusion Limit Eliminate exclusion but calibrate to previous
practice.
Only partially accomplished
Increase in Medium Loading District
Requires utilities to consider additional load case
Eliminate exclusion but calibrate to previous practice.
Only partially accomplished
Increase in Medium Loading District
Requires utilities to consider additional load case
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Incorporate 2002 ANSI O5.1Incorporate 2002 ANSI O5.1
Rule 261 A2b(1)• Include reference to “fiber stress height
effect”
Rule 261 A2b(1)• Include reference to “fiber stress height
effect”
b. Permitted Stress Level(1)Natural Wood PoleThe permitted stress level of natural grown wood poles of various species meeting the requirements of ANSI O5.1-2002 shall be determined by multiplying the designated fiber stress (recognizing the “fiber stress height effect” as appropriate) set forth in that standard by the appropriate strength factors in Table 2610-1A or 261-1B.
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Incorporate 2002 ANSI O5.1Incorporate 2002 ANSI O5.1
Rule 261 A2b(1)• Include reference to fiber stress height
effect Rule 261 A2a exception 1
• Delete because of reference to allowable groundline stress
Rule 261 A2b(1)• Include reference to fiber stress height
effect Rule 261 A2a exception 1
• Delete because of reference to allowable groundline stress
EXCEPTION 1: When installed, naturally grown wood poles acting as single-based structures or unbraced multiple-pole structures, shall meet the requirements of Rule 261A2a without exceeding the permitted stress level at the ground line for unguyed poles or at the points of attachment for guyed poles.
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Introduce ASCE RBD ManualIntroduce ASCE RBD Manual
Three variations submitted• Refer to the manual• 2 new rules including the manuals• Major rewrite incorporating the manual
All Rejected• Manual only addresses single, un-guyed• Not a consensus document• Several “To Be Determined” values
Three variations submitted• Refer to the manual• 2 new rules including the manuals• Major rewrite incorporating the manual
All Rejected• Manual only addresses single, un-guyed• Not a consensus document• Several “To Be Determined” values
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Introduce FRP StructuresIntroduce FRP Structures Accepted
• Several Rules affected
• Same Strength & Load Factors as Metal
• 5% LEL Strength Established by Manufacturers
Accepted
• Several Rules affected
• Same Strength & Load Factors as Metal
• 5% LEL Strength Established by Manufacturers
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Grade B Grade C
Strength factors for use with loads of Rule 250B
Metal and Prestressed-Concrete Structures 6 1.0 1.0
Wood and Reinforced-Concrete Structures 2,4 0.65 0.85
Fiber-Reinforced Polymer Structures 6 1.0 1.0
Support Hardware 1.0 1.0
Guy Wire 5,6 0.9 0.9
Guy Anchor and Foundation 6 1.0 1.0
Strength factors for use with loads of Rule 250C
Metal and Prestressed-Concrete Structures 6 1.0 1.0
Wood and Reinforced-Concrete Structures 3,4 0.75 0.75
Fiber-Reinforced Polymer Structures 6 1.0 1.0
Support Hardware 1.0 1.0
Guy Wire 5,6 0.9 0.9
Guy Anchor and Foundation 6 1.0 1.0
Table 261-1AStrength Factors for Structures, Crossarms, Support Hardware,
Guys, Foundations, and Anchors for Use with Overload Factors of Table 253-1
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Average Strength of 3 PolesAverage Strength of 3 Poles Accepted to Delete this Rule Accepted to Delete this Rule
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Delete Alternate OL for WoodDelete Alternate OL for Wood Accepted – Delete Table 253-2 Accepted – Delete Table 253-2
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ANSI - NESC UpdateANSI - NESC Update
Nelson G. Bingel IIIChair - ANSI O5Principal - NESC
Nelson G. Bingel IIIChair - ANSI O5Principal - NESC
2005 AWPA Annual Meeting New Orleans, LA May 15 - 18