ANSI - NESC Update - Wood Poleswoodpoles.org/portals/2/documents/ANSI_NESC_05.pdf · ANSI - NESC Update Nelson G. Bingel III Chair - ANSI O5 Principal - NESC 2005 AWPA Annual Meeting
Post on 01-Apr-2018
222 Views
Preview:
Transcript
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
NESC - Safety
ANSI O5 - Material
FIBERSTRESS
CLASSLOADS
WOODQUALITY
POLEDIMENSIONS
Lc
D
2 ft
Class 1 4,500 lbClass 2 3,700 lbClass 3 3,000 lbClass 4 2,400 lbClass 5 1,900 lb
Compression (psi)Tension (psi)
Bending Capacity =k x fiber strength x C3 (ft-lb)
Fiber StrengthFiber StressModulus of Rupture
ANSI O5.1
Bending Load = Lc x D (ft-lb)
Lc
k x fiber strength x C3 (ft-lb)
ANSI O5.1
Bending Capacity
= k x fiber strength x C3 (ft-lb)k x fiber strength x C3 (ft-lb)
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
Scope Scope
Simple Cantilever
Single Pole Transverse
Scope Scope
Taller PolesTaper
Maximum Stress Point May Occur Above Ground
Fiber Stress Height Effect
Height of Applied Loads
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
#40
Symmetrical Bell Curve Distribution
COV
8000 psi6400 psi 9600 psi
Scope, Section 9, Table 1 Scope, Section 9, Table 1
Taller PolesTaper
Fiber Stress Height Effect
Height of Applied Loads Maximum Stress Point
May Occur Above Ground
Mean Fiber Stress,COV, Conditioned
Net Result of ChangesNet Result of Changes
Distribution – Little Change
Transmission – Maybe Larger Poles
Conservative
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
CA
TX
NY
FL
IL
PA
OH
MI
NJ
GA
NC
VA
MA
IN
WA
TN
MO
WI
MD
AZ
MN
LA
AL
CO
KY
SCOK
OR
CT
IA
MS
KS
AR
UTNV
NM
WV
NE
ID
ME
NH
RI
MT
DE
SD
ND
VT
DC
WY
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
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
Oversize at Guy Attachments
Oversize at Guy Attachments
ANSI Dimension Data CollectionANSI Dimension Data Collection
>Class Oversize
+Fiber Stress
Height Reduction
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
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”
Photo ManualPhoto Manual
Tropical Hardwood PolesTropical Hardwood Poles
Amazon Region in BrazilAmazon Region in Brazil
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
Tropical Hardwood CrossarmsTropical Hardwood Crossarms
OSU Through-Boring ProjectOSU Through-Boring Project
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
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
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
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
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 variousspecies meeting the requirements of ANSI O5.1-2002 shall bedetermined by multiplying the designated fiber stress(recognizing the “fiber stress height effect” as appropriate) setforth in that standard by the appropriate strength factors in Table2610-1A or 261-1B.
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.
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
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
Grade B Grade C
Strength factors for use with loads of Rule 250B
Metal and Prestressed-Concrete Structures 6 1.0 1.0Wood and Reinforced-Concrete Structures 2,4 0.65 0.85Fiber-Reinforced Polymer Structures 6 1.0 1.0Support Hardware 1.0 1.0Guy Wire 5,6 0.9 0.9Guy 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 1.0Wood and Reinforced-Concrete Structures 3,4 0.75 0.75Fiber-Reinforced Polymer Structures 6 1.0 1.0Support Hardware 1.0 1.0Guy Wire 5,6 0.9 0.9Guy 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
Average Strength of 3 PolesAverage Strength of 3 Poles Accepted to Delete this Rule Accepted to Delete this Rule
Delete Alternate OL for WoodDelete Alternate OL for Wood Accepted – Delete Table 253-2 Accepted – Delete Table 253-2
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
top related