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