Guidelinesfor ElectricalTransmission LineStructural Loading
THIRDEDITION
Guidelines for Electrical Transmission Line Structural Loading Third Edition
Prepared bythe Committee on Electrical Transmission Structures theTask Committee on Structural Loadings ofof the Structural Engineering Institute ofthe American Society of Civil Engineers
C.Jerry Wong Edited byMichael D Miller
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Library of Congress Cataloging-in-Publication Data
Guidelines fr electrical trnsision lin strctural loaing /pepared by the TaskoftheStructuralEngineering Intitutef theAericnociey ofCivEngine Committee on Structural Loadings of the Committee on Electrical Transmission Stracturesedited by C. Jerry Wong--3rd ed.
(As developed by the ASCE Technical Procedures Committee July 1930 and revised March 1935 February 1962 and April 1982)
A manual or report in this series consists of an orderly presentation ofand applications of these facts. It contains information useful to theaverage engineer in his or her everyday work rather than findings thats suasue u ou s are o euoseouo yasn aq eu"rule of thumb" for nonengineers.
p. cm.(ASCE manuals and reports on engineering practice ; no. 74)ISBN 978-0-7844-1035-6 (alk. paper) Includes bibliographical references and index.1. Wong C. Jerry. IL American Society of Civil Engineers. Task Committee on 1.Electric linePole and twesDeinan construction2. Load factrdsig.Structural Loadings. TK3242.G77 .31922dc22
2009033203
Furthermore material inthis seriesindistinctionfrom apaperwhichexpresses only one person's observations or opinions) is the work of a mittee or group selected to assemble and express information on aspecific topic. As often as practicable the mittee is under the direction of one or more of the Technical Divisions and Councils and the productevolved has been subjected to review by the Executive Committee of themanuscripts are often brought before the members of the Technical Divi-improvement. When published each work shows the names of the - sions and Counils for ment which may serve as the basis forcesses through which it has passed in review in order that its merit may be definitely understood.
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Copyright 2010 by the American Society of Civil Engineers All Rights Reserved.Manufactured in the United States of America. ISBN 978-0-7844-1035-6
No. Title
40Ground Water Management 5 Conulting Enginoring; A Guide for theEngament f Enginring49 ap Su n Services50 Plaing and Design Guidelines for SemallCral Harboes54 Sedientation Engineering Management Operation and Maintenance of Irigation and60Gravity Sanitary Sewer Design and Drainage Systenspur g 9 CosttndEin Rchabilittion66 67 Structural Plastics Selection Manul Wind Tunnel Studies of Buildings and99 Aeration: A Wastewater Treatment Stractures71AgrillSelinity Aent d Process73 Quality in the Constructed Project A Guide for Owners Designers and74Guideines fr Electrical Trnmission ConstructorsDesign and Construction of Line Struchural Loading Therd Edition771 Urhan Stormwater Management suasigShip Channel Design82Odor Control in Wiastewater Augnent Precipitation84Mechanical Connections in Wood Tretent Plants Structures85 91 Design of Guyed Eectrical Quality of Ground Water92Manhole Inspection and Tramissin Struchres Rehabilittion SecndEdion
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Na.Tit94 Inld Nvigation Locks Dams and 93 g u uo ag a95 97 UrnSburfceD p qdop p Charnels98 Conveyance of Remiduals from Water PracticeGroundwaer Contaminationby and Wastewater Treatment101 UnderwateIvstigations Organic Pollutants: Anlysis and Remediation103 GuidetHiring and Retainng Gret Civil Engineers104 RemendedPractice for Fiber OverheadUtility Line Strctures ReinfordPolymerProducts for105 u puue a peury Lagoons106 107 HorizontalAugerBoringProjects Ship Channel Design and Operation108 Biological Nutrient Remowal (BNR) Pipeline Designfor Instlltionby Horizontal Directional Drilling109 Plants110 Sedinentation EngineringProces Measurements Modeling andⅢ1 o pg Pole Structures Practice112 113 Pipe Bursting Projects Substation Structre Design Guide114 Perlormance-Based Design of Structural Steel foc Pire Conditions115 116 Navigatn Enginering Prctice and Pipe Ramming Projects Ethical Standards117 118 Inpeting Peline Itlleon BelowgroudPipeline Networks for119 Buried Fexible Steel Pipe: Design and sseuy empens Ulity Cables
PREFACE
Since theoriginal publiation ofManual74in1991 and the preceing "Guidelines for Transmission Line Structural Loading” in 1984 thebroadened significantly. However improvements in putational capa- understanding of structural loadings on transmission line structures hasbilityhave enabled the transmissionlineengineer tomoreasily deter-mine structural loadings without properly understanding the parameters that affect these loads. Many seasoned professionals have expressedconcemfortheapparent lackfrecentinformationonthetopicof structural loadings as new engineers enter this industry. The Committee on Electrical Transmission Structures is charged with the responsibility toreport evaluate and provide loading requirements of transmission struc- tures.This task mittee was therefore formed to update and revise the1991 manual.
The remendations presented herein are the consensus opinion ofthe task mittee members.Although the subject matter of this guidehas been thoroughly researched it should be applied only in the context of sound engineering judgment.
for their assistance and contributions to this document: Anthony M. The mittee wishes to thank thePeer Review Committee membersDiGioia (Chair) Mark Allen Alan G. Davenport Elias Ghannoun JohnW. Harrison and Robert Morris. Also the mittee is grateful for the ments and guidance of Leon Kempner J. and Dan Jackman.
Task Committee member Jerome G. Hanson and Peer Review Committee Itiswithmuchappreciationthatweacknowledgethecontributionsofmember John W. Harrison who are no longer with us.
Respectfully submitted Task Committee on Structural Loadings
PREFACE
Harry V.DurdenJames M. McGuireMichael D. Miller
Frank W. AgnewJim Andersen Richard F. AichingerCarl W.AustinRonald J. Carrington Terry G. BurleyMichael S.Cheung Habib J. DagherNicholas J. DeSantis
William Y. Ford Bruce FreimarkJim HoganMagdi Ishac Kathy JonesKishor C. Mehta
John D. MozerRobert E. Nickerson Wesley J. OliphantMark OstendorpLarry Shan Alain PeyrotDavid TennentC. Jerry Wong (Chair) George T. Watson
CONTENTS
FOREWORD ix
1OVERVIEWOFLOAD CRITERIA.
1.0 Introduction ...... /1.1 Principal Systems of a Transmission Line..... 21.2 Loads and Relative Reliability........ 1.3 Wire Systems. . 9 31.4 Limit States Design.. 9
2WEATHER-RELATEDLOADS.... 21
20 Introduction..... 212.1 Extreme Wind. 2.2 High-Intensity Winds 22 4223 Ice and Wind Loading. 49
3ADDITIONALLOAD CONSIDERATIONS.. 59
3.0Introduction 593.1 Construction and Maintenance Loads 5933Longitudinal Loads.... 3.2 Fall Protection Loads....... 62 6335Conductor Galloping. 3.4Structure Vibration.. 67 683.6 Earthquake Load 69
4WIRE SYSTEM. 71
4.0 Introduction ... 714.1 Tension Section... 71
