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ASCE Manual74 09 2009

ASCE Manual74 09 2009

$53.08

Manual of Practice No. 74: Guidelines for Electrical Transmission Line Structural Loading

Published By Publication Date Number of Pages
ASCE 2009 204
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Prepared by the Task Committee on Structural Loadings of the Committee on Electrical Transmission Structures of the Structural Engineering Institute of ASCE.

This Manual provides the most relevant and up-to-date information related to transmission line structural loads. The understanding of transmission line structural loads continues to improve as a result of research, testing, and field experience. Updated and revised, this manual covers weather-related loads, relative reliability-based design, and loading specifics applied to prevent cascading types of failures, as well as loads to protect against damage and injury during construction and maintenance. This manual is intended to be a resource that can be readily absorbed into a loading policy.

This Manual will be valuable to engineers involved in utility, electrical, and structural engineering.

PDF Catalog

PDF Pages PDF Title
8 CONTENTS
10 FOREWORD
14 1 OVERVIEW OF LOAD CRITERIA
1.0 Introduction
15 1.1 Principal Systems of a Transmission Line
16 1.2 Loads and Relative Reliability
22 1.3 Wire Systems
1.4 Limit States Design
34 2 WEATHER-RELATED LOADS
2.0 Introduction
2.1 Extreme Wind
55 2.2 High-Intensity Winds
62 2.3 Ice and Wind Loading
72 3 ADDITIONAL LOAD CONSIDERATIONS
3.0 Introduction
3.1 Construction and Maintenance Loads
75 3.2 Fall Protection Loads
76 3.3 Longitudinal Loads
80 3.4 Structure Vibration
81 3.5 Conductor Galloping
82 3.6 Earthquake Load
84 4 WIRE SYSTEM
4.0 Introduction
4.1 Tension Section
85 4.2 Wire Condition
86 4.3 Wire Tension Limits
87 4.4 Calculated Wire Tension
89 4.5 Loads at Wire Attachment Points
93 4.6 Extreme Wind on Wire System
4.7 Combined Wind and Ice on Wire System
94 5 EXAMPLES
5.0 Latticed Suspension Tower Loads
103 5.1 Weight Span Change with Blow-out on Inclined Spans
104 5.2 Traditional Catenary Constant
106 APPENDIX A: DEFINITIONS, NOTATIONS, AND SI CONVERSION FACTORS
112 APPENDIX B: LIMITATIONS OF RELIABILITY-BASED DESIGN
118 APPENDIX C: NUMERICAL CONSTANT, Q
120 APPENDIX D: CONVERSION OF WIND SPEED AVERAGING TIME
122 APPENDIX E: SUPPLEMENTAL INFORMATION ON STRUCTURE VIBRATION
126 APPENDIX F: EQUATIONS FOR GUST RESPONSE FACTORS
132 APPENDIX G: SUPPLEMENTAL INFORMATION ON FORCE COEFFICIENTS
152 APPENDIX H: SUPPLEMENTAL INFORMATION ON ICE LOADING
164 APPENDIX I: SUPPLEMENTAL INFORMATION ON SPECIAL LOADS
176 APPENDIX J: INVESTIGATION OF TRANSMISSION LINE FAILURES
186 REFERENCES
198 INDEX
A
B
C
199 D
E
F
G
200 H
I
J
L
201 M
N
O
P
202 R
S
T
203 U
V
W
204 Y

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ASCE Manual74 09 2009
$53.08