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ASCE Manual 74 2020

ASCE Manual 74 2020

$81.25

ASCE Manuals and Reports on Engineering Practice 74: Guidelines for Electrical Transmission Line Structural Loading, Fourth Edition

Published By Publication Date Number of Pages
ASCE 2020 324
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Prepared by the Task Committee on Electrical Transmission Line Structural Loading of the Electrical Transmission Structures Committee of the Special Design Issues Technical Administrative Committee of the Structural Engineering Institute of ASCE

Fully revised and updated, Guidelines for Electrical Transmission Line Structural Loading, Fourth Edition, MOP 74, provides the most current and relevant loading concepts and applications specific to transmission line design. A valuable resource for the development of a loading philosophy for electrical transmission structures, the information presented can be applied to an individual project or at a regional level. Key topics addressed in this manual are

  • Uniform procedures and definitions used in the industry for the calculation of loads,
  • Design procedures addressing uniform levels of reliability for transmission lines,
  • Up-to-date techniques for quantifying weather-related loads,
  • Procedures for calculating design loads and determining their corresponding load factors,
  • Updated techniques for quantifying wire system and other non-weather-related loads,
  • Failure containment philosophy, and
  • Practical examples providing more detail on the application of load recommendations.

This Manual of Practice will be an important guide to engineers involved in electrical utility and structural engineering.

PDF Catalog

PDF Pages PDF Title
2 Blank Page
3 Guidelines for Electrical Transmission Line Structural Loading, 4E
7 Contents
11 Preface
15 Acknowledgments
17 1. Overview of Transmission Line Structural Loading
1.0 Introduction
18 1.1 Principal Systems of a Transmission Line
1.1.1 Wire System
19 1.1.2 Structural Support System
20 1.2 Unique Aspects of Transmission Line Design
1.2.1 Tolerance of Failure
21 1.2.2 Designing to Contain Failure
1.2.3 Coordination of Strengths
22 1.2.4 Linear Exposure of Transmission Lines
1.3 Load and Resistance Factor Design (LRFD)
1.3.1 Reliability-Based Design
23 1.3.2 Overview of LRFD
24 1.3.3 Load Factors
1.3.4 Strength Factors
25 1.3.5 Sources for Nominal Strengths
1.3.6 Limit States
26 1.4 Weather-Related Loads
1.4.1 Extreme Winds
1.4.2 High-Intensity Winds
27 1.4.3 Extreme Ice with Concurrent Wind
1.5 Reliability Concepts for Weather-Related Loads
1.5.1 Mean Recurrence Intervals for Weather-Related Loads
29 1.5.2 Relative Reliability and Weather Event MRIs
30 1.5.3 Service Reliability versus Structural Reliability
1.6 Additional Load Considerations
31 1.6.1 Construction and Maintenance
1.6.2 Longitudinal and Failure Containment Loads
32 1.6.3 Earthquake Loads
1.6.4 Legislated Loads
1.6.5 Load Time Signature
33 1.7 Wire System
1.8 Examples
34 1.9 Appendixes
1.10 Draft Prestandard
1.11 Incorporation of Changing Data
35 2. Weather-Related Loads
2.0 Introduction
36 2.1 Wind Loading
2.1.1 Wind Force
37 2.1.2 Air Density Coefficient, Q
2.1.3 Basic Wind Speed
41 2.1.4 Wind Pressure Exposure Coefficient
46 2.1.5 Gust Response Factor
50 2.1.6 Force Coefficient
60 2.1.7 Topographic Effects
64 2.1.8 Application of Wind Loads to Latticed Towers
65 2.2 High-Intensity Winds
2.2.1 Downbursts
67 2.2.2 Tornadoes
72 2.3 Ice and Wind Loading
2.3.1 Introduction
2.3.2 Categories of Icing
73 2.3.3 Design Assumptions for Ice Loading
2.3.4 Ice Accretion on Wires Due to Freezing Rain
81 2.3.5 Ice Accretion on Structural Members
82 2.3.6 Unbalanced Ice Loads
2.3.7 Ice Accretion on Aerial Marker Balls or Similar Devices
85 3. Additional Load Considerations
3.0 Introduction
3.1 Longitudinal Loads, Line Security, and Failure Containment
3.1.1 Longitudinal Loads
86 3.1.2 Unbalanced Loads on Intact Systems
3.1.3 Longitudinal Loads due to Non-Intact Wire Systems
3.1.4 Failure Containment and Line Security Loads
87 3.2 Construction and Maintenance Loads
3.2.1 General
3.2.2 Structure Erection
89 3.2.3 Loads Due to Wire Installation
92 3.2.4 Maintenance Loads
93 3.3 Worker Access and Fall Protection Loads
3.4 Wind-Induced Structure Vibration
94 3.5 Wire Galloping Load Considerations
95 3.5.1 Wire Galloping Loads
96 3.5.2 Galloping Mitigation
3.6 Earthquake Loads
97 3.6.1 Seismic Hazards
98 3.6.2 Siting and Geotechnical Assessment
3.7 Summary of Additional Load Considerations
101 4. Wire System
4.0 Introduction
102 4.1 Tension Section
4.2 Wire Condition
104 4.3 Wire Tension Limits
105 4.4 Calculated Wire Tension
4.4.1 The Ruling Span Method
106 4.4.2 Structural Analysis of a Single Tension Section
4.4.3 Structural Analysis of Multiple Tension Sections
4.4.4 Computational Methods
107 4.5 Loads at Wire Attachment Points
4.5.1 Wire Unit Loads
4.5.2 Using Wind and Weight Spans
111 4.5.3 Weight Spans on Inclined Spans
112 4.5.4 Weight Span Change with Blow-Out on Inclined Spans
114 4.5.5 Centerline Horizontal Angle versus Wire Horizontal Angle
115 5. Examples
5.0 Latticed Suspension Tower Loads
116 5.0.1 Design Data
118 5.0.2 Extreme Wind (Chapter 2, Section 2.1)
120 5.0.3 Wind at 30°: Extreme Wind at 30° Yaw Angle (Chapter 2, Section 2.1)
122 5.0.4 Extreme Radial Glaze Ice with Wind (Chapter 2, Section 2.3)
123 5.0.5 Construction and Maintenance (Chapter 3, Section 3.1)
125 5.0.6 Failure Containment (Chapter 3, Section 3.1.4 and Appendix I, Section 1.3.1)
126 5.1 Weight Span Change with Blowout on Inclined Spans
127 Shield Wire
128 Conductor
129 5.2 Traditional Catenary Constant
Shield Wire
130 Conductor
131 Appendixes
A. Definitions, Notations, and SI Conversion Factors
139 B. Reliability-Based Design
141 C. Air Density Coefficient, Q
143 D. Conversion of Wind Speed Averaging Time
145 E. Supplemental Information on Structure Vibration
149 F. Equations for Gust Response Factors
163 G. Supplemental Information on Force Coefficients
183 H. Supplemental Information on Ice Loading
195 I. Supplemental Information Regarding Longitudinal Loads
211 J. Investigation of Transmission Line Failures
225 K. High-Intensity Winds
261 L. Weather-Related Loads for Additional MRIs
273 M. Draft Pre-Standard Minimum Design Loads for Electrical Transmission Line Facilities
303 References
317 Index

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ASCE Manual 74 2020
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