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ASCE Manuals and Reports on Engineering Practice 74: Guidelines for Electrical Transmission Line Structural Loading, Fourth Edition, 2020
- Guidelines for Electrical Transmission Line Structural Loading, 4E [Go to Page]
- Contents
- Preface
- Acknowledgments
- 1. Overview of Transmission Line Structural Loading [Go to Page]
- 1.0 Introduction
- 1.1 Principal Systems of a Transmission Line [Go to Page]
- 1.1.1 Wire System
- 1.1.2 Structural Support System
- 1.2 Unique Aspects of Transmission Line Design [Go to Page]
- 1.2.1 Tolerance of Failure
- 1.2.2 Designing to Contain Failure
- 1.2.3 Coordination of Strengths
- 1.2.4 Linear Exposure of Transmission Lines
- 1.3 Load and Resistance Factor Design (LRFD) [Go to Page]
- 1.3.1 Reliability-Based Design
- 1.3.2 Overview of LRFD
- 1.3.3 Load Factors
- 1.3.4 Strength Factors
- 1.3.5 Sources for Nominal Strengths
- 1.3.6 Limit States
- 1.4 Weather-Related Loads [Go to Page]
- 1.4.1 Extreme Winds
- 1.4.2 High-Intensity Winds
- 1.4.3 Extreme Ice with Concurrent Wind
- 1.5 Reliability Concepts for Weather-Related Loads [Go to Page]
- 1.5.1 Mean Recurrence Intervals for Weather-Related Loads
- 1.5.2 Relative Reliability and Weather Event MRIs
- 1.5.3 Service Reliability versus Structural Reliability
- 1.6 Additional Load Considerations [Go to Page]
- 1.6.1 Construction and Maintenance
- 1.6.2 Longitudinal and Failure Containment Loads
- 1.6.3 Earthquake Loads
- 1.6.4 Legislated Loads
- 1.6.5 Load Time Signature
- 1.7 Wire System
- 1.8 Examples
- 1.9 Appendixes
- 1.10 Draft Prestandard
- 1.11 Incorporation of Changing Data
- 2. Weather-Related Loads [Go to Page]
- 2.0 Introduction
- 2.1 Wind Loading [Go to Page]
- 2.1.1 Wind Force
- 2.1.2 Air Density Coefficient, Q
- 2.1.3 Basic Wind Speed
- 2.1.4 Wind Pressure Exposure Coefficient
- 2.1.5 Gust Response Factor
- 2.1.6 Force Coefficient
- 2.1.7 Topographic Effects
- 2.1.8 Application of Wind Loads to Latticed Towers
- 2.2 High-Intensity Winds [Go to Page]
- 2.2.1 Downbursts
- 2.2.2 Tornadoes
- 2.3 Ice and Wind Loading [Go to Page]
- 2.3.1 Introduction
- 2.3.2 Categories of Icing
- 2.3.3 Design Assumptions for Ice Loading
- 2.3.4 Ice Accretion on Wires Due to Freezing Rain
- 2.3.5 Ice Accretion on Structural Members
- 2.3.6 Unbalanced Ice Loads
- 2.3.7 Ice Accretion on Aerial Marker Balls or Similar Devices
- 3. Additional Load Considerations [Go to Page]
- 3.0 Introduction
- 3.1 Longitudinal Loads, Line Security, and Failure Containment [Go to Page]
- 3.1.1 Longitudinal Loads
- 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
- 3.2 Construction and Maintenance Loads [Go to Page]
- 3.2.1 General
- 3.2.2 Structure Erection
- 3.2.3 Loads Due to Wire Installation
- 3.2.4 Maintenance Loads
- 3.3 Worker Access and Fall Protection Loads
- 3.4 Wind-Induced Structure Vibration
- 3.5 Wire Galloping Load Considerations [Go to Page]
- 3.5.1 Wire Galloping Loads
- 3.5.2 Galloping Mitigation
- 3.6 Earthquake Loads [Go to Page]
- 3.6.1 Seismic Hazards
- 3.6.2 Siting and Geotechnical Assessment
- 3.7 Summary of Additional Load Considerations
- 4. Wire System [Go to Page]
- 4.0 Introduction
- 4.1 Tension Section
- 4.2 Wire Condition
- 4.3 Wire Tension Limits
- 4.4 Calculated Wire Tension [Go to Page]
- 4.4.1 The Ruling Span Method
- 4.4.2 Structural Analysis of a Single Tension Section
- 4.4.3 Structural Analysis of Multiple Tension Sections
- 4.4.4 Computational Methods
- 4.5 Loads at Wire Attachment Points [Go to Page]
- 4.5.1 Wire Unit Loads
- 4.5.2 Using Wind and Weight Spans
- 4.5.3 Weight Spans on Inclined Spans
- 4.5.4 Weight Span Change with Blow-Out on Inclined Spans
- 4.5.5 Centerline Horizontal Angle versus Wire Horizontal Angle
- 5. Examples [Go to Page]
- 5.0 Latticed Suspension Tower Loads [Go to Page]
- 5.0.1 Design Data
- 5.0.2 Extreme Wind (Chapter 2, Section 2.1)
- 5.0.3 Wind at 30°: Extreme Wind at 30° Yaw Angle (Chapter 2, Section 2.1)
- 5.0.4 Extreme Radial Glaze Ice with Wind (Chapter 2, Section 2.3)
- 5.0.5 Construction and Maintenance (Chapter 3, Section 3.1)
- 5.0.6 Failure Containment (Chapter 3, Section 3.1.4 and Appendix I, Section 1.3.1)
- 5.1 Weight Span Change with Blowout on Inclined Spans [Go to Page]
- Shield Wire
- Conductor
- 5.2 Traditional Catenary Constant [Go to Page]
- Shield Wire
- Conductor
- Appendixes [Go to Page]
- A. Definitions, Notations, and SI Conversion Factors
- B. Reliability-Based Design
- C. Air Density Coefficient, Q
- D. Conversion of Wind Speed Averaging Time
- E. Supplemental Information on Structure Vibration
- F. Equations for Gust Response Factors
- G. Supplemental Information on Force Coefficients
- H. Supplemental Information on Ice Loading
- I. Supplemental Information Regarding Longitudinal Loads
- J. Investigation of Transmission Line Failures
- K. High-Intensity Winds
- L. Weather-Related Loads for Additional MRIs
- M. Draft Pre-Standard Minimum Design Loads for Electrical Transmission Line Facilities
- References
- Index
- Blank Page [Go to Page]
