ASCE Manual 91 97:1997 Edition

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Manual of Practice No. 91: Design of Guyed Electrical Transmission Structures

Published By	Publication Date	Number of Pages
ASCE	1997	96

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Description

Guyed structures are commonly used to support electric transmission lines. They generally have the advantage of lightweight, erection ease, pre-assembly, and simple foundation design. There is a considerable range of applications, from simple guyed wood poles to the very large guyed steel latticed structures. This publication describes the various types of guyed structures that have been used; presents typical guys and fittings; illustrates guy anchors and foundations; explores analysis and design techniques specific to guyed structures; discusses unique construction and maintenance problems; and displays both hand and computer calculations to illustrate some of the concepts discussed in the document.

PDF Catalog

PDF Pages	PDF Title
6	Contents
10	Preface
12	Chapter 1 Introduction
14	2 Guyed Structures Configurations 2.1 General
15	2.2 Single Poles or Masts 2.2.1 Guying configurations
16	2.2.2 Pole or mast base
17	2.2.3 Limits of use 2.3 Stub Poles
18	2.4 H-Frames (Multi-Pole Structures)
19	2.5 Rigid Frames 2.5.1 Guyed rigid latticed portal
20	2.5.2 Guyedrigid Y 2.5.3 Guyed delta 2.6 Masted Towers
22	2.6.1 Guyed portal 2.6.2 Guyed V
24	2.6.3 Cross rope 2.6.4 Guyedhinged Y
26	3 Guys and Guy Fittings 3.1 Guy Materials
28	3.2 Guy Fittings
31	3.3 Tensioning Devices
32	4 Guy Anchors and Foundations 4.1 Deadman Anchors
33	4.2 Screw Anchors
34	4.3 Grouted Anchors
38	5 Analysis 5.1 Cable Behavior
42	5.2 Poles or Latticed Masts with Single Guy Attachment Point 5.2.1 Single guy level and hinged base
43	5.2.2 Single guy level and fixed base
47	5.3 Poles or Latticed Masts with Multiple Guy Attachment Points 5.3.1 Multi-guy levels and hinged base
48	5.3.2 Multi-guy levels and fixed base 5.4 Structures with Four Guys
49	5.5 Buckling Strength of Poles and Latticed Masts 5.5.1 Pole buckling strength
51	5.5.2 Equivalent beam model for latticed masts
53	5.6 Computer Modeling 5.6.1 Linear computer analysis
54	5.6.2 Nonlinear computer analysis
55	5.6.3 Modeling hints and details
58	6 Design 6.1 Loadings and Design Restrictions
59	6.2 Guy Clearances 6.2.1 Electrical clearances 6.2.2 Mechanical clearances
60	6.3 Guy Design 6.3.1 Guy pretension
61	6.3.2 Allowable tensions 6.3.3 Guy slope
62	6.4 Guy Anchorage
63	6.5 Connections 6.5.1 Guy connections to poles 6.5.2 Connections in latticed structures
64	6.6 Structural Design of Poles and H-Frames
65	6.7 Structural Design of Latticed Rigid Frames and Masted Towers
66	7 Construction and Maintenance 7.1 Design Considerations 7.2 Construction Considerations
67	7.3 Guyed Poles 7.3.1 Erection methods 7.3.2 Guy installation
68	7.4 Guyed Rigid Frames and Masted Towers 7.4.1 Erection methods 7.4.2 Crane erection
69	7.4.3 Helicopter erection 7.4.4 Guy installation
71	7.5 Erection Tolerances 7.5.1 Guyed poles and H-frames 7.5.2 Guyed rigid frames and masted towers
72	7.6 Inspection and Maintenance
74	8 Examples 8.1 Wood Poles 8.1.1 Dead-end pole with in-line guys in single vertical plane
77	8.1.2 Ninety-degree angle pole with in-line guys
78	8.2 Tubular Steel Poles
79	8.2.1 Bisector guyed pole
81	8.2.2 Effect of guy properties on behavior of pole
83	8.3 GuyedV 8.3.1 Analysis for high wind loads
84	8.3.2 Analysis for unbalanced longitudinal load on outer phase 8.3.3 Analysis for combination of vertical, transverse, and longitudinal loads
85	8.3.4 Design of mast for guyed V
87	8.4 Guyed Delta
90	Appendices A: REFERENCES
92	B: NOTATION
94	Index A B C D E F G H I L
95	M N P R S T U V
96	W X