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Communication Structures [Hardback]

  • Formāts: Hardback, 352 pages, height x width x depth: 234x156x25 mm, weight: 626 g
  • Izdošanas datums: 13-May-2006
  • Izdevniecība: Thomas Telford Ltd
  • ISBN-10: 0727734008
  • ISBN-13: 9780727734006
Citas grāmatas par šo tēmu:
  • Hardback
  • Cena: 145,10 €
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  • Pievienot vēlmju sarakstam
  • Formāts: Hardback, 352 pages, height x width x depth: 234x156x25 mm, weight: 626 g
  • Izdošanas datums: 13-May-2006
  • Izdevniecība: Thomas Telford Ltd
  • ISBN-10: 0727734008
  • ISBN-13: 9780727734006
Citas grāmatas par šo tēmu:

This book combines the accumulated knowledge of structural engineers, scientific researchers, mast and tower owners and antenna experts with experience in the analysis, design, construction and operation of communication structures, into one accessible volume.

It introduces the reader to the basis of design, analysis and construction of lattice towers and guyed masts used for communication purposes (radio, television, mobile phones and radar) and looks at new developments and the effects on the industry. The author focuses on the light and wind sensitive structures that support the aerials that make communication services possible and states that the design and construction of these structures involves significant engineering expertise to ensure that they are safe and reliable, yet cost effective and efficient.

A brief history of tall structures is provided and the various types of structure, dictated by their function and/or location are described. The loading on such structures is described and the methods of calculating their response outlined. Dynamic effects from vortex shedding or galloping are outlined, together with detailed guidance on how to minimise these effects and how to assess fatigue life.

The book provides detailed information on:

  • history, design considerations and failures
  • meteorological parameters, wind resistance and strength
  • aerodynamic stability, fatigue, access and safety
  • codes of practice and design standards.

Communication Structures is essential for both the established and the new generation of engineers, telecom administrators, contractors, masts and tower fabricators and related professionals.



Introduces the reader to the basis of design, analysis and construction of lattice towers and guyed masts used for communication purposes (radio, television, mobile phones and radar) and looks at the developments and the effects on the industry. This book is useful for engineers, telecom administrators, contractors, masts and tower fabricators.
Foreword ix
Preface xi
Acknowledgements xiii
Introduction
1(5)
History
6(13)
Design considerations
19(37)
General
19(1)
Choice of site
20(4)
Choice of structure
24(3)
Economic considerations
27(1)
Environmental considerations
27(3)
Electronic considerations
30(24)
General
30(3)
Antenna characteristics
33(4)
Low-frequency antennas
37(4)
Medium-frequency antenna systems
41(3)
VHF and UHF antennas
44(5)
Digital audio broadcasting
49(2)
Mobile phone antennas
51(3)
Effect on existing services of subsequent additional antennas
54(2)
Failures of masts and towers
56(15)
General
56(3)
Icing failures
59(2)
Design/detail failures
61(2)
Maintenance failures
63(2)
Aircraft damage
65(3)
Vandal damage
68(1)
Lessons to be learned
69(2)
Forms of structure
71(22)
General
71(1)
Timber towers
71(1)
Concrete towers
71(4)
Lattice steel towers
75(6)
Lattice guyed masts
81(6)
Tubular guyed masts
87(3)
Concrete guyed masts
90(1)
Other forms of communication structures
91(2)
Meteorological parameters
93(24)
General
93(1)
Wind
93(11)
Wind climate
95(4)
Boundary layer
99(3)
Serviceability wind speeds
102(2)
Atmospheric icing
104(9)
General
104(3)
Physics and theoretical modelling of ice accretion
107(2)
Empirical models to estimate ice loads on structures
109(4)
Earthquakes
113(1)
Temperature
114(1)
Other meteorological aspects
115(2)
Wind resistance
117(30)
General
117(5)
Symmetrical structures without ancillaries
122(6)
Symmetrical structures with limited ancillaries
128(1)
General method for structures containing ancillaries
129(4)
Linear ancillaries
133(1)
Discrete ancillaries
133(1)
Cables
133(1)
Measurements on scale model of communications tower
134(3)
Discrepancy between wind tunnel tests and full-scale measurements
137(3)
Icing
140(7)
Response
147(30)
General
147(1)
Lattice towers
148(2)
Guyed masts
150(27)
General
150(2)
Frequency domain analysis
152(5)
Time domain analysis
157(2)
Simplified methods
159(17)
Summary
176(1)
Strength
177(18)
Introduction
177(1)
Design against buckling -- individual members
178(7)
General
178(2)
Influence of local and torsional buckling
180(1)
Angle leg members
181(1)
Angle bracing members
182(2)
Tubular leg members
184(1)
Tubular bracing members
184(1)
Solid round members
184(1)
Secondary members ('redundants')
185(1)
Bracing types
186(3)
Compound members
189(1)
Tension
190(1)
Connections
190(5)
General
190(1)
Flange joints in tubular or solid round leg members
190(2)
Guy connections
192(3)
Cables
195(15)
General
195(1)
Types of cables
195(7)
Strength of guy ropes
202(1)
Rotational characteristics of steel ropes
202(1)
Modulus of elasticity
203(1)
Prestretching
203(3)
Still air tension
206(1)
Terminations
206(4)
General
206(1)
Types of terminations
207(3)
Aerodynamic stability
210(10)
General
210(1)
Vortex shedding
211(5)
General
211(1)
Background and critical wind speed
211(2)
Practical implications
213(1)
Damping devices
214(2)
Galloping
216(4)
General
216(1)
Critical wind speed
216(3)
Damping devices
219(1)
Fatigue
220(8)
General
220(3)
Lattice towers
223(1)
Lattice masts
223(3)
Guys
226(2)
Foundations
228(11)
General
228(1)
Foundation types
228(11)
Type I: to resist uplift
228(3)
Type II: to resist overturning
231(2)
Type III: to resist down thrust
233(1)
Type IV: guy anchorages
233(6)
Codes and standards
239(7)
History
239(5)
General
239(1)
Wind loading
239(3)
Ice loading
242(1)
Strength
243(1)
Other aspects
243(1)
Current codes
244(2)
General
244(1)
Comparison of current Codes
245(1)
Access and safety
246(5)
General
246(3)
IASS Recommendations for safe access
249(2)
Fabrication and erection
251(13)
Materials and fabrication
251(7)
Steel for towers and mast columns
251(6)
Aluminium
257(1)
Timber
257(1)
Plastics
258(1)
Erection
258(6)
General
258(1)
Erection of lattice towers
259(1)
Erection of guyed masts
259(5)
Maintenance
264(5)
General
264(1)
Constraints
264(1)
Minimizing maintenance at the design stage
265(2)
Manuals
267(2)
Seismic response
269(7)
General
269(1)
Seismicity and earthquake-resistance performance levels
270(1)
Prediction of seismic response of structures
271(4)
General
271(1)
Self-supporting lattice towers
272(1)
Monopoles
273(1)
Guyed masts
273(2)
Antennas and ancillary components
275(1)
Geotechnical considerations
275(1)
Annex A Codes of Practice and Design Standards
276(32)
General
276(1)
Comparisons of National Codes
277(1)
Scope
277(1)
Limit states/reliability classes
277(2)
Wind structure
279(13)
General
279(7)
Wind resistance
286(6)
Ice loading
292(1)
Displacements/serviceability
293(2)
Partial safety factors
295(3)
Strength
298(6)
Compressive strength
298(5)
Tensile strength
303(1)
Steel structure
303(1)
Guys
303(1)
Guy assemblies
304(1)
General
304(1)
Prestretching
304(1)
Terminations
304(1)
Initial tensions
305(1)
Erection
305(1)
Insulators
305(2)
Access
307(1)
Annex B IASS Working Group Number 4: Masts and Towers
308(3)
Brief history
308(1)
Role in the future
308(1)
The members of the Group
309(2)
References 311(16)
Index 327