Contenido Railway Bridge Maintenance

Railway Bridge Maintenance, Second edition provides a thorough overview to assist those involved in the maintenance and management of existing railway bridges, dating from the early nineteenth century to the present, that are essential in supporting railway operations.

The second edition has been updated to reflect the current challenges bridge engineers face in assessing conditions and making informed decisions on cost-effective maintenance, repairs, upgrades and replacements. It also provides support to infrastructure engineers and planners who analyse, interpret and make decisions on large populations of bridge structures as part of the long-term planning and preparation of maintenance budgets.

Railway Bridge Maintenance, Second edition:

• is fully updated to reflect the modern methods of asset management, remote condition monitoring and the use of new materials

• contains over 80 illustration to provide guidance for common defects

• offers a range of case studies where defects and component failures have occurred highlighting causes, repair and future prevention measures.

This book aims to help readers to quickly target the relevant and necessary information to safely deal with the issues encountered in operating a growing railway on an ageing asset stock. Railway Bridge Maintenance, Second edition is essential to engineers, designers and planners involved in any aspect of the design, construction, repair, maintenance and refurbishment of railway bridges

INDEX

Foreword to the second edition
Preface
Acknowledgements
About the author
Introduction

1 Historical records

2 Deterioration

2.1. Exposure and weathering
2.2. Defects arising from faults in design and detail
2.3. Cast iron bridges
2.4. Wrought iron bridges
2.5. Defects arising from faulty materials and workmanship
2.6. Overloading
2.7. Fatigue
2.8. Past neglect
2.9. Bridge strike damage 59
2.10. Other accidental and malicious damage

3. Assessment of strength and carrying capacity

3.1. Assessment
3.2. Assembling information
3.3. Analysis
3.4. Stresses
3.5. Testing
3.6. Capacity and capability
3.7. Special permissions
3.8. Arches
3.9. Tests 71
References

4 .Examination

4.1. Priorities and programming
4.2. Selection and training of bridge examiners
4.3. Preparation for examination
4.4. Intervals between examinations
4.5. Risks to health

5  Preventive maintenance

5.1. Additional material
5.2. Concrete encasement
5.3. Metal coatings
5.4. Painting
5.5. Cathodic protection
5.6. Waterproofing and drainage
5.7. Pointing 1
5.8. Cleaning
5.9. Bird infestation
5.10. Vegetation
5.11. Preservation of timber
References

6 .Economics

6.1. Detailed estimates
6.2. Rough estimates
6.3. Present and future costs
6.4. Comparison of alternatives

7  Asset management

7.1. What is asset management?
7.2. Historic context
7.3. The asset management system
7.4. Asset information
7.5. Optimisation
7.6. Conclusion
Reference

8 Diagnosis and treatment

8.1. Mining subsidence
8.2. Substructures
8.3. Arches
8.4. Superstructures

9 Use of new materials

10 Remote condition monitoring

10.1. What can be measured with discrete sensors?
10.2. Risks and pitfalls: understanding structural behaviour
10.3. Instrumenting for likely structural behaviour
10.4. Monitoring intervals (aliasing
10.5. Relating loss of strength with change in stiffness
10.6. Discrete sensors
10.7. Strain
10.8. Displacement
10.9. Robotic total station survey
10.10. Acceleration

11 Case studies

11.1. Case study 1: GSW 161/244 Enterkin Burn and GSW 161/222 Crawick Viaducts –arch barrel fracture
11.2. Case study 2: NOG1/6 Old Beck Bridge –wing wall failure
11.3. Case study 3: ATL/1296 Denmark Hill overline bridge – failure of concrete encasement
11.4. Case study 4: ECN2 090/080 Invertiel Viaduct – parapet failure
11.5. Case study 5: EGM1 070/130 Cathedral Street overbridge – failure of rolled wrought iron sections
11.6. Case study 6: CEJ 0 m 9.5ch Cardiff spandrel wall failure
11.7. Case study 7: MLN1 106 m 4.5ch Beckford Road overbridge – root jacking of masonry 1

Index