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Railroad Track Mechanics and Technology
Proceedings of a Symposium Held at Princeton University, April 21 - 23, 1975
1st Edition - January 1, 1978
Editor: Arnold D. Kerr
eBook ISBN:9781483188218
9 7 8 - 1 - 4 8 3 1 - 8 8 2 1 - 8
Railroad Track Mechanics and Technology is a collection of paper that discusses the advancement in the various areas of railroad track technology. The title’s emphasis is on… Read more
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Railroad Track Mechanics and Technology is a collection of paper that discusses the advancement in the various areas of railroad track technology. The title’s emphasis is on tackling the concerns that revolve around the track-train interaction. The first part of the text presents the articles about general topics, which include the FRA track research program and balanced national transportation budget. Next, the selection presents the technical materials, such as railroad track structure for high-speed lines; cause and effects of wheel load variation on the high-speed operating line; and the effect of lateral loads on track movement. The book will be of great use to the engineers and technicians who work in rail way transportation industry.
PREFACE
INTRODUCTION
SYMPOSIUM PROGRAM
GENERAL PAPERS
Chapter 1: GETTING DOWN TO BASICS
Publisher Summary
Chapter 2: THE FRA TRACK RESEARCH PROGRAM: ITS ORIGIN AND DEVELOPMENT
Publisher Summary
INTRODUCTION
LEGISLATIVE MANDATE FOR FEDERAL RAILROAD RESEARCH
EVOLUTION OF THE TRACK RESEARCH PROGRAM
IDENTIFICATION OF OBJECTIVES
RESEARCH APPROACH
PROGRAM SUPPORT PROJECTS
PROGRAM COST
THE FACILITY FOR ACCELERATED SERVICE TESTS
CONCLUSIONS
Chapter 3: A BALANCED NATIONAL TRANSPORTATION BUDGET — A GROWING POSSIBILITY
Publisher Summary
INTERIM FINANCIAL AID
FEDERAL LOAN ASSISTANCE
GRANTS AND SUBSIDIES
GOVERNMENT TAKEOVER
LOANS AND GRANTS FOR RIGHT-OF-WAY IMPROVEMENT
TRUST FUNDS
PUBLIC SERVICE JOBS
TECHNICAL PAPERS
Chapter 4: RAILROAD TRACK STRUCTURE FOR HIGH-SPEED LINES
Publisher Summary
1 INTRODUCTION
2 BALLASTED TRACK
3 TRACK STRUCTURE ON A RIGID PAVEMENT
4 CALCULATION OF DIMENSIONS FOR A RIGID PAVEMENT
5 RESEARCH PROJECTS
6 RECOMMENDATION
7 CONCLUDING OBSERVATION
APPENDIX 1 ESTIMATE OF THE WHEEL LOAD AND WHEEL LOAD FLUCTUATIONS OF A TRAIN
APPENDIX 2 ANALYSIS OF BENDING STRESSES IN A THREE-LAYER SYSTEM
APPENDIX 3 ANALYSIS OF BENDING STRESSES IN A FOUR-LAYER SYSTEM
DISCUSSION
Chapter 5: CAUSE AND EFFECTS OF WHEEL LOAD VARIATION ON THE HIGH SPEED OPERATING LINE
Publisher Summary
1 INTRODUCTION
2 VERY LARGE WHEEL LOAD CAUSED ON THE TOKAIDO SHINKANSEN BY 951-TYPE TEST TRAIN [2]
3 WHEEL LOAD VARIATIONS OBSERVED IN THE SPEEDUP TEST BETWEEN SHIN-OSAKA AND OKAYAMA ON THE SAN-YO SHINKANSEN
4 COMPOSITION OF TRACK FOR A HIGH SPEED RAILWAY FROM THE VIEWPOINT OF THE SUPPRESSION OF WHEEL LOAD VARIATION
5 DEVELOPMENT OF IMPROVED TRACK STRUCTURE WITH BALLAST, USED IN THE NATIONWIDE SHINKANSEN NETWORK
6 CONCLUDING REMARKS
DISCUSSION
Chapter 6: FORCES AND BEHAVIOR OF RAILROAD TRACKS AT VERY HIGH TRAIN SPEEDS; STANDARDS ADOPTED BY SNCF FOR ITS FUTURE HIGH SPEED LINES (250 to 300 km/h)
Publisher Summary
1 INTRODUCTION
2 BOGIE STABILITY
3 INDUCED FORCES
4 QUALITY OF TRACK GEOMETRY
5 STANDARDS ADOPTED BY SNCF
CONCLUSIONS
DISCUSSION
Chapter 7: THE EFFECT OF LATERAL LOADS ON TRACK MOVEMENT
Publisher Summary
1 INTRODUCTION
2 THE RESISTANCE OF INDIVIDUAL SLEEPERS TO LATERAL FORCES
3 TRACK ANALYSES
4 DYNAMIC LOADS
5 LATERAL SHIFTING OF TRACK UNDER A MOVING LATERAL LOAD; EXPERIMENTAL EVIDENCE
6 CURRENT RESEARCH
7 DISCUSSION
ACKNOWLEDGEMENTS
DISCUSSION
Chapter 8: LATERAL BUCKLING OF RAILROAD TRACKS DUE TO CONSTRAINED THERMAL EXPANSIONS — A CRITICAL SURVEY
SUMMARY
1 INTRODUCTION
2 TRACK BUCKLING TESTS
3 TRACK BUCKLING ANALYSES
CONCLUSIONS
ACKNOWLEDGMENT
DISCUSSION
Chapter 9: THE EXPERIMENTAL DETERMINATION OF THE AXIAL AND LATERAL TRACK-BALLAST RESISTANCE
SUMMARY
1 INTRODUCTION AND STATEMENT OF PROBLEM
2 THE LATERAL RESISTANCE OF THE TRACK
3 AXIAL RESISTANCE OF THE TRACK
4 CONCLUSIONS
Chapter 10: RECENT INVESTIGATIONS OF THE DYNAMIC MODULUS OF ELASTICITY OF THE TRACK IN BALLAST WITH REGARD TO HIGH SPEEDS
Publisher Summary
1 GENERAL INTRODUCTION
2 VEHICLE - TRACK - MODEL
3 TESTS AND EXPERIMENTAL DETERMINATION OF THE DYNAMIC E-MODULUS OF THE TRACK AND OF THE DAMPING
4 EXPERIMENTS FOR THE DETERMINATION OF DYNAMIC STIFFNESS AND DAMPING ON RAILROAD TRACKS IN ENGLAND
5 CONCLUSIONS AND RECOMMENDATIONS
DISCUSSION
Chapter 11: THE CURRENT STATUS OF MEASUREMENTS AND EVALUATION TECHNIQUES FOR STRUCTURE-BORNE SOUND MEASURED AT THE TRACK
Publisher Summary
1 GENERAL
2 MEASUREMENT OF STRUCTURE-BORNE SOUND [1]
3 EVALUATION OF MEASUREMENTS OF STRUCTURE-BORNE SOUND
4 THE LIMITS OF FREQUENCY ANALYSIS [4]
DISCUSSION
Chapter 12: THE DEVELOPMENT OF ANALYTICAL MODELS FOR RAILROAD TRACK DYNAMICS
ABSTRACT
INTRODUCTION
DEVELOPMENT OF A MODEL
VALIDATION OF THE MODEL
CONCLUSIONS
ACKNOWLEDGEMENT
DISCUSSION
Chapter 13: DEVELOPMENT OF THE PRESTRESSED CONCRETE TIE IN THE USA
Publisher Summary
INTRODUCTION
EARLY TIE PROBLEMS AND SOLUTIONS
SPECIFICATIONS
PERFORMANCE OF INTERMEDIATE TIES
STRENGTHENING THE SPECIFICATIONS
SERVICE TESTS FOR NEW TIES
PERFORMANCE OF NEW TIES
FUTURE MODIFICATIONS OF SPECIFICATIONS
DISCUSSION
Chapter 14: THE MECHANICS OF RAIL FASTENERS FOR CONCRETE SLAB TRACK
SUMMARY
1 INTRODUCTION
2 VERTICAL ELASTICITY OF FASTENERS
3 TRANSVERSE ELASTICITY
4 OTHER MODES OF ELASTICITY
5 DAMPING
6 PRACTICAL ASPECTS
7 FUTURE TRENDS
Chapter 15: REQUIREMENTS FOR THE RELIABILITY ASSESSMENT OF RAILROAD RAIL IN SERVICE
ABSTRACT
BACKGROUND
WEB DEFECTS OUTS IDE OF JOINT BAR REGION ACCOUNT FOR 20% OF THE DERAILMENTS BUT ONLY 3% OF THE DETECTED POPULATION
RELIABILITY ANALYSIS
APPLICATION TO RAIL
SUMMARY
DISCUSSION
Chapter 16: A REVIEW OF RAIL—WHEEL CONTACT STRESS PROBLEMS
ABSTRACT
1 INTRODUCTION
2 THEORY OF CONTACT OF FRICTIONLESS COUNTERFORMAL, ELASTIC BODIES (HERTZIAN FORMULATION)
3 CONFORMAL CONTACT PROBLEMS
4 ROLLING CONTACT, ADHESION, AND CREEP
5 ADDITIONAL NON-HERTZIAN EFFECTS
6 PLASTIC DEFORMATIONS AND RESIDUAL STRESSES
7 CONCLUSIONS
ACKNOWLEDGMENT
DISCUSSION
Chapter 17: AN INTRODUCTION TO THE FRACTURE MECHANICS OF RAILROAD RAILS
ABSTRACT
INTRODUCTION
THE CRITICAL CONDITIONS FOR UNSTABLE, RAPID FRACTURE
MEASUREMENT OF KC AND APPLICATIONS
VARIABLES WHICH AFFECT FRACTURE TOUGHNESS
MATERIALS
DESCRIPTION OF TESTS
RESULTS
DISCUSSION
ACKNOWLEDGMENT
DISCUSSION
Chapter 18: SELECTION AND PERFORMANCE OF RAILROAD BALLAST
ABSTRACT
INTRODUCTION
PART 1 – SELECTION OF BALLAST BALLAST FIELD RATING
STANDARD LABORATORY CLASSIFICATION TESTS
CORRELATION OF FIELD RATING WITH CLASSIFICATION TESTS
BALLAST SPECIFICATION REQUIREMENTS
DISCUSSION OF ERRORS
PART 2 - PLACEMENT AND PERFORMANCE OF BALLAST
ONE DIMENSIONAL VIBRATION TEST
STANDARD TRIAXIAL TESTING OF COTEAU DOLOMITE
REPEATED LOADING TESTS ON COTEAU DOLOMITE
MODEL TESTS
CONCLUSIONS
ACKNOWLEDGEMENT
DISCUSSION
Chapter 19: A CONTRIBUTION TO BALLAST MECHANICS
SUMMARY
INTRODUCTION
BALLAST STABILITY
THE BALLAST BED UNDER LOAD
LATERAL TRACK RESISTANCE
THE WING-TIES BY SCHUBERT
Chapter 20: DEFORMATION OF RAILWAY BALLAST UNDER REPEATED LOADING CONDITIONS
SUMMARY
1 INTRODUCTION
2 BEHAVIOUR OF BALLAST IN THE TRACK
3 LABORATORY TESTS
4 TEST RESULTS - AXIAL STRAIN
5 PERMANENT LATERAL STRAIN
6 ELASTIC PROPERTIES
7 PROGRAMMED LOADING
8 CONCLUSIONS AND PRACTICAL IMPLICATIONS OF TEST RESULTS