Movable Bridge Design

ISBN-13: 9780727758040 / Angielski / Twarda / 2015 / 432 str.

Charles Birnstiel; George Foerster; William Bowden

Opis

This is a comprehensive guide which focuses on the design of the most commonly found movable bridge varieties, and also provides information on the mechanical systems which generate the movement an area with which most bridge design engineers are less familiar, but require knowledge of in order to design effective structures of this type. Movable Bridge Design is a unique reference on past and current structural, mechanical, electrical, and hydraulic design for engineers in, or about to enter, this interdisciplinary field. It offers comprehensive coverage of all of the most common movable bridge types, provides key information on the mechanical systems which drive the bridges and how this impacts on design considerations."

Spis treści

Contents CHAPTER 1 INTRODUCTION Introduction – need for movable bridges Basic motions of movable spans Early movable bridges Important movable bridges built since 1850 CHAPTER 2 TYPES OF MOVABLE BRIDGES AND SIGNIFICANT FEATURES Trunnion bascule bridges Rolling bascule bridges Swing bridges Vertical lift bridges Retractile bridges Transporter bridges Folding bridges Other types of movable bridges CHAPTER 3 SUPERSTRUCTURE FORMS Bascule bridges Swing bridges Vertical lift bridges Retractile bridges Other bridge types Interaction between superstructure and machinery Balanced versus unbalanced, or partially balanced, movable spans CHAPTER 4 SPAN DRIVE MACHINERY ARRANGEMENTS Electro-mechanical span drives Hydraulic span drives Other types of main span drives Manual emergency drives Other emergency drives CHAPTER 5 STABILIZING MACHINERY Bascule bridges Swing bridges Vertical lift bridges Retractile bridges CHAPTER 6 MECHANICAL COMPONENTS AND DETAILS Materials and treatments to alter their physical properties ASTM Specifications Components and equipment; gearing, speed reducers, shafts, couplings, plain and anti-friction bearings, power screws, unit operators, brakes and thrusters, clutches, wire ropes, drums and sheaves, shims, wedges, and fasteners. CHAPTER 7 HYDRAULIC MACHINERY AND DETAILS Historical background (including Armstrong machinery) Closed loop versus open loop systems Cylinders and end fittings Radial piston motors Hydraulic brakes Power packs CHAPTER 8 ELECTRICAL EQUIPMENT Prime movers Electrical control drives; AC wound rotor motors with stepped external resistance, Ward-Leonard System, AC Reversing Thyristor System, DC Solid State(SCR) System, Adjustable Frequency Drives, and Flux Vector Drives Electro-hydraulic mechanical brakes Hard-wired relays. Programmable logic controllers Control Desk Limit switches Submarine cables and terminal boxes Auxiliary power and transfer switches Navigation lights CHAPTER 9 DESIGN SPECIFICATIONS Historical development of design specifications for movable bridges Comparison of current design specifications and codes for some significant subjects (USA, Canada, Netherlands, Germany). CHAPTER 10 STRUCTURAL DESIGN Gravity and wind loading, temperature and support movement effects, fatigue, span balance, and inertia Seismic analysis/design Movable span balance criteria. Design example: trunnion bascule girder CHAPTER 11 MECHANICAL DESIGN Loadings and load factors Bending and torsion analyses of shafting in mechanical gear trains Linkage analysis Stress analysis of gears Selection of gears based on AGMA and ISO standards. Selection of speed reducers Selection and design of lock-bar operators Brake selection Design of shafts including fatigue and fracture mechanics considerations Vibration of shafts Design of sleeve and antifriction bearings Selection of shaft couplings Interference fits, keys, and friction hubs Contact stresses and design of rollers and wheels Selection of wire rope, drums, and sheaves Friction and lubrication Single-mode failure analysis Design examples: gear-set, speed reducer, lock-bar operator, trunnion shaft, gear train shaft, sleeve bearing, antifriction bearing, and coupling. CHAPTER 12 HYDRAULIC MACHINERY DESIGN Closed loop and open loop systems Selection of components; cylinders, pumps, radial piston motors, reciprocating motors, accumulators, piping and fittings, valves, and power packs Hydraulic system simulation software Hydraulic fluids Design example: trunnion bascule using cylinders CHAPTER 13 ELECTRICAL SYSTEM DESIGN Requirements of design codes related to electrical power and speed control Selection of prime mover Design of wound rotor-external resistance speed control system Selection of flux vector drive Interlocking with auxiliary equipment Relay versus programmable logic (PLC)- based control systems. Design example: AC wound rotor motor with external resistance. CHAPTER 14 FUTURE TRENDS Architectural Structural Mechanical and hydraulic machinery Prime movers and electrical controls NOTATION GLOSSARY BIBLIOGRAPHY