Cooperating organizations
Foreword
1 Scope
2 References
3 Definitions and symbols
3.1 Definitions
3.2 Symbols
4 Function of bearings
5 Design considerations
5.1 General
5.2 Limit state requirements
5.2.1 Serviceability limit state
5.2.2 Ultimate limit state
5.3 Design life
5.4 Provision for resetting and replacement
5.5 Provision for handling
5.6 Access
5.7 Durability
5.8 Movement restraint
5.9 Uplift
5.10 Outer bearing plates or spreader plates
5.11 Use of different types of bearings
5.12 Positioning of bearings
5.13 Effects of variations within tolerances
5.14 Loads and load effects
5.14.1 General
5.14.2 Loading resulting from resistance to movement
5.14.3 Restraints against translation
5.15 Movements
5.15.1 General
5.15.2 Effects on other parts of the structure
5.15.3 Movement indicators
5.16 Materials
5.17 Bearing schedule
6 Particular recommendations for roller and rocker
bearings
6.1 General
6.1.1 Function
6.1.2 Curved surfaces
6.1.3 Surfaces in contact
6.1.4 Length of rollers
6.1.5 Guidance of rollers
6.1.6 Prevention of sliding
6.2 Allowable loads on steel and cast iron roller and
rocker bearings
6.2.1 Design limit state
6.2.2 Cylinder on curved surface
6.2.3 Cylinder on flat surface
6.2.4 Sphere in spherical seating
6.2.5 Sphere on flat surface
6.3 Flat-sided rollers
6.4 Non-cylindrical rollers
6.5 Multiple rollers
7 Particular recommendations for knuckle and leaf
bearings
7.1 General
7.1.1 Function
7.1.2 Curved surfaces
7.1.3 Mating surfaces
7.1.4 Separation of parts
7.2 Pins
7.3 Allowable bearing pressures for knuckle and leaf
bearings
7.3.1 Design limit state
7.3.2 Bearing pressures
8 Particular recommendations for plane sliding bearings
8.1 Function
8.2 Sliding surfaces
8.3 Arrangement of sliding surfaces
8.4 Prevention of rotation
9 Particular recommendations for sliding elements with
PTFE
9.1 Surfaces mating with PTFE
9.2 Location of PTFE
9.2.1 General
9.2.2 Confined PTFE
9.2.3 Bonded PTFE
9.3 Allowable sliding bearing pressures for pure PTFE
9.3.1 Design limit state
9.3.2 Maximum sliding contact pressures
9.3.3 Contact area
9.4 Thickness of stainless steel sliding surfaces
9.5 Fixing of stainless steel sheet
9.5.1 General
9.5.2 Attachment by welding
9.5.3 Attachment by fasteners
10 Particular recommendations for elastomeric bearings
10.1 General
10.1.1 Function
10.1.2 Basis of design
10.1.3 Design recommendations
10.1.4 Design limit state
10.2 Shear strain
10.3 Shape factor
10.3.1 General
10.3.2 Plain pad bearings
10.3.3 Strip bearings
10.3.4 Laminated bearings
10.4 Moduli of elastomer
10.5 Design pressure on plain pad and strip bearings
10.6 Maximum design strain in laminated bearings
10.7 Reinforcing plate thickness
10.8 Stability
10.8.1 Plain pad and strip bearings
10.8.2 Laminated bearings
10.9 Vertical deflection
10.9.1 General
10.9.2 Plainpad bearings
10.9.3 Strip bearings
10.9.4 Laminated bearings
10.10 Rotational limitation
10.10.1 Plain pad and laminated bearings
10.10.2 Strip bearings
10.11 Fixing of bearings
11 Particular recommendations for pot bearings
11.1 Function
11.2 Design
11.3 Rotation
11.4 Seal
12 Particular recommendations for guides
12.1 Function
12.2 Sliding surfaces for guides
12.2.1 PTFE facing
12.2.2 Unfaced surfaces
12.3 Allowable bearing pressures on guides
12.3.1 PTFE
12.3.2 Bronze
Appendix A Typical bridge bearing schedule
Publications referred to