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IS 2090:2018 is the Indian Standard (BIS) for design of bearings for bridges - code of practice. Provides comprehensive guidelines and specifications for the design, material selection, testing, and installation of various bridge bearings (including elastomeric, POT, and PTFE sliding types) to ensure proper structural load transfer and accommodation of thermal and seismic movements.
Specifies requirements for the design and selection of various types of bearings used in bridges, providing general guidance where specific bearing standards do not apply.
Overview
Status
Current
Usage level
Specialized
Domain
Structural Engineering — Bridges and Bridge Engineering
EN 1337 SeriesCEN (European Committee for Standardization), Europe
HighCurrent
Structural bearings (multiple parts, e.g., Part 1: General design rules, Part 3: Elastomeric bearings, Part 5: Pot bearings)
Covers the same range of bearing types (elastomeric, pot, metallic) with a similar design philosophy.
AASHTO LRFD Bridge Design Specifications, 9th EditionAASHTO (American Association of State Highway and Transportation Officials), USA
HighCurrent
AASHTO LRFD Bridge Design Specifications (Section 14: Joints and Bearings)
Section 14 provides comprehensive design rules for elastomeric, pot, spherical, and other bearing types.
AS 5100.4:2017Standards Australia, Australia
HighCurrent
Bridge design - Part 4: Bearings and deck joints
Specifies design requirements for bridge bearings and joints, covering a similar scope to IS 2090.
BS 5400-9:1983BSI (British Standards Institution), UK
MediumWithdrawn
Steel, concrete and composite bridges. Bridge bearings. Code of practice for design of bridge bearings.
Served as the basis for UK bridge bearing design before Eurocodes, sharing many fundamental principles with IS 2090.
Key Differences
≠IS 2090 specifies a single shear modulus range (e.g., 0.8-1.2 MPa) for common elastomers, whereas EN 1337-3 defines five distinct classes based on shear modulus (G), allowing for more specific material selection.
≠Testing protocols differ; IS 2090 often mandates more stringent or 100% testing for certain bearing types, while EN 1337 and AASHTO may allow for statistically-based batch testing, which can be less onerous for large production runs.
≠IS 2090 limits the average pressure on the elastomeric pad in a pot bearing to 40 MPa. EN 1337-5 allows for slightly different calculations and can permit higher stresses if additional design verifications are met.
≠The minimum thickness for steel laminates in elastomeric bearings is 3 mm in IS 2090, which is thicker than the 1.5 mm (1/16 inch) specified in AASHTO LRFD, impacting bearing dimensions and manufacturing.
Key Similarities
≈All standards cover a similar portfolio of modern bearing types, including laminated elastomeric, pot, and PTFE sliding bearings, reflecting common international practice.
≈The fundamental design verification methodology is consistent, involving checks for stresses, strains, and stability at both Serviceability Limit State (SLS) and Ultimate Limit State (ULS).
≈The use and design principles for PTFE as a low-friction sliding surface are broadly harmonized, including requirements for mating surfaces (e.g., polished stainless steel) and lubrication.
≈For elastomeric bearings, all codes use the 'Shape Factor' (S) as a key parameter to control compressive stress, strain, and bulging, demonstrating a shared theoretical basis.