ASTM_D_5212_-_03.pdf

Designation:D 5212 03Standard Specification forHigh Load Rotational Confined Elastomeric Bearings forBridges and Structures1This standard is issued under the fixed designation D 5212;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers bridge bearings which consistof a confined elastomeric element encased in steel(potbearings)when the function of the bearing is to transfer loadsor accommodate relative movement including rotation betweena bridge superstructure and its supporting structure,or both.1.2 This specification covers the requirements of pot bear-ings with standard horizontal loads(10%of vertical).1.3 The requirements stated in this specification are theminimums necessary for the manufacture of quality bearingdevices.It may be necessary to increase these minimum valuesdue to design conditions.1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are for informa-tion only.1.5 The following safety hazards caveat pertains only to thetest method portion,Section 7,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2.Referenced Documents2.1 ASTM Standards:A 36/A 36M Specification for Carbon Structural Steel2A 240/A 240M SpecificationforChromiumandChromium-Nickel Stainless Steel Plate,Sheet,and Stripfor Pressure Vessels and General Applications3A 572/A 572M Specification for High-Strength Low-AlloyColumbium-Vanadium Structural Steel2A 588/A 588M Specification for High-Strength Low-AlloyStructural Steel with 50 ksi(345 MPa)Minimum YieldPoint to 4 in.(100 mm)Thick2A 709/A 709M Specification for Carbon and High-StrengthLow-Alloy Structural Steel Shapes,Plates and Bars andQuenched and Tempered Alloy Structural Steel Plates forBridges2B 36/B 36M Specification for Brass Plate,Sheet,Strip,andRolled Bar4D 395 Test Methods for Rubber PropertyCompressionSet5D 412 Test Methods for Vulcanized Rubber and Thermo-plastic ElastomersTension5D 518 Test Method for Rubber DeteriorationSurfaceCracking5D 573 Test Method for RubberDeterioration in an AirOven5D 638 Test Method for Tensile Properties of Plastics6D 746 Test Method for Brittleness Temperature of Plasticsand Elastomers by Impact6D 792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by Displacement6D 1149 Test Method for Rubber DeteriorationSurfaceOzone Cracking in a Chamber5D 4895 Specification for Polytetrafluoroethylene(PTFE)Resin Produced From Dispersion7D 2240 Test for Rubber PropertyDurometer Hardness52.2AWS Standards:8C.2.267 Metalizing with Aluminum and Zinc for Protec-tion of Iron and SteelD.1.5 Bridge Welding CodeAASHTO/AWS WeldingStainless2.3Military Standard:9MIL-S-86603.Classification3.1 The bearings are furnished in three types as follows:3.1.1 Fixed Pot BearingRotation only.3.1.2 Uni-Directional Sliding Pot BearingRotation plusmovement in one direction.1This specification is under the jurisdiction of ASTM Committee D0-on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.32 onBridges and Structues.Current edition approved Feb.10,2003.Published May 2003.Originallyapproved in 1991.Last previous edition approved in 1997 as D 5212-91(1997).2Annual Book of ASTM Standards,Vol 01.04.3Annual Book of ASTM Standards,Vol 01.03.4Annual Book of ASTM Standards,Vol 02.01.5Annual Book of ASTM Standards,Vol 09.01.6Annual Book of ASTM Standards,Vol 08.01.7Annual Book of ASTM Standards,Vol 08.03.8Available from The American Welding Society(AWS),550 NW LeJeune Rd.,Miami,FL 33126.9Available from Standardization Documents Order Desk,DODSSP,Bldg.4,Section D,700 Robbins Ave.,Philadelphia,PA 19111-50981Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.3.1.3 Multi-Directional Sliding Pot BearingRotation plusmovement in all directions.3.2 The elastomer for the manufacture of the confinedelastometric element is furnished in one of two materials asfollows:3.2.1 Type CRPolychloroprene(neoprene)rubber.3.2.2 Type NRPolyisoprene(natural)rubber.4.Material Specifications4.1 SteelSteel used for the confining base plates or pot,piston,and top or sole plates shall conform to SpecificationsA 36/A 36M,A 588/A 588M,A 572/A 572M or A 709/A 709M as required.All exposed surfaces shall be zincmetallized according to AWS C.2.2(with no chipping)havinga minimum thickness of 6 mil(0.152 mm),or treated withother approved coating systems such as coal tar epoxy ororganic zinc.Internal surfaces shall not be coated.4.2 Stainless St