ASTM_D_5977_-_15.pdf

Designation:D597715Standard Specification forHigh Load Rotational Spherical Bearings for Bridges andStructures1This standard is issued under the fixed designation D5977;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()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers bridge bearings that consist ofa spherical rotational element,where a stainless steel convexsurface slides against a concave carbon steel plate covered withwoven or sheet polytetrafluoroethylene(PTFE).The functionof the bearing is to transfer loads and to accommodate anyrelative movement,including rotation between a bridge super-structure and its supporting structure,or both.1.2 This specification covers the requirements of sphericalbearings with a standard horizontal load(a maximum of 10%of vertical).1.3 The requirements stated in this specification are theminima necessary for the manufacture of quality bearingdevices.It may be necessary to increase these minimum valuesdue to other design conditions.1.4 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are forinformation 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:2A36/A36M Specification for Carbon Structural SteelA167 Specification for Stainless and Heat-ResistingChromium-Nickel Steel Plate,Sheet,and Strip(With-drawn 2014)3A240/A240M Specification for Chromium and Chromium-Nickel Stainless Steel Plate,Sheet,and Strip for PressureVessels and for General ApplicationsA572/A572M Specification for High-Strength Low-AlloyColumbium-Vanadium Structural SteelA588/A588M Specification for High-Strength Low-AlloyStructural Steel,up to 50 ksi 345 MPa Minimum YieldPoint,with Atmospheric Corrosion ResistanceA709/A709M Specification for Structural Steel for BridgesD638 Test Method for Tensile Properties of PlasticsD792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD1457 Specification for Polytetrafluoroethylene(PTFE)Molding and Extrusion Materials(Withdrawn 1996)3D1777 Test Method for Thickness of Textile MaterialsD2256 Test Method for Tensile Properties of Yarns by theSingle-Strand Method2.2 AASHTO Standard:4AASHTO Standard Specifications for Highway Bridges2.3 AWS Standards:5C.2.2-67 Metalizing with Aluminum and Zinc for Protectionof Iron and SteelD.1.5 ANSI/AASHTO/AWS Bridge Welding Code3.Classification3.1 The bearings are furnished in three types,as follows:3.1.1 Fixed Spherical BearingRotation only.3.1.2 Uni-Directional Sliding Spherical BearingRotationplus movement in one direction.3.1.3 Multi-DirectionalSlidingSphericalBearingRotation plus movement in all directions.1This specification is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.32 onBridges and Structures.Current edition approved June 1,2015.Published July 2015.Originally approvedin 1996.Last previous edition approved in 2012 as D5977 03(2012).DOI:10.1520/D5977-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American Association of State Highway and TransportationOfficials(AASHTO),444 N.Capitol St.,NW,Suite 249,Washington,DC 20001,http:/www.transportation.org.5Available from American Welding Society(AWS),550 NW LeJeune Rd.,Miami,FL 33126,http:/www.aws.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Material Specifications4.1 SteelThe steel used for all major plates shall bestructural steel conforming to Specifications A36/A36M,A588/A588M,A572/A572M,or A709/A709M,as required.All exposed surfaces shall be zinc metalized according toAWSC.2.2-67(with no chipping),having a minimum thickness of 6mil(0.152 mm)or treated with other project-approved coatingsystems such as coal tar or inorganic zinc paint.The dry filmthickness(DFT)of the approved paint system must be speci-fied by the owner.4.2 Stainless Steel:4.2.1 Flat Sliding SurfaceThe sheet stainless steel used asthe mating sliding surface to the woven fabric PTFE or sheetPTFE in the sliding spherical bearings shall conform toSpecification A167 or A240/A240M,type 30