ASTM D5977-03(2007)
(Specification)Standard Specification for High Load Rotational Spherical Bearings for Bridges and Structures
Standard Specification for High Load Rotational Spherical Bearings for Bridges and Structures
ABSTRACT
This specification covers bridge bearings that consist of a spherical rotational element, where a stainless steel convex surface slides against a concave carbon steel plate covered with woven or sheet polytetrafluoroethylene (PTFE). The function of the bearing is to transfer loads and to accommodate any relative movement, including rotation between a bridge superstructure and its supporting structure, or both. The requirements of spherical bearings with a standard horizontal load (a maximum of 10 % of vertical) are discussed. The bearings are furnished in three types: fixed spherical bearing which is for rotation only, unidirectional sliding spherical bearing which is for rotation plus movement in one direction, and multi-directional sliding spherical bearing which is for rotation plus movement in all directions. The materials to be used in producing the bearings include: steel, stainless steel (flat sliding surface and convex surface), woven fabric polytetrafluoroethylene, and sheet polytetrafluoroethylene. The following different test methods shall be performed: proof load and rotation tests for fixed and expansion bearings, coefficient of friction test for expansion bearings only, PTFE (woven or sheet) bond test for expansion bearings only, and physical property test of both PTFEs for fixed and expansion bearings.
SCOPE
1.1 This specification covers bridge bearings that consist of a spherical rotational element, where a stainless steel convex surface slides against a concave carbon steel plate covered with woven or sheet polytetrafluoroethylene (PTFE). The function of the bearing is to transfer loads and to accommodate any relative movement, including rotation between a bridge superstructure and its supporting structure, or both.
1.2 This specification covers the requirements of spherical bearings with a standard horizontal load (a maximum of 10 % of vertical).
1.3 The requirements stated in this specification are the minima necessary for the manufacture of quality bearing devices. It may be necessary to increase these minimum values due to other design conditions.
1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.5 The following safety hazards caveat pertains only to the test method portion, Section 7, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:D5977 −03(Reapproved 2007)
Standard Specification for
High Load Rotational Spherical Bearings for Bridges and
1
Structures
This standard is issued under the fixed designation D5977; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope A240/A240MSpecification for Chromium and Chromium-
Nickel Stainless Steel Plate, Sheet, and Strip for Pressure
1.1 This specification covers bridge bearings that consist of
Vessels and for General Applications
a spherical rotational element, where a stainless steel convex
A572/A572MSpecification for High-Strength Low-Alloy
surfaceslidesagainstaconcavecarbonsteelplatecoveredwith
Columbium-Vanadium Structural Steel
woven or sheet polytetrafluoroethylene (PTFE). The function
A588/A588MSpecification for High-Strength Low-Alloy
of the bearing is to transfer loads and to accommodate any
Structural Steel, up to 50 ksi [345 MPa] Minimum Yield
relative movement, including rotation between a bridge super-
Point, with Atmospheric Corrosion Resistance
structure and its supporting structure, or both.
A709/A709MSpecification for Structural Steel for Bridges
1.2 This specification covers the requirements of spherical
D638Test Method for Tensile Properties of Plastics
bearings with a standard horizontal load (a maximum of 10%
D792Test Methods for Density and Specific Gravity (Rela-
of vertical).
tive Density) of Plastics by Displacement
1.3 The requirements stated in this specification are the D1457 Specification for Polytetrafluoroethylene (Ptfe)
3
Molding and Extrusion Materials (Withdrawn 1996)
minima necessary for the manufacture of quality bearing
devices.Itmaybenecessarytoincreasetheseminimumvalues D1777Test Method for Thickness of Textile Materials
D2256Test Method for Tensile Properties of Yarns by the
due to other design conditions.
Single-Strand Method
1.4 The values stated in inch-pound units are to be regarded
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2.2 AASHTO Standard:
as the standard. The values given in parentheses are for
AASHTO Standard Specifications for Highway Bridges
information only.
5
2.3 AWS Standards:
1.5 The following safety hazards caveat pertains only to the
C.2.2-67Metalizing withAluminum and Zinc for Protection
test method portion, Section 7, of this specification: This
of Iron and Steel
standard does not purport to address all of the safety concerns,
D.1.5ANSI/AASHTO/AWS Bridge Welding Code
if any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety and health
3. Classification
practices and determine the applicability of regulatory limita-
3.1 The bearings are furnished in three types, as follows:
tions prior to use.
3.1.1 Fixed Spherical Bearing—Rotation only.
3.1.2 Uni-Directional Sliding Spherical Bearing—Rotation
2. Referenced Documents
plus movement in one direction.
2
2.1 ASTM Standards:
3.1.3 Multi-Directional Sliding Spherical Bearing—
A36/A36MSpecification for Carbon Structural Steel
Rotation plus movement in all directions.
A167 Specification for Stainless and Heat-Resisting
Chromium-Nickel Steel Plate, Sheet, and Strip
4. Material Specifications
4.1 Steel—The steel used for all major plates shall be
structural steel conforming to Specifications A36/A36M,
1
This specification is under the jurisdiction ofASTM Committee D04 on Road
and Paving Materials and is the direct responsibility of Subcommittee D04.32 on
Bridges and Structures.
3
Current edition approved Dec. 1, 2007. Published January 2008. Originally The last approved version of this historical standard is referenced on
approved in 1996. Last previous edition approved in 2003 as D5977–03. DOI: www.astm.org.
4
10.1520/D5977-03R07. Available from American Association of State Highway and Transportation
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM http://www.transportation.org.
5
Standards volume information, refer to the standard’s Document Summary page on Available from American Welding Society (AWS), 550 NW LeJeune Rd.,
the ASTM website. Miami, FL 33126, http://www.aws.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D5977−03 (2007)
A588/A588M, A572/A572M,or A709/A709M, as required. 4.4.1 The thickness of the sheet PTFE shall be a minimum
1
AllexposedsurfacesshallbezincmetalizedaccordingtoAWS of ⁄8in.(3.17mm)andshallberecessedatleastone-halfofits
C.2.2-67 (with no c
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D5977–96 Designation: D 5977 – 03 (Reapproved 2007)
Standard Specification for
High Load Rotational Spherical Bearings for Bridges and
1
Structures
This standard is issued under the fixed designation D5977; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 Thisspecificationcoversbridgebearingsthatconsistofasphericalrotationalelement,whereastainlesssteelconvexsurface
slides against a concave carbon steel plate covered with woven or sheet polytetrafluoroethylene (PTFE). The function of the
bearing is to transfer loads and to accommodate any relative movement, including rotation between a bridge superstructure and
its supporting structure, or both.
1.2 This specification covers the requirements of spherical bearings with a standard horizontal load (a maximum of 10% of
vertical).
1.3 Therequirementsstatedinthisspecificationaretheminimanecessaryforthemanufactureofqualitybearingdevices.Itmay
be necessary to increase these minimum values due to other design conditions.
1.4 Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformation
only.
1.5 The following safety hazards caveat pertains only to the test method portion, Section 7, of this specification: This standard
does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this
standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
A36/A36M Specification for Carbon Structural Steel
A167 Specification for Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip
A240/A240M Specification for Heat-Resisting Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for
Pressure Vessels and for General Applications
A572/A572M Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel
A588/A588MSpecification for High-Strength Low-Alloy Structural Steel with 50 ksi [345 MPa] MinimumYield Point to 4 in.
2
[100mm]Thick 588/A588M SpecificationforHigh-StrengthLow-AlloyStructuralSteel,upto50ksi[345MPa]Minimum
Yield Point, with Atmospheric Corrosion Resistance
A709/A 709MSpecification for Carbon and High-Strength Low-Alloy Structural Steel Shapes, Plates, and Bars and
2
Quenched-and-Tempered Alloy Structural Steel Plates for Bridges 709/A709M Specification for Structural Steel for
Bridges
D638 Test Method for Tensile Properties of Plastics
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D1457 Specification for Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials
D1777 Test Method for Measuring Thickness of Textile Materials
D2256 Test Method for Tensile Properties of Yarns by the Single-Strand Method
3
2.2 AASHTO Standard:
1
This specification is under the jurisdiction ofASTM Committee D-4 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.32 on Bridges
and Structures.
Current edition approved July 10, 1996. Published September 1996.
1
This specification is under the jurisdiction ofASTM Committee D04 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.32 on Bridges
and Structures.
Current edition approved Dec. 1, 2007. Published January 2008. Originally approved in 1996. Last previous edition approved in 2003 as D5977–03.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book of ASTM Standards
, Vol 01.04.volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Annual Book of ASTM Standards, Vol 01.03.
3
Available from American Association of State Highway and Transportation Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,
http://www.transportation.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D 5977 – 03 (2007)
AASHTO Standard Specifications for Highway Bridges
4
2.3 AWS Standards:
C.2.2-67 Metalizing with Aluminum and Zinc for Protection of Iron and Steel
D.1.5 ANSI/AASHTO/AWS Bridge Welding Code
3. Classification
3.1 The bearings ar
...
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