ASTM D5977-15

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.

General Information

• Status: Historical
• Publication Date: 31-May-2015
• ICS: 93.040 - Bridge construction
• Technical Committee: D04 - Road and Paving Materials
• Drafting Committee: D04.32 - Bridges and Structures

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D5977 − 15
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. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Chromium-Nickel Steel Plate, Sheet, and Strip (With-
3
drawn 2014)
1.1 This specification covers bridge bearings that consist of
A240/A240M Specification for Chromium and Chromium-
a spherical rotational element, where a stainless steel convex
Nickel Stainless Steel Plate, Sheet, and Strip for Pressure
surface slides against a concave carbon steel plate covered with
Vessels and for General Applications
woven or sheet polytetrafluoroethylene (PTFE). The function
A572/A572M Specification for High-Strength Low-Alloy
of the bearing is to transfer loads and to accommodate any
Columbium-Vanadium Structural Steel
relative movement, including rotation between a bridge super-
A588/A588M Specification for High-Strength Low-Alloy
structure and its supporting structure, or both.
Structural Steel, up to 50 ksi [345 MPa] Minimum Yield
1.2 This specification covers the requirements of spherical
Point, with Atmospheric Corrosion Resistance
bearings with a standard horizontal load (a maximum of 10 %
A709/A709M Specification for Structural Steel for Bridges
of vertical).
D638 Test Method for Tensile Properties of Plastics
D792 Test Methods for Density and Specific Gravity (Rela-
1.3 The requirements stated in this specification are the
tive Density) of Plastics by Displacement
minima necessary for the manufacture of quality bearing
D1457 Specification for Polytetrafluoroethylene (PTFE)
devices. It may be necessary to increase these minimum values
3
Molding and Extrusion Materials (Withdrawn 1996)
due to other design conditions.
D1777 Test Method for Thickness of Textile Materials
1.4 The values stated in inch-pound units are to be regarded
D2256 Test Method for Tensile Properties of Yarns by the
as the standard. The values given in parentheses are for
Single-Strand Method
information only.
4
2.2 AASHTO Standard:
1.5 The following safety hazards caveat pertains only to the
AASHTO Standard Specifications for Highway Bridges
test method portion, Section 7, of this specification: This
5
2.3 AWS Standards:
standard does not purport to address all of the safety concerns,
C.2.2-67 Metalizing with Aluminum and Zinc for Protection
if any, associated with its use. It is the responsibility of the user
of Iron and Steel
of this standard to establish appropriate safety and health
D.1.5 ANSI/AASHTO/AWS Bridge Welding Code
practices and determine the applicability of regulatory limita-
tions prior to use.
3. Classification
2. Referenced Documents
3.1 The bearings are furnished in three types, as follows:
2
2.1 ASTM Standards: 3.1.1 Fixed Spherical Bearing—Rotation only.
A36/A36M Specification for Carbon Structural Steel
3.1.2 Uni-Directional Sliding Spherical Bearing—Rotation
A167 Specification for Stainless and Heat-Resisting
plus movement in one direction.
3.1.3 Multi-Directional Sliding Spherical Bearing—
Rotation plus movement in all directions.
1
This specification is under the jurisdiction of ASTM Committee D04 on Road
and Paving Materials and is the direct responsibility of Subcommittee D04.32 on
Bridges and Structures.
3
Current edition approved June 1, 2015. Published July 2015. Originally approved The last approved version of this historical standard is referenced on
in 1996. Last previous edition approved in 2012 as D5977 – 03 (2012). DOI: www.astm.org.
4
10.1520/D5977-15. 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 [e-mail]. 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
1

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D5977 − 15
4. Material Specifications guide bars only, filler material shall be composed of milled
glass fibers or carbon.
4.1 Steel—The steel used for all major plates shall be
4.4.1 The thickness of the sheet PTFE shall be a minimum
structural steel conforming to Specifications A36/A36M,
1
of ⁄8 in. (3.17 mm) and shall be
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM 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 − 03 (Reapproved 2012) D5977 − 15
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. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. 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.
2. Referenced Documents
2
2.1 ASTM Standards:
A36/A36M Specification for Carbon Structural Steel
3
A167 Specification for Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip (Withdrawn 2014)
A240/A240M Specification for 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/A588M Specification for High-Strength Low-Alloy Structural Steel, up to 50 ksi [345 MPa] Minimum Yield Point, with
Atmospheric Corrosion Resistance
A709/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
3
D1457 Specification for Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials (Withdrawn 1996)
D1777 Test Method for Thickness of Textile Materials
D2256 Test Method for Tensile Properties of Yarns by the Single-Strand Method
4
2.2 AASHTO Standard:
AASHTO Standard Specifications for Highway Bridges
1
This specification is under the jurisdiction of ASTM Committee D04 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.32 on Bridges
and Structures.
Current edition approved July 15, 2012June 1, 2015. Published July 2012July 2015. Originally approved in 1996. Last previous edition approved in 20072012 as
D5977 – 03 (2012).(2007). DOI: 10.1520/D5977-03R12. 10.1520/D5977-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
4
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 ----------------------
D5977 − 15
5
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 are furnished in three types, as follows:
3.1.1 Fixed Spherical Bearing—Rotation only.
3.1.2 Uni-Directional Sliding Spherical Bearing—Rotation plus movement in one direction.
3.1.3 Multi-Directional Sliding Spherical Bearing—Rotation plus movement in all directions.
4. Material Specifications
4.1 Steel—The steel used for all major plates shall be structu
...