ASTM D5977 - 03(2012)

    Standard Specification for High Load Rotational Spherical Bearings for Bridges and Structures

    Active Standard ASTM D5977 | Developed by Subcommittee: D04.32

    Book of Standards Volume: 04.03


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    ASTM D5977

    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.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    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 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

    D1457 Specification for Polytetrafluoroethylene (Ptfe) Molding and Extrusion Materials

    D1777 Test Method for Thickness of Textile Materials

    D2256 Test Method for Tensile Properties of Yarns by the Single-Strand Method

    AASHTO Standard

    AASHTOStandardSpecif

    AWS Standards

    D.1.5 ANSI/AASHTO/AWS Bridge Welding Code


    ICS Code

    ICS Number Code 93.040 (Bridge construction)

    UNSPSC Code

    UNSPSC Code 31171510(Spherical bearings)


    DOI: 10.1520/D5977-03R12

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