Experimental investigation of skewed elastomeric expansion bridge bearings (FHWA-OK-87-3)

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dc.contributor.sponsorOklahoma Department of Transportation. Materials and Research Division. Office of Research & Implementation
dc.creatorAllen, Gregory D.
dc.creatorMurray, Thomas M.
dc.date.accessioned2018-11-06T16:47:00Z
dc.date.available2018-11-06T16:47:00Z
dc.date.issued1987-4
dc.description.abstractTwelve skewed elastomeric expansion bridge bearings were supplied by the Oklahoma Department of Transportation. To evaluate the performance of these skewed bearings, the following six phases of testing were conducted on each of the twelve bearings: I. Shear and compressive stiffness tests, II. Fatigue cycles representing 50 years of service with parallel bearing surfaces, III. Shear and compressive stiffness tests, IV. Shear stiffness tests with bearings at sub-freezing temperatures, V. Fatigue cycles representing 50 years of service with rotated bearing surfaces, and VI. Shear stiffness tests Phase I formed the basis of comparison with the post-fatigue results from Phases III and VI, and the low temperature tests from Phase IV. It was found that the fatigue loading with parallel bearing surfaces had very little effect on the compressive and shear stiffnesses of the skewed bearings. Some degradation of shear stiffness was found after the fatigue loading with rotated bearing surfaces, Phase V. However, the combined degradation due to both fatigue loadings was considered insignificant. It was found that the simple shear equation for estimating the shear stiffnesses of the twelve bearings was very conservative and no correlation was evident between predictions and the experimental results of Phase I. In general, the shear stiffness changed more rapidly than the change in bearing area as the skew angle decreased from 900 (rectangular) to:300. As an outgrowth of the experimental work, design expressions for determining the effective shear stiffnesses of both skewed and rectangular bearings with turned axes were developed. Excellent correlation was found between shear stiffness predictions from the proposed equations and the experimental results.
dc.description.peerreviewNo
dc.description.versionExecutive Summary January 1985-April 1987
dc.format.extent30 pages
dc.format.extent856,011 bytes
dc.format.mediumapplication.pdf
dc.identifier.govdocFHWA-OK-87-3
dc.identifier.otherOklahoma Department of Transportation State Planning and Research
dc.identifier.urihttps://hdl.handle.net/11244/301998
dc.languageen_US
dc.relation.ispartofseriesNo
dc.relation.requiresAdobe Acrobat Reader
dc.subject.keywordsSkew
dc.subject.keywordsBearings
dc.subject.keywordsElastomeric
dc.subject.keywordsBridges
dc.subject.keywordsShear stiffness
dc.subject.keywordsExpansion device
dc.subject.keywordsShear modulus
dc.titleExperimental investigation of skewed elastomeric expansion bridge bearings (FHWA-OK-87-3)
dc.typeTechnical Report
dc.type.materialtext

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