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A 200o-CliARACTER OR LESS FACTUAL SUMMARY OF MOST SIGNIFICANT INFORMATION. IF DOCUMENT INCLUDES A SIGNIFICANT BIBUOGRAPHY OR UTERATURE SURVEY, CITE IT HERE. SPELL OUT ACRONYMS ON FIRST REFERENCE.) (CONTINUE ON SEPARATE PAGE. IF NECESSARY.) NISTIR 5800, "Guidelines for Pre-Qualification, Prototype and Quality Control Testing of Seismic Isolation Syste~ defines a Pre-Qualification Test series to determine the Ultimate and Reserve Capacity of an Isolation Unit. In order to improve the current guidelines for these tests, NISTIR 5800 recommends testing full-scale and scale-model base isolation units to failure to determine actual failure loads and to investigate whether similitude relationships apply between full scale and scale model units, Reliable prediction of full-scale bearing ultimate capacities from scale model versions is important since the extremely large load-carrying capacity of most seismic isolation units prevents testing to failure in most existing test facilities. As a step in this direction, this report presents test results to determine ultimate compression under zero lateral load for four laminated elastomeric base isolation bearings. Three of the bearings were nearly geometrically similar (referred to in the report as Type B Bearings) full-scale, 1/2 scale, and 1/4 scale models, and were tested to failure. The results of these bearing tests indicate that it may be possible to use scale-models to determine failure loads of full-scale bearings. The stress-strain curves of the Type B Bearings are similar in shape; however, they are not identical. The testing program included only one bearing of each size, and further experiments should be conducted. In a later study, finite element analyses will be conducted to investigate the effect of the geometric dissimilarities on the stress-strain curves of the scale-model bearings. The Type A Bearing was tested first in order to gather experience with the testing procedure and to investigate dependence of bearing response on strain rate. The tests indicate that the bearing response is independent ofloading rate over the range of head speeds obtainable with the test machine I---:(maximum head speed of about 0040 mm/s). KEY WOHOS (MAXIMUM OF 9; 2S·CHARACTERS AND SPACES EACH; SEPARATE WITH SEMICOLONS; ALPHABETIC ORDER; CAPITAUZE ONLY PROPER NAMES) building techri.olog'J: compression testing; earthquake engineering; elastomeric bearings; reserve capacity; seismic base isolA.tion; testing"; ultimate load tests AVAILABIUTY NOTE TO AUTHOR(S): IF YOU DO NOT WISH THIS 0 X· UNUMITED FOR OFFICIAL DISTRIBUTION DO NOT RELEASE TO NTIS MANUSCRIPT ANNOUNCED BEFORE PUBUCATION, ~ ORDER FROM SUPERINTENDENT OF DOCUMENTS, U.S. GPO, WASHINGTON, DC 20402 PLEASE CHECK HERE. 0 ORDER FROM NTIS, SPRINGFIELD, VA 22161

Ultimate capacity testing of laminated elastomeric base isolation bearings under axial loading