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Earthquakes and Structures
  Volume 19, Number 2, August 2020 , pages 129-144

Sloped rolling-type bearings designed with linearly variable damping force
Shiang-Jung Wang, Yi-Lin Sung and Jia-Xiang Hong

    In this study, the idea of damping force linearly proportional to horizontal isolation displacement is implemented into sloped rolling-type bearings in order to meet different seismic performance goals. In addition to experimentally demonstrating its practical feasibility, the previously developed analytical model is further modified to be capable of accurately predicting its hysteretic behavior. The numerical predictions by using the modified analytical model present a good match of the shaking table test results. Afterward, several sloped rolling-type bearings designed with linearly variable damping force are numerically compared with a bearing designed with conventional constant damping force. The initial friction damping force adopted in the former is designed to be smaller than the constant one adopted in the latter. The numerical comparison results indicate that when the horizontal isolation displacement does not exceed the designed turning point (or practically when subjected to minor or frequent earthquakes that seldom have a great displacement demand for seismic isolation), the linearly variable damping force design can exhibit a better acceleration control performance than the constant damping force design. In addition, the former, in general, advantages the re-centering performance over the latter. However, the maximum horizontal displacement response of the linearly variable damping force design, in general, is larger than that of the constant damping force design. It is particularly true when undergoing a horizontal isolation displacement response smaller than the designed turning point and designing a smaller value of initial friction damping force.
Key Words
    sloped rolling-type bearing; linearly variable damping; analytical model; shaking table test; acceleration control; residual displacement
Department of Civil and Construction Engineering, National Taiwan University of Science and Technology,
No.43, Sec.4, Keelung Rd., Taipei 10607, Taiwan

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