Effect of Relative Displacements Between Adjacent Bridge Segments

by K. Kasai, W.D. Liu and V. Jeng

Kasai, K., W.D. Liu and V. Jeng (1992). Effect of Relative Displacements Between Adjacent Bridge Segments. SMIP92 Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 9-1 - 9-12.

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This paper presents the results of a study on the responses of the San Juan Bautista 101/156 Separation Bridge instrumented by the California Division of Mines and Geology under its Strong Motion Instrumentation Program (CSMIP). The bridge experienced three significant earthquakes as follows: 1979 Coyote Lake earthquake (before seismic retrofit), 1984 Morgan Hill earthquake (after seismic retrofit), and 1989 Loma Prieta earthquake. The recorded seismic responses during the three earthquakes are analyzed and correlated with theoretically predicted responses. Adjustments of structural parameters and modeling concept to achieve satisfactory correlations are discussed. Important characteristics of relative motions between adjacent bridge segments are explained based on the records and analyses. Comments are also given regarding the performance of cable restrainers for seismic damage mitigation.