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Seismic Performance of Interlocking Spiral Columns and Rectangular Columns Based on Shake Table Tests

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Abstract

Seismic performances of the interlocking spiral columns and rectangular co lumns with cross ties was clarified based on the shaking table experiment, using three-dimensional earthquake simulator facility at the University of California, Berkeley . This study was conducted as a joint research between Tokyo Institute of Technology and the University of California, Berkeley, based on NEES and E-Defense collaboration on bridge structures. Two 1/6-scaled interlocking columns and two rectangular columns were designed and constructed based on the requirements of Japan Road Association and Caltrans design criteria. An interlocking spiral column and a rectangular column had a ratio of short to longer cross-sectional dimension equal to 0.7 (Specimens I-1 and R-1), and this ratio for the other set of specimens was 0.64 (Specimens I-2 and R-2). The center-to-center distance for interlocking spiral column with short to longer cross-sectional dimension ratio of 0.7 was 1.0 times the radius of sp irals (Specimen I-1), and the other was 1.3 times of radius of spiral (Specimen I-2). Tie spacing of the four columns was 37 mm, which corresponds to the minimum requirement of tie spacing based on Caltrans design. It should be noticed here that the 37 mm tie spacing exceeds the upper limit of volumetric tie reinforcement ratio of 1.8% in Japan Road Association criteria. In order to facilitate a meaningful comparison of the seismic performance between the interlocking spiral and rectangular co lumns, and considering the capacity of earthquake simulator facility, yield acceleration of the columns in the longitudinal direction is set as 2.0 m/sec 2 in the four columns. The specimens are excited under three-dimensional ground motions measured at JR Takatori Station during 1995 Kobe, Japan earthquake. The columns were

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Researchers should cite this work as follows:

  • Takashi Matsumoto (2012), "Seismic Performance of Interlocking Spiral Columns and Rectangular Columns Based on Shake Table Tests," http://nees.org/resources/6707.

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