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1SčėÔâè¤c±«ğ611-0011 SčÍPEĠ E-mail:[email protected]

2SčâèæčäU°^~Ąç ğ615-8540 SčûSoSčÅĠ E-mail:[email protected]

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Key Words : Unbonded bar reinforced concrete, Dynamic response, Dynamic loading, Shake table test

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Û¬ïbhGcçnhÖåï Vol.27, Paper No.196ï 2003qñ

DYNAMIC RESPONSE BEHAVIOR OF UNBONDED BAR REINFORCED CONCRETE STRUCTURE

Yoshikazu TAKAHASHI, Yoshihide IMOTO and Takanori WATAJIMA

Unbonded Bar Reinforced Concrete (UBRC) structure was developed as a high seismic performance pier because of its positive second stiffness. In this study, the dynamic response behavior is investigated by dynamic cyclic loading tests and shake table tests. In the dynamic loading tests, it is found that the loading rate dependency in UBRC structure is not significant and the second stiffness of UBRC structure can be expected even in the high speed rate. In the shake table tests, the 3D dynamic response behavior was investigated and it is found that the hysteresis loop of UBRC structure in the primary response direction has the positive and stable second stiffness and small residual deformation even after earthquakes. As the results, it is clear that UBRC structures have high seismic performance.

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