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To improve an earthquake-resistance of highway bridge constructed in South Korea before 1992, in this study, it was conducted quasi-static test according to the displacement-controlled (strain control...) method on RC columns reinforced helical bar. In the experiment, fracture behavior of the circular column and its lateral load-displacement was investigated using three types of reinforcing bar, which has 6, 8 and 10 mm of the diameter. As a result, it was confirmed that seismic performance was dependent on reinforcement of helical bar and its size. During the test, the specimen reinforced using helical bar with 8 mm in the diameter was highest in maximum lateral load, of which the value accounted for 130.9 kN. For a diameter of 10 mm, however, it showed an over-reinforcement effect. Therefore, it would be cautious in reinforcing the helical bar, considering the given conditions including cross-section of a pier, amounts of steel bar in the pier and requirement of seismic performance.続きを見る
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