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Title |
Shake Table Response and Analysis of RC Bridge Piers with Lap-Spliced Steel under NFGM
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Authors |
정영수 ; 박창영 ; 홍현기 ; 박지호 ; 심창수 |
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Keywords |
근단층지반운동 ; 원단층지반운동 ; 겹침이음 ; 진동대 ; 유사동적 ; near-fault ground motion ; far-fault ground motion ; lap-spliced ; shake table ; pseudo-dynamic |
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Abstract |
The near-fault ground motion (NFGM) is characterized by a single long period velocity pulse of large magnitude. NFGM's have been observed in recent strong earthquakes, Izmit Turkey (1999), Kobe Japan (1995), Northridge USA (1994), etc. These strong earthquakes have caused considerable damage to infrastructures because the epicenter was close to the urban area, called as NFGM. Extensive research for the near-fault ground motion (NFGM) have been carried out in strong seismic region, but limited research have been done for NFGM in low or moderate seismic regions because of very few records. The purpose of this study is to investigate and analyze the effect of near-fault ground motions on reinforced concrete (RC) bridge piers with lap-spliced longitudinal reinforcing steels. The seismic performance of four RC bridge piers under near-fault ground motions was investigated on the shake table. In addition, a RC bridge pier is subjected to pseudo-dynamic loadings. Test results showed that large residual displacements were observed in RC bridge piers under NFGM. RC specimens on the shake table failed at relatively low displacement ductility, compared with the displacement ductility of RC bridge pier subjected to pseudo-dynamic loadings.
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