한국지진공학회논문집 (Journal of the Earthquake Engineering Society of Korea)

  • 제11권4호
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  • Pages.1-11
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  • 2007
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  • 1226-525X(pISSN)
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  • 2234-1099(eISSN)
한국지진공학회 (Earthquake Engineering Society of Korea)
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Verification and Mitigation of Seismic Failure in Concrete Piers under Near-field Earthquakes

  • 발행 : 2007.08.31
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초록

This paper verifies the difference of the seismic behavior and seismic damage of the neighboring two reinforced concrete piers damaged by the 1995 Hyogoken Nanbu earthquake. The two piers were almost the same size, carrying slightly different dead load, and were provided with the same reinforcement arrangement except the amount of longitudinal reinforcement at the bottom portion of the piers. The pier with more reinforcement was completely collapsed due to this near field earthquake by shear failure at the longitudinal reinforcement cut-off while the other was only damaged at the bottom by flexure even though the longitudinal reinforcement cut-off was also existed at the mid height of the pier. According to the results of the pseudo dynamic test, the seismic damage was recognized to be greatly dependent on the ground motion characteristics even though the employed ground motions had the same peak acceleration. The severe damage was observed when the test employed the seismic wave that had strong influence to the longer period range compared to the initial natural period of the pier. On the other hand, based on the similar model experiment, the defect of gas-pressure welded splice of longitudinal reinforcement was revealed to save the piers against collapse due to the so-called fail-safe mechanism contrary to the intuitive opinion of some researchers. It was concluded that the primary cause of the collapse of the pier was the extremely strong intensity and peculiar characteristics of the earthquake motion according to both the site-specific and the structure-specific effects.

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참고문헌

  1. Adachi, Y., Ishizaki, H., Ikehata, S., Ikeda, S., 'Verification of the Failure of Reinforced Concrete Piers Under the Near-Field Earthquake,' Proceeding of the 1st fib Congress 2002, Vol. 5, Session 6, Oct. 2002, pp. 389-396
  2. Committee in the Ministry of Construction,' Report on the Damage of Highway Structures by 1995 Hyogoken Nanbu Earthquake (in Japanese)
  3. Ikehata, S., Adachi, Y., Yamaguchi, T., Ikeda S., 'Study on Seismic Behavior of Reinforced Concrete Piers by Pseudo-Dynamic Test,' Proceedings of the Japan Concrete Institute, Vol. 23, No. 3, Jun. 2001, pp. 1255-1260 (In Japanese)
  4. Japan Society of Civil Engineers, JSCE Design Specification for Concrete Structures (Structural Design Part), Mar. 1996 (In Japanese)
  5. Railway Technical Research Institute: 1995 Hyogoken Nanbu Earthquake -Strong Motion Data-, JR Strong Motion Data File, No. 23d, Mar. 1996 (In Japanese)
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  7. Ikeda, S., 'Seismic behavior of reinforced concrete columns and improvement by vertical prestressing,' Proceeding .of the 13th FIP Congress, Amsterdam, May 1998, pp. 879-884
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  9. Dong kyu Park, Yamaguchi, T., Ikeda, S., 'Fundamental study of the Seismic Poperties and Seismic Design of Prestressed Concrete Piers Considering Prestress Levels,' Journal of Prestressed Concrete, Japan, Vol. 43, No. 2, March 2001, pp. 141-148 (In Japanese)
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