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Title |
A Seismatic Performance Analysis of Circular RC Bridge Piers Ⅰ. Evaluation of Influence Parameters of Confinement Steel Ratio
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Keywords |
원형 철근콘크리트 교각; 내진성능평가; 내진영향인자; 축하중비; 구속철근비; circular RC bridge pier; evaluation of seismic performance; influence factor; axial force ratio; confinement steel ratio |
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Abstract |
For the establishment of rational seismic design code for RC (reinforced concrete) bridge pier, this paper has analyzed the seismic code of RC bridge pier specified in )veil-known codes such as KHBDS (Korea Highway Bridge Design Specification), AASHTO Standard, ATC-32, Eurocode 8, NZS 3101, etc. So as to secure aseismic ductility of RC pier, transverse confinement steel ratios of those codes have been examined together with other design parameters such as strength of concrete and reinforcing steel, axial force ratio, aspect ratio, longitudinal steel ratio, etc. However, there has been arisen a doubt for the validity of those parameters. Thus, the objective of this study is to quantitatively evaluate the validity of design parameter of each code on the experimental seismic ductility for about 80 test specimens. It was concluded from this study that the axial force ratio is a dominant factor for the seismic displacement ductility. Therefore, it Is desirable that the axial force ratio be further taken into account in the corresponding seismic design formula of RC bridge pier in current KHBDS.
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