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J. Ocean Eng. Technol. 2001;15(1):98-103.
Comparative Study of Design Codes on the Transverse Steel Amount of Circular Reinfored Concrete Columns
철근콘크리트 원형단면교각의 횡방향철근량에 관한 설계비교
(주)미산건설,대구공업대학 토목과,경일대학교 토목공학과
Key Words: Seismic design, Transverse reinforcement, Extreme-fiber compression strain, Tesponse modification factor, Axial load, Effective stiffness
핵심용어: 내진설계, 횡방향철근, 극한변형률, 응답수정계수, 축력, 유효강성
This paper is conducted to compare the seismic design standard of a bridge column such as the Korean Bridge Design Standard(KBDS), EC 8, NZS 3101 and ATC 32. The KBDS adopted the seismic design requirements in 1992. The earthquake magnitude in Korea is compared with those in the west coast of the USA. It may be said that the current seismic design requirements of the KBDS provides design results, that are too conservative especially for transverse reinforcement details and amounts in reinforced concrete columns. This fact usually creates construction problems in concrete casting, due to congestion of transverse reinforcement. Furthermore, the effective stiffness; $I_{eff}$ depends on both the axial load P/$A_gF_{ck}$ and the longitudinal reinforcement ratio $A_{st}/A_g, so it is the conservative to use the effective stiffness I$_{eff}$ than the gross section stiffness Ig. Seismic design for the transverse reinforcement content of the concrete column was analyzed and considered to have an extreme-fiber compression strain, response modification factor, axial load and effective stiffness etc.c.
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