Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Effect of Transverse Steel on Shear Performance for RC Bridge Columns

철근콘크리트 원형 교각의 전단성능에 대한 횡방향철근의 영향

  • Ko, Seong Hyun (Department of Civil Engineering, Jeju International University)
  • 고성현 (제주국제대학교 토목공학과)
  • Received : 2020.10.20
  • Accepted : 2021.05.24
  • Published : 2021.09.01
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Abstract

In seismic design, hollow section concrete columns offer advantages by reducing the weight and seismic mass compared to concrete section RC bridge columns. However, the flexure-shear behavior and spirals strain of hollow section concrete columns are not well-understood. Octagonal RC bridge columns of a small-scale model were tested under cyclic lateral load with constant axial load. The volumetric ratio of the transverse spiral hoop of all specimens is 0.00206. The test results showed that the structural performance of the hollow specimen, such as the initial crack pattern, initial stiffness, and diagonal crack pattern, was comparable to that of the solid specimen. However, the lateral strength and ultimate displacement of the hollow specimen noticeably decreased after the drift ratio of 3%. The columns showed flexure-shear failure at the final stage. Analytical and experimental investigations are presented in this study to understand a correlation confinement steel ratio with neutral axis and a correlation between the strain of spirals and the shear resistance capacity of steel in hollow and solid section concrete columns. Furthermore, shear strength components (Vc, Vs·, Vp) and concrete stress were investigated.

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References

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