Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Seismic Performance Evaluation of Reinforced Concrete Columns Under Constant and Varying Axial Forces

일정 및 변동 축력을 받는 철근콘크리트 기둥의 내진성능 평가

  • Lee, Do Hyung (Department of Civil, Railroad and Unmanned Systems Engineering, PaiChai University)
  • 이도형 (배재대학교 드론.철도건설공학과)
  • Received : 2023.11.27
  • Accepted : 2023.12.04
  • Published : 2024.01.01
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Abstract

This paper describes the seismic performance evaluation of reinforced concrete bridge columns under constant and varying axial forces. For this purpose, nine identical circular reinforced concrete columns were designed seismically by KIBSE (2021) and KCI (2021). A comparison of lateral forces with theoretical strength shows that the safety factor for columns under varying axial forces is less marginal than those under constant axial forces. In addition, columns under varying axial forces exhibit significant fluctuations in the hysteretic response due to continuously varying axial forces. This is particularly prominent when many varying axial force cycles within a specific lateral loading cycle increase. Moreover, the displacement ductility of columns under varying axial forces does not meet the code-specified required ductility in the range of varying axial forces. All varying axial forces affect columns' strength, stiffness, and displacement ductility. Therefore, axial force variation needs to be considered in the lateral strength evaluation of reinforced concrete bridge columns.

Keywords

Acknowledgement

이 논문은 2021년도 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행되었습니다(No. NRF-2021R1A2C1011617).

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