DOI QR코드

DOI QR Code

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

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).

References

  1. Lee DH, Choi E, Zi G. Evaluation of earthquake deformation and performance for RC bridge piers. Engineering Structures. 2005;27:1451-1464. https://doi.org/10.1016/j.engstruct.2005.04.009
  2. Lee DH. Experimental evaluation of the seismic performance and engineering damage state of reinforced concrete columns. EESK Journal of Earthquake Engineering. 2023;27(2):119-127. https://doi.org/10.5000/EESK.2023.27.2.119
  3. Saadeghvariri M, Foutch DA. Dynamic behavior of R/C highway bridges under the combined effect of vertical and Horizontal earthquake motions. Earthquake Engineering and Structural Dynamics. 1991;20:535-549. https://doi.org/10.1002/eqe.4290200604
  4. Broderick BM, Elnashai AS. Analysis of the failure of Interstate 10 freeway ramp during the Northridge earthquake of 17 January 1994. Earthquake Engineering and Structural Dynamics. 1995;24(2):189-208. https://doi.org/10.1002/eqe.4290240205
  5. Lee DH, Elnashai AS. Inelastic seismic response analysis of RC bridges including flexure-shear-axial interaction. Structural Engineering and Mechanics. 2002:13;241-260. https://doi.org/10.12989/sem.2002.13.3.241
  6. Yu CP. Effect of vertical earthquake components on bridge responses. PhD Thesis, University of Texas at Austin; c1996.
  7. Button MR, Cronin CJ, Mayes RL. Effect of vertical motions on seismic response of bridges. Journal of Structural Engineering, ASCE. 2002;128(12):1551-1564. https://doi.org/10.1061/(ASCE)0733-9445(2002)128:12(1551)
  8. Kunnath SK, Erduran E, Chai Y, Yashinsky M. Effect of near-fault vertical ground motions on seismic response of highway overcrossings. Journal of Bridge Engineering. 2008;13(3):282-290. https://doi.org/10.1061/(ASCE)1084-0702(2008)13:3(282)
  9. Kim SJ, Holub CJ, Elnashai, AS. Analytical assessment of the effect of vertical earthquake motion on RC bridge piers. Journal of Structural Engineering, ASCE. 2011;137(2):252-260. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000306
  10. Lee DH, Kim D, Park T. Earthquake response analysis of RC bridges using simplified modeling approaches. Journal of Sound and Vibration. 2009a;324(3-5):640-665. https://doi.org/10.1016/j.jsv.2009.02.008
  11. Lee DH, Kim D, Lee K. Analytical approach for the earthquake performance evaluation of repaired/retrofitted RC bridge piers using time-dependent element. Nonlinear Dynamics. 2009b;56:463- 482. https://doi.org/10.1007/s11071-008-9440-5
  12. Lee DH, Park J, Lee K, Kim BH. Nonlinear seismic assessment for the post-repair response of RC bridge piers. Composites Part B. 2011;42:1318-1329. https://doi.org/10.1016/j.compositesb.2010.12.023
  13. KIBSE (Korean Institute of Bridge and Structural Engineers) Concrete Bridge Design (Limit State Design Method) (KDS 24 14 21) Design Code and Commentary. Seoul Korea: KIBSE; c2021 (In Korean).
  14. KCI (Korean Concrete Institute) Structural Concrete Design Code and Commentary. Seoul Korea: KCI; c2021 (In Korean).
  15. Ang BG, Priestley MJN, Paulay T. Seismic shear strength of circular reinforced concrete columns. ACI Structural Journal. 1989;86(1):45-59.