Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
권호 표지
DOI QR코드

DOI QR Code

Investigating the Influence of Rate Dependency and Axial Force on the Seismic Performance Evaluation of Isolation Bearing

면진받침의 내진성능평가를 위한 실험 시 속도의존성과 수직하중의 영향

  • 박민석 (명지대학교 하이브리드구조실험센터) ;
  • 채윤병 (서울대학교 건설환경공학부/건설환경종합연구소) ;
  • 김철영 (명지대학교 토목환경공학과)
  • Received : 2023.10.05
  • Accepted : 2023.11.01
  • Published : 2023.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

In the evaluation of seismic performance for structural materials and components, the loading rate and axial force can have a significant impact. Due to time-delay effects between input and output displacements, It is difficult to apply high-rate displacement in cyclic tests and hybrid simulations. Additionally, the difficulty of maintaining a consistent vertical load in the presence of lateral displacement has limited fast and real-time tests performed while maintaining a constant vertical load. In this study, slow, fast cyclic tests and real-time hybrid simulations were conducted to investigate the rate dependency and the influence of vertical loads of Isolation Bearing. In the experiment, the FLB System including an Adaptive Time Series (ATS) compensation and a state estimator was constructed for real-time control of displacement and vertical load. It was found that the vertical load from the superstructure and loading rate can have a significant impact on the strength of the seismic isolation bearing and its behavior during an earthquake. When conducting experiments for seismic performance evaluation, they must be implemented to be similar to reality. This study demonstrates the excellent performance of the system built and used for seismic performance evaluation and enables accurate and efficient seismic performance evaluation.

재료 및 부재의 내진성능평가 실험 시 재하속도와 수직하중은 성능에 중대한 영향을 미칠 수 있다. 반복 가력 및 하이브리드 실험 시 재하속도는 입력 변위와 출력 변위 사이의 시간 지연현상으로 인해 고속으로 제어하기 어려우며 횡방향 변위에 의해 수직하중을 일정하게 유지하는 것이 어려워 일정한 수직하중이 유지되는 고속 및 실시간 실험은 거의 이루어지지 않았다. 본 연구에서는 면진받침의 속도 의존성과 수직하중의 영향을 조사하기 위해 저속 및 고속 반복 가력 실험과 실시간 하이브리드 실험을 수행하였다. 실험에서 수평 변위와 수직 하중의 실시간 제어를 위해 Adaptive Time Series(ATS) 보정 방법과 State estimator가 포함된 FLB System을 구축하였다. 고속 또는 실시간으로 재하되는 수평 변위 제어 속도와 상부구조물에 의한 수직하중은 면진받침의 강도 및 지진 시 거동에 상당한 영향을 미칠 수 있음을 확인하였으며 내진성능평가를 위한 실험 시 실제와 유사하도록 구현되어야함을 알 수 있었다. 본 연구는 내진성능평가를 위해 구축하고 사용된 시스템의 우수한 성능을 보여주며 정확하고 효율적인 내진성능평가가 가능하도록 하였다.

Keywords

Acknowledgement

본 연구는 2022년도 교육부의 재원으로 한국기초과학지원 연구원 국가연구시설장비진흥센터의 지원을 받아 수행된 연구임(2022R1A6C103B771).

References

  1. Boyce, B. L., and Dilmore, M. F. (2009). The dynamic tensile behavior of tough, ultrahigh-strength steels at strain-rates from 0.0002s-1 to 200s-1, International Journal of Impact Engineering, 36(2), 263-271. https://doi.org/10.1016/j.ijimpeng.2007.11.006
  2. Kim, J. H., Kim, D. Y., Han, H. N., Barlat F., and Lee, M. G. (2013), Strain rate dependent tensile behavior of advanced high strength steels: Experiment and constitutive modeling, Materials Science & Engineering, A 559, 222-231. https://doi.org/10.1016/j.msea.2012.08.087
  3. Yu, H., Guo, Y., and Lai, X. (2009), Rate-dependent behavior and constitutive model of DP600 steel at strain rate from 10-4 to 10-3s-1, Materials and Design, 30(7), 2501-2505. https://doi.org/10.1016/j.matdes.2008.10.001
  4. Cusatis, G. (2011), Strain-rate effects on concrete behavior, International Journal of Impact Engineering, 38(4), 162-170. https://doi.org/10.1016/j.ijimpeng.2010.10.030
  5. Chen, X., Wu, S., Zhou, J., Chen, Y., and Qin, A. (2013), Effect of Testing Method and Strain Rate on Stress-Strain Behavior of Concrete, Journal of Materials in Civil Engineering, 25(11), Iss.11.
  6. Newell, J. and Uang, C. M. (2006), Cyclic Behavior of Steel Columns with Combined High Axial Load and Drift Demand, Structural Systems Research Project, University of California, San Diego.
  7. Hwang, S. J., Hwang, G. J., Chang, F. C., Chen, Y. C., and Lin, K. C. (2013), Design of Seismic Confinement of Reinforced Concrete Columns Using High Strength Materials, ACI Symposium Paper, 293.
  8. Monteiro, A., Arede, A., and Pouca, N. V. (2017), Seismic behavior of coupled column bridge RC piers: Experimental campaign, Engineering Structures, 132, 399-412. https://doi.org/10.1016/j.engstruct.2016.11.028
  9. Park, M.S., Kim, C.Y., Han, J.W., and Chae, Y. (2021), Loading Rate Effect on the Lateral Response of H-Shape Steel Column, KSCE Journal of Civil and Environmental Engineering Research, 41(6), 637-644 (in Korean). https://doi.org/10.12652/KSCE.2021.41.6.0637
  10. Chae, Y., Lee, J.H., Park, M.S., and Kim, C.Y. (2019), Fast and Slow Cyclic Tests for Reinforced Concrete Columns with an Improved Axial Force Control, Journal of Structural Engineering, 145(6), 04019044.
  11. Lee, K. W. and Oh, S. H. (2022), Effect of Load Velocity on Seismic Performance of Steel Beam-column Connection, Journal of the Korea Institute for Structural Maintenance and Inspection, 26(6), 182-192 (in Korean).
  12. Lee, H. H. (2013), Displacement and Velocity Dependence of Clamped Shape Metallic Dampers, Journal of the Korea Institute for Structural Maintenance and Inspection, 17(2), 062-070 (in Korean). https://doi.org/10.11112/jksmi.2013.17.2.062
  13. Chae, Y., Lee, Kazemibidokhti, K., and Ricles, J. M. (2013), Adaptive time series compensator for delay compensation of servo-hydraulic actuator systems for real-time hybrid simulation, Earthquake Engineering & Structural Dynamics, 42(11), 1697-1715. https://doi.org/10.1002/eqe.2294