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

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Stiffness Degradation Induced by Seismic Loading on a RC Shear Wall

지진하중에 의한 철근콘크리트 전단벽의 강성 저하에 관한 연구

  • Lee, Yun (Department of Civil Engineering, Daejeon University)
  • 이윤 (대전대학교 토목환경공학과)
  • Received : 2022.03.14
  • Accepted : 2022.05.10
  • Published : 2022.06.30
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Abstract

This research describes a quantitative procedure used to estimate the effect of concrete cracking on stiffness degradation of concrete shear walls and provides analytical references for the seismic design of concrete shear walls. As preliminary research on the seismic response of concrete shear walls, nonlinear transient analysis was performed with commercial FE software. The study presents the nonlinear time history analysis results in terms of concrete damage and cracking behavior induced by seismic input motions. By varying the input motions, concrete strength and shear wall thickness, the seismic responses of a shear wall were examined with nonlinear time history analysis, and the progressive cracking behavior and corresponding hysteresis loop were described. Based on the analysis results, frequency and stiffness degradation of the shear wall from progressive concrete damage and cracking were captured with respect to the seismic levels. The results of this study suggest that stiffness degradation from concrete cracking should be appropriately considered when determining the seismic capacity of RC shear wall structures.

본 연구는 균열에 의한 콘크리트 전단벽 강성저하 영향 평가를 위해 수행되었으며, 극한 내지진 하중의 60%까지 재하한 비선형 해석 결과, 사전 균열효과에 의해 비손상 대비 진동수의 12%정도 진동수가 감소하였으며 강성 측면에서 23%정도의 감소현상을 나타냈다. 단계적으로 지진하중의 크기를 증가시킨 비선형 해석 결과, 지진하중의 세기가 커짐에 따라 콘크리트 전단벽체에 전단균열이 발생하여 진전함을 파악하고, 반복이력에 의한 에너지 손실과 강성 저하가 뚜렷하게 발생함을 알 수 있었다. 또한 두 가지 콘크리트 강도와 전단벽 제원에 대하여 지진하중의 크기가 극한 내지진 하중에 근접함에 따라 진동수의 감소량은 비손상 대비 10~40%정도로 나타났으며, 강성의 경우 비손상 대비 40%정도 수준까지 감소할 수 있는 것으로 나타났다.

Keywords

Acknowledgement

This work was supported by Korea Institute of Nuclear Safety(KINS).

References

  1. ACI 349. (2001). Code Requirements for Nuclear Safety-related Concrete Structures and Commentary. American Concrete Institute, Michigan.
  2. Arel, H. S., Aydin, E., and Kore, S. D. (2017), Ageing management and life extension of concrete in nuclear power plants. Powder Technology, 321, 390-408. https://doi.org/10.1016/j.powtec.2017.08.053
  3. ASCE/SEI 43. (2005), Seismic Design Criteria for Structures, Systems and Components in Nuclear Facilities. American Society of Civil Engineers and Structural Engineering Institute, Virginia.
  4. Choubey, R. K., Kumar, S., and Rao, M. C. (2014), Effect of shear-span/depth ratio on cohesive crack and double-K fracture parameters of concrete, Advances in concrete construction, 2(3), 229-247. https://doi.org/10.12989/acc.2014.2.3.229
  5. DCD. (2011), Design control document for the AP1000. U.S. Nuclear Regulatory Commission, Washington, DC.
  6. Habasaki, A., Nishikawa, T., Takiguchi, K., Kitada, Y., and Torita, H. (1999), Multi-Axial Loading Test for RC Wall of Reactor Building. SMiRT-15, H03/3, VI-107-114.
  7. Hiroshi, T., Yoshio, K., Takao, N., Katsuki, T., Hideyoshi, W., and Takeyoshi, K. (2001), Multi-Axis Loading Test on RC Shear Walls Overview and Outline of Two Directional Horizontal Loading Test. Transactions on SMiRT 16, Washington, DC.
  8. Kusama, K., Suzuki, A., Fukuda, R., Hirotani, T., and Takiguchi, K. (2003). Simulation Analysis of Shaking Table Test for RC Seismic Shear Wall in Multi-Axis Loading Tests. SMiRT 17, Prague, Czech Republic.
  9. Mistri, A., Davis, R., and Sarkar, P. (2016), Condition assessment of fire affected reinforced concrete shear wall building-A case study. Advances in concrete construction, 4(2), 89-105. https://doi.org/10.12989/acc.2016.4.2.089
  10. NUREG/CR-6926. (2007), Evaluation of the Seismic Design Criteria in ASCE/SEI Standard 43-05 for Application to Nuclear Power Plants. U.S. Nuclear Regulatory Commission.
  11. Shojaei, F., and Behnam, B. (2017), Seismic vulnerability assessment of low-rise irregular reinforced concrete structures using cumulative damage index, Advances in concrete construction, 5(4), 407-422. https://doi.org/10.12989/acc.2017.5.4.407
  12. Sogbossi, H., Verdier, J., and Multon, S. (2017), Impact of reinforcement-concrete interfaces and cracking on gas transfer in concrete. Construction and Building Materials, 157, 521-533. https://doi.org/10.1016/j.conbuildmat.2017.09.095
  13. Syed, S., and Gupta, A. (2015), Seismic fragility of RC shear walls in nuclear power plant part 2: Influence of uncertainty in material parameters on fragility of concrete shear walls. Nuclear Engineering and Design, 295, 587-596. https://doi.org/10.1016/j.nucengdes.2015.09.038
  14. Torita, H., Matsumoto, R., Kitada, Y., Kusama, K., and Nishikawa, T. (2004), Shaking table test of RC box-type shear wall in multi-axes loading. In: 13th World Conference on Earthquake Engineering, Vancouver, BC, Canada.
  15. US-APWR. (2011), Design document. Seismic Design Bases of the US-APWR Standard Plant. MUAP-10001, Rev. 4, Mitsubishi Heavy Industries, Ltd.
  16. Wang, S. (2018), Analytical evaluation of the dome-cylinder interface of nuclear concrete containment subjected to internal pressure and thermal load. Engineering Structures, 161, 1-7. https://doi.org/10.1016/j.engstruct.2018.01.063
  17. Zhou, Y., Xu, B., Pang, R., Zou, D., and Kong, X. (2018), Stochastic seismic response and stability reliability analysis of a vertical retaining wall in front of the pumping station of a nuclear power plant using the probability density evolution method. Nuclear Engineering and Design, 334, 110-120. https://doi.org/10.1016/j.nucengdes.2018.05.008