Structural Engineering and Mechanics

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Seismic performance of RC columns retrofitted using high-strength steel strips under high axial compression ratios

  • Yang, Yong (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Hao, Ning (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Xue, Yicong (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Feng, Shiqiang (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Yu, Yunlong (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Zhang, Shuchen (School of Civil Engineering, Xi'an University of Architecture & Technology)
  • Received : 2022.06.19
  • Accepted : 2022.09.20
  • Published : 2022.11.10
⟨ Previous Next ⟩

Abstract

In this paper, the impact on seismic performance of an economical effective technique for retrofitting reinforced concrete (RC) columns using high-strength steel strips under high axial compression ratios was presented. The experimental program included a series of cyclic loading tests on one nonretrofitted control specimen and three retrofitted specimens. The effects of the axial compression ratio and spacing of the steel strips on the cyclic behavior of the specimens were studied. Based on the test results, the failure modes, hysteretic characteristics, strength and stiffness degradation, displacement ductility, and energy dissipation capacity of the specimens were analyzed in-depth. The analysis showed that the transverse confinement provided by the high-strength steel strips could effectively delay and restrain diagonal crack development and improve the failure mode, which was flexural-shear failure controlled by flexural failure with better ductility. The specimens retrofitted using high-strength steel strips showed more satisfactory seismic performance than the control specimen. The seismic performance and deformation capacity of the retrofitted RC columns increased with decreasing axial compression ratio and steel strip spacing. Based on the test results, a hysteretic model for RC columns that considers the transverse confinement of high-strength steel strips was then established. The hysteretic model showed good agreement with the experimental results, which verified the effectiveness of the proposed hysteretic model. Therefore, the aforementioned analysis can be used for the design of retrofitted RC columns.

Keywords

Acknowledgement

This work was supported by Basic Research Program of Natural Science of Shaanxi Province (Program No. 2019JC-30) and the National Natural Science Foundation of China (Program No. 51978565). The financial supports are highly appreciated. In addition, most authors of the paper are members of the Youth Innovation Team of Shaanxi Universities.

References

  1. Amsyar, F., Khun, M.C., Omar, W., Awang, A.Z. and Ngian, S.P. (2019), "Behaviour of lightweight foamed concrete with pre-tensioning steel straps confinement", Earth Environ. Sci., 220(1), 012020. https://doi.org/10.1088/1755-1315/220/1/012020.
  2. Chen, Q.W., Shin, M. and Andrawes, B. (2014), "Experimental study of non-circular concrete elements actively confined with shape memory alloy wires", Constr. Build. Mater., 14(61), 303-311. https://doi.org/10.1016/j.conbuildmat.2014.02.076.
  3. Colajanni, P., Recupero, A. and Spinella, N. (2017), "Increasing the shear capacity of reinforced concrete beams using pretensioned stainless steel ribbons", Struct. Concrete, 18(3), 444-453. https://doi.org/10.1002/suco.201600089.
  4. Feng, P., Qiang, H.L. and Ye, L.P. (2017), "Discussion and definition on yield points of materials, members and structures", Eng. Mech., 34(3), 36-46. (in Chinese)
  5. Frangou, M., Pilakoutas, K. and Dritsos, S. (1995), "Structural repair/strengthening of RC columns", Constr. Build. Mater., 9(5), 259-266. https://doi.org/10.1016/0950-0618(95)00013-6.
  6. Guo, Z.H. (2013), Theory of Reinforced Concrete, 3th Edition, Tsinghua University Press, Beijing, China.
  7. Hadi, M.N.S., Pham, T.M. and Lei, X. (2013), "New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps", J. Compos. Constr., 17(2), 229-238. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000335.
  8. Helal, Y., Garcia, R., Pilakoutas, K., Guadagnini, M. and Hajirasouliha, I. (2016), "Strengthening of short splices in RC beams using post-tensioned metal straps", Mater. Struct., 49(1), 133-147. https://doi.org/10.1617/s11527-014-0481-6.
  9. Holmes, N., Niall, D. and O'shea, C. (2015), "Active confinement of weakened concrete columns", Mater. Struct., 48(9), 2759-2777. https://doi.org/10.1617/s11527-014-0352-1.
  10. Imjai, T., Chaisakulkiet, U., Garcia, R. and Pilakoutas, K. (2018), "Strengthening of RC members using post-tensioned metal straps: State of the research", Lowland Technol. Int., 20(2), 109-118.
  11. Imjai, T., Setkit, M., Garcia, R., Sukontasukkul, P. and Limakatanyu, S. (2020), "Seismic strengthening of low strength concrete columns using high ductile metal strap confinement: A case study of Kindergarten School in Northern Thailand", Walailak J. Sci. Technol. (WJST), 17(12), 1335-1347. https://doi.org/10.48048/wjst.2020.10738
  12. JGJ/T 101-2015 (2015), Specification for Seismic Test of Buildings, Ministry of Housing and Urban-Rural Development, PRC, Beijing, China.
  13. Karayannis, C.G. and Sirkelis, G.M. (2008), "Strengthening and rehabilitation of RC beam-column joints using carbon-FRP jacketing and epoxy resin injection", Earthq. Eng. Struct. Dyn., 37(5), 769-790. https://doi.org/10.1002/eqe.785.
  14. Lee, H.P., Awang, A.Z. and Omar, W. (2014), "Effect of confining layers of steel straps confined high-strength concrete cylinder under uniaxial cyclic compression", J. Teknologi, 70(1), 85-91. https://doi.org/10.11113/jt.v70.2384.
  15. Ma, C.K., Awang, A.Z., Omar, W., Liang, M., Jaw, S.W. and Azimi, M. (2016). "Flexural capacity enhancement of rectangular high-strength concrete columns confined with post-tensioned steel straps: Experimental investigation and analytical modelling", Struct. Concrete, 17(4), 668-676. https://doi.org/10.1002/suco.201500123.
  16. Marthong, C. (2019), "Rehabilitation and strengthening of exterior RC beam column connections using epoxy resin injection and FRP sheet wrapping: Experimental study", Struct. Eng. Mech., 72(6), 723-736. https://doi.org/10.12989/sem.2019.72.6.723.
  17. Mercimek, O., Anil, O., Ghoroubi, R., Sakin, S. and Yilmaz, T. (2021), "Experimental and numerical investigation of RC column strengthening with CFRP strips subjected to low-velocity impact load", Struct. Eng. Mech., 79(6), 749-765. https://doi.org/10.12989/sem.2021.79.6.749.
  18. Moghaddam, H., Samadi, M. and Pilakoutas, K. (2010b), "Compressive behavior of concrete actively confined by metal strips, Part B: Analysis", Mater. Struct., 43(10), 1383-1396. https://doi.org/10.1617/s11527-010-9589-5.
  19. Moghaddam, H., Samadi, M., Pilakoutas, K. and Mohebbi, S. (2010a), "Axial compressive behavior of concrete actively confined by metal strips; Part A: experimental study", Mater. Struct., 43(10), 1369-1381. https://doi.org/10.1617/s11527-010-9588-6.
  20. Park, Y.J. and Ang, A.H-S (1985), "Mechanistic seismic damage model for reinforced concrete", J. Struct. Eng., 111(4), 722-739. https://doi.org/10.1061/(ASCE)0733-945(1985)111:4(722).
  21. Sabri, A. (2013), "Seismic retrofit of concrete columns by transverse prestressing", University of Ottawa, Canada.
  22. Samadi, M., Moghaddam, H. and Pilakoutas, K. (2012), "Seismic retrofit of RC columns with inadequate lap-splice length by external post-tensioned high-strength strips", Proceedings of the 15 World Conference on Earthquake Engineering, Lisbon, Portugal, September.
  23. Sirimontree, S., Keawsawasvong, S. and Thongchom, C. (2021), "Reinforced concrete columns confined with prestressed steel straps under axial loading", J. Appl. Sci. Eng., 24(3), 401-406. https://doi.org/10.6180/jase.202106_24(3).0015 .
  24. Tan, J.Y., Ma, C.K., Chin, C.L., Awang, A.Z. and Omar, W. (2020), "Experimental study on the effect of strengthening inadequate seismically designed column using pre-tensioned steel straps confinement", Earth Environ. Sci., 498(1), 012038. https://doi.org/10.1088/1755-1315/498/1/012038.
  25. Villar-Salinas, S., Guzman, A. and Carrillo, J. (2021), "Performance evaluation of structures with reinforced concrete columns retrofitted with steel jacketing", J. Build. Eng., 33, 101510. https://doi.org/10.1016/j.jobe.2020.101510.
  26. Wang, D.Y., Wang, Z.Y., Smith, S.T. and Yu, T. (2017), "Seismic performance of CFRP-confined circular high-strength concrete columns with high axial compression ratio", Constr. Build. Mater., 134, 91-103. https://doi.org/10.1016/j.conbuildmat.2016.12.108.
  27. Yang, K.H. (2019), "Axial behavior of reinforced concrete columns strengthened with new section enlargement approaches", ACI Struct. J., 116(5), 87-96. https://doi.org/10.14359/51715631.
  28. Yang, Y., Xue, Y.C., Yu, Y.L. and Li, Y.Q. (2020), "Research on axial behaviour of concrete columns retrofitted with pre-stressed steel strips", Mag. Concrete Res., 72(21), 1089-1101. https://doi.org/10.1680/jmacr.18.00107.
  29. Yu, Y.L., Yang, Y., Xue, Y.C., Wang, N.N. and Liu, R.Y. (2020), "Cyclic tests on RC joints retrofitted with pre-stressed steel strips and bonded steel plates", Struct. Eng. Mech., 75(6), 675-684. https://doi.org/10.12989/sem.2020.75.6.675.
  30. Zhang, B., Yang, Y., Wei, Y.F., Liu, R.Y., Ding, C. and Zhang, K.Q. (2015), "Experimental study on seismic behavior of reinforced concrete column retrofitted with prestressed steel strips", Struct. Eng. Mech., 55(6), 1139-1155. https://doi.org/10.12989/sem.2015.55.6.1139.