DOI QR코드

DOI QR Code

Experimentally evaluating the seismic retrofitting of square engineered cementitious composite columns using CFRP

  • Akhtari, Alireza (Civil Engineering Department, Semnan Branch, Islamic Azad University) ;
  • Mortezaei, Alireza (Seismic Geotechnical and High-Performance Concrete Research Centre, Civil Engineering Department, Semnan Branch, Islamic Azad University) ;
  • Hemmati, Ali (Seismic Geotechnical and High-Performance Concrete Research Centre, Civil Engineering Department, Semnan Branch, Islamic Azad University)
  • 투고 : 2020.09.01
  • 심사 : 2021.03.22
  • 발행 : 2021.06.10

초록

The present experimental study evaluated the seismic performance of six engineered cementitious composite (ECC) columns strengthened with carbon fiber reinforced polymer (CFRP) laminates under cyclic lateral loading. The ECC columns damaged and crushed in the first stage of cyclic tests were repaired using the ECC with a certain polyvinyl alcohol (PVA) fiber and strengthened with flexural and sheer CFRP laminates and then re-assessed under the cyclic loading. The effects of some variables were examined on lateral displacement, energy absorption and dissipation, failure modes, crack patterns, load bearing capacity and plasticity, and the obtained results were compared with those of the first stage of cyclic tests. The results showed that retrofitting the ECC columns can improve their performance, plasticity and load-bearing threshold, delayed the concrete failure, changed the failure modes and increased the energy absorbed by the strengthened columns element by over 50%.

키워드

참고문헌

  1. ACI 374.2R-13 (2013), American Concrete Institute, Guide for Testing Reinforced Concrete Structural Elements under Slowly Applied Simulated Seismic Loads.
  2. AL-Gemeel, A.N. and Zhuge, Y. (2018), "Experimental investigation of textile reinforced engineered cementitious composite (ECC) for square concrete column confinement", Constr. Build. Mater., 174, 594-602. https://doi.org/10.1016/j.conbuildmat.2018.04.161.
  3. Al-Gemeel, A.N. and Zhuge, Y. (2019), "Using textile reinforced engineered cementitious composite for concrete columns confinement", Compos. Struct., 210, 695-706. https://doi.org/10.1016/j.compstruct.2018.11.093.
  4. Babaei, A., Mortezaei, A. and Salehian, H. (2019), "Sensitivity analysis of the plastic hinge region in the wall pier of reinforced concrete bridges", Struct. Eng. Mech., 72(6), 675-687. https://doi.org/10.12989/sem.2019.72.6.675.
  5. Cai, J., Pan, J. and Lu, C. (2018), "Mechanical behavior of ECC-encased CFST columns subjected to eccentric loading", Eng. Struct., 162, 22-28. https://doi.org/22-28.10.1016/j.engstruct.2018.02.029.
  6. Dehghani, A., Nateghi-Alahi, F. and Fischer, G. (2015), "Engineered cementitious composites for strengthening masonry infilled reinforced concrete frames", Eng. Struct., 105, 197-208. https://doi.org/10.1016/j.engstruct.2015.10.013.
  7. Deng, M. and Yang, S. (2018), "Cyclic testing of unreinforced masonry walls retrofitted with engineered cementitious composites", Constr. Build. Mater., 177, 395-408. https://doi.org/10.1016/j.conbuildmat.2018.05.132.
  8. Deng, M., Zhang, Y. and Li, Q. (2018), "Shear strengthening of RC short columns with ECC jacket: Cyclic behavior tests", Eng. Struct., 160, 535-545. https://doi.org/10.1016/j.engstruct.2018.01.061.
  9. Ding, Y., Yu, K.Q., Yu, J.T. and Xu, S.L. (2018), "Structural behaviors of ultra-high performance engineered cementitious composites (UHP-ECC) beams subjected to bendingexperimental study", Constr. Build. Mater., 177, 102-115. https://doi.org/10.1016/j.conbuildmat.2018.05.122.
  10. Dirk (2020), Product Data Sheet Pozzocrete 63 Partial Replacement of Portland Cement.
  11. Ebead, U., Shrestha, K.C., Afzal, M.S., El-Refai, A. and Nanni, A. (2016), "Effectiveness of fabric-reinforced cementitious matrix in strengthening reinforced concrete beams", J. Compos. Constr., 21(2), 04016084. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000741.
  12. Favvata, M.J. and Karayannis, C.G. (2014). "Influence of pinching effect of exterior joints on the seismic behavior of RC frames", Earthq. Struct., 6(1), 89-110. https://doi.org/10.12989/eas.2014.6.1.089.
  13. Feldman, D. and Barbalata, A. (1996), Synthetic Polymers: Technology, Properties, Applications, Springer, Netherlands.
  14. Fischer, G. and Li, V.C. (2002), "Influence of matrix ductility on tension-stiffening behavior of steel reinforced engineered cementitious composites (ECC)", ACI Struct. J., 99(1), 104-111.
  15. Gao, S., Zhao, X., Qiao, J., Guo, Y. and Hu, G. (2019), "Study on the bonding properties of Engineered Cementitious Composites (ECC) and existing concrete exposed to high temperature", Constr. Build. Mater., 196, 330-344. https://doi.org/330-344.10.1016/j.conbuildmat.2018.11.136.
  16. Ge, W., Ashour, A.F., Cao, D., Lu, W., Gao, P., Yu, J., Ji, X. and Cai, C. (2019), "Experimental study on flexural behavior of ECC-concrete composite beams reinforced with FRP bars", Compos. Struct., 208, 454-465. https://doi.org/10.1016/j.compstruct.2018.10.026.
  17. Ge, W.J., Ashour, A.F., Ji, X., Cai, C. and Cao, D.F. (2018), "Flexural behavior of ECC-concrete composite beams reinforced with steel bars", Constr. Build. Mater., 159, 175-188. https://doi.org/10.1016/j.conbuildmat.2017.10.101.
  18. Gencturk, B. and Hosseini, F. (2015), "Evaluation of reinforced concrete and reinforced engineered cementitious composite (ECC) members and structures using small-scale testing", Can. J. Civil Eng., 42(3), 164-177. https://doi.org/10.1139/cjce-2013-0445.
  19. Georgiou, A.V. and Pantazopoulou, S.J. (2018), "Flexural capacity of reinforced Strain-Hardening Cementitious Composite Beams: Experimental results and analysis", J. Struct. Eng., 144(12), 04018214. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002215.
  20. Horikoshi, T., Ogawa, A., Saito, T., Hoshiro, H., Fischer, G. and Li, V.C. (2006), "Properties of Polyvinylalcohol fiber as reinforcing materials for cementitious composites", International RILEM Workshop on HPFRCC in Structural Applications.
  21. Hung, C.C. and Chen, Y.S. (2016), "Innovative ECC jacketing for retrofitting shear-deficient RC members", Constr. Build. Mater., 111, 408-418. https://doi.org/10.1016/j.conbuildmat.2016.02.077.
  22. Kang, S.B., Tan, K.H., Zhou, X.H. and Yang, B. (2017), "Influence of reinforcement ratio on tension stiffening of reinforced engineered cementitious composites", Eng. Struct., 141, 251-262. https://doi.org/10.1016/j.engstruct.2017.03.029.
  23. Karayannis, C.G. and Golias, E. (2018), "Full scale tests of RC joints with minor to moderate seismic damage repaired using CFRP sheets", Earthq. Struct., 15(6), 617-627. https://doi.org/10.12989/eas.2018.15.6.617.
  24. Lepech, M.D. and Li, V.C. (2009), "Application of ECC for bridge deck link slabs", RILEM J. Mater. Struct., 42(9), 1185- 1195. https://doi.org/10.1617/s11527-009-9544-5.
  25. Li, V.C. (1992), "Performance driven design of fiber reinforced cementitious composites", 4th International Symposium on Fiber Reinforced Concrete, Chapman and Hall.
  26. Li, V.C. (1992), "Postcrack scaling relations for fiber reinforced cementitious composites", J. Mater. Civil Eng., 4(1), 41-57. https://doi.org/10.1061/(ASCE)0899-1561(1992)4:1(41).
  27. Li, V.C. (1997), "Damage tolerance of engineered cementitious composites", Advances in Fracture Research, Proceedings of 9th ICF Conference on Fracture, 619-630.
  28. Li, V.C. and Leung, C.K.Y. (1992), "Steady-state and multiple cracking of short random fiber composites", J. Eng. Mech.. 118(11), 2246-2264. https://doi.org/10.1061/(ASCE)0733-9399(1992)118:11(2246).
  29. Li, V.C. and Wu, H.C. (1992), "Conditions for pseudo strain-hardening in fiber reinforced brittle matrix composites", J. Appl. Mech. Rev., 45(8), 390-398. https://doi.org/10.1115/1.3119767.
  30. Li, V.C., Wang, S. and Wu, C. (2001), "Tensile strain-hardening behavior of polyvinyl alcohol engineered cementitious composite (PVA-ECC)", ACI Mater. J., 98(6), 483-492.
  31. Mortezaei, A. and Mohsenian, V. (2019), "Reliability-based seismic assessment of multi-story box system buildings under the accidental torsion", J. Earthq. Eng., 1-24. https://doi.org/10.1080/13632469.2019.1692738.
  32. Mortezaei, A. and Ronagh, H.R. (2012), "Plastic hinge length of FRP strengthened RC columns subjected to both far-fault and near-fault ground motions", Scientia Iranica, 19(6), 1365-1378. https://doi.org/10.1016/j.scient.2012.10.010.
  33. Nycon ® (2020), Nycon-PVA RCS15. https://nycon.com/collections/pva-fibers/products/rsc15.
  34. Pourfalah, S., Cotsovos, D.M., Suryanto, B. and Moatamedi, M. (2018), "Out-of-plane behaviour of masonry specimens strengthened with ECC underimpact loading", Eng. Struct., 173, 1002-1018. https://doi.org/10.1016/j.engstruct.2018.06.078.
  35. Redon, C., Li, V.C., Wu, C., Hoshiro, H., Saito, T. and Ogawa, A. (2001), "Measuring and modifying interface properties of PVA fibers in ECC matrix", J. Mater. Civil Eng., 13(6), 399-406. https://doi.org/https://doi.org/10.1061/(ASCE)0899-1561(2001)13:6(399).
  36. Shanour, A.S., Said, M., Arafa, A.I. and Maher, A. (2018), "Flexural performance of concrete beams containing engineered cementitious composites", Constr. Build. Mater., 180, 23-34. https://doi.org/10.1016/j.conbuildmat.2018.05.238.
  37. Singh, S.B., Patil, R. and Munjal, P. (2017), "Study of flexural response of engineered cementitious composite faced masonry structures", Eng. Struct., 150, 786-802. https://doi.org/10.1016/j.engstruct.2017.07.089.
  38. Terzano, R. (2013), "Characterization of different coal fly ashes for their application in the synthesis of zeolite X as cation exchanger for soil remediation", Fresenius Environ. Bull., 14(4), 263.
  39. Toray Carbon Fibers America, Inc., Technical data sheet No. CFA-001, T300.
  40. Varela, S. and Saiidi, M. (2014), "Dynamic performance of novel bridge columns with superelastic CuAlMn shape memory alloy and ECC", Int. J. Bridge Eng., 2(3), 29-58.
  41. Yang, X., Gao, W.Y., Dai, J.G., Lu, Z.D. and Yu, K.Q. (2018), "Flexural strengthening of RC beams with CFRP grid-reinforced ECC matrix", Compos. Struct., 189, 9-26. https://doi.org/10.1016/j.compstruct.2018.01.048.
  42. Zheng, Y., Zhang, L.F. and Xia, L.P. (2018), "Investigation of the behaviour of flexible and ductile ECC link slab reinforced with FRP", Constr. Build. Mater., 166, 694-711. https://doi.org/10.1016/j.conbuildmat.2018.01.188.