The Effect of Pre-Damaged Level on Repair Damaged Columns by Using Steel Straps Tensioning Technique

  • Authors

    • Nazirah Mohd Apandi
    • Chau Khun Ma
    • Chee Loong Chin
    • Abdullah Zawawi Awang
    • Wahid Omar
    2018-07-09
    https://doi.org/10.14419/ijet.v7i3.9.15268
  • Confinement, pre-damaged level, steel strapping tensioning techniques, pre-tensioning force.

  • To date, repair of damaged columns has become increasingly more significant. The failure of columns structure contributes to the serious consequences in structural stability. Most of the existing repairing techniques are based on lateral passive confining pressure. However, this passive-type of confinement is ineffective in restoring the performance of damaged concrete columns. In this regards, active confinement was selected in this study to repair damaged concrete columns which can actively confine concrete in this study. Steel strapping tensioning technique (SSTT) allows pre-tensioning low-cost recycled steel straps around the damaged column was chosen herein to represent active confinement. A total of 12 columns were prepared and loaded axially to certain degree of their respective ultimate strength. Hence, a pre-damage level of the columns was developed. Then, the damaged columns repaired by using mortar and confined with SSTT. Finally, the repaired columns were then tested under monotonic uniaxial load. The structural performances of the confined repaired columns were compared with those of the repaired columns without confinement. It is expected that as the concrete compressive strength increases, the effectiveness in restoring the load carrying capacity of the damaged column becomes more significant.

     

     

  • References

    1. [1] Achillopoulou, D. V., & Karabinis, A. I. (2015). Assessment of concrete columns repaired with fiber reinforced mortar through damage indexes and numerical model. Construction and Building Materials, 81, 248–256.

      [2] Al-Salloum, Y. A. (2007). Compressive Strength Models of FRP-Confined Concrete. Asia-Pacific Conference on FRP in Structures, 175–180.

      [3] Amrul Kaish, A. B. M., Alam, M. R., Jamil, M., & Wahed, M. A. (2013). Ferrocement jacketing for restrengthening of square reinforced concrete column under concentric compressive load. Procedia Engineering, 54, 720–728.

      [4] Bansal, P. P., Civil, B. E., & Structures, C. (2014). Effect Of Wire Mesh Orientation On Strength Of Beams Retrofitted Using Ferrocement Jackets. International Journal, 5(2), 8–19.

      [5] Benzaid, R., Mesbah, H., & Chikh, N. E. (2010). FRP-confined concrete cylinders: axial compression experiments and strength model. Journal of Reinforced Plastics and Composites, 29(16), 2469–2488.

      [6] Fardis, M. N., & Khalili, H. (1982). FRP-encased concrete as a structural material. Magazine of Concrete Research, 34(122), 191–202.

      [7] Ganesh Prabhu, G., & Sundarraja, M. C. (2013). Behaviour of concrete filled steel tubular (CFST) short columns externally reinforced using CFRP strips composite. Construction and Building Materials, 47, 1362–1371.

      [8] Ghobarah, A., Aziz, T. S., & Biddah, A. (1997). Rehabilitation of reinforced concrete frame connections using corrugated steel jacketing. ACI Structural Journal, 94(3), 283–294.

      [9] Jayasree, S., Ganesan, N., & Abraham, R. (2016). Effect of ferrocement jacketing on the flexural behaviour of beams with corroded reinforcements. Construction and Building Materials, 121, 92–99.

      [10] Kondraivendhan, B., & Pradhan, B. (2009). Effect of ferrocement confinement on behavior of concrete. Construction and Building Materials, 23(3), 1218–1222.

      [11] Nam, T.-H., Park, J., Yoon, S.-J., & Choi, E. (2009). A new steel jacketing method for RC columns. Magazine of Concrete Research, 61(10), 787–796.

      [12] Shehata, I. A. E. M., Carneiro, V., & Shehata, C. D. (2001). Strength of short concrete columns confined with CFRP sheets. Materials and Structures, 35(245), 50–58.

      [13] Tastani, S. P., & Pantazopoulou, S. J. (2004). Experimental evaluation of FRP jackets in upgrading RC corroded columns with substandard detailing. Engineering Structures, 26(6), 817–829.

      [14] Zahran, E. H. (2016). Effect of GFRP Wraps on HSC Columns Strengthened with GFRP with Different Steel Ratio, (2), 8–12.

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  • How to Cite

    Mohd Apandi, N., Khun Ma, C., Loong Chin, C., Zawawi Awang, A., & Omar, W. (2018). The Effect of Pre-Damaged Level on Repair Damaged Columns by Using Steel Straps Tensioning Technique. International Journal of Engineering & Technology, 7(3.9), 31-33. https://doi.org/10.14419/ijet.v7i3.9.15268