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Strengthening of Fire-Damaged Reinforced Concrete Short Columns Using GFPPECC Composites

  • Research Article-Civil Engineering
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Abstract

The study investigated the strengthening effect of glass fiber and polypropylene fiber-based engineered cementitious composites (GFPPECC) on fire-damaged reinforced concrete short exterior columns. Both moderate (500 °C) and high (900 °C) intensities of fire load corresponding to the ISO834 fire curve were adopted. A total of 15 columns (150 mm × 150 mm × 1000 mm) were cast. The columns were grouped as control column (CC), unstrengthened column-(C2, C3), and strengthened column-(C1, C4) with three columns in each group. The columns in group CC were subjected to axial compression up to failure and kept as the standard reference. The columns in the group (C2, C4) and (C1, C3) were fired up to 900 °C and 500 °C, respectively. Compressive loading on C2 and C3 was applied without any strengthening technique. C1 and C4 were repaired and strengthened using GFPPECC. A similar group of columns, namely unstrengthened-(A-C2, A-C3) and strengthened-(A-C1, A-C4) columns, were analyzed numerically using ANSYS. The parametric analysis was carried out from experimental and numerical results. Variations between experimental and numerical results were negligible. The strengthening has restored to about 68% of the stiffness of columns damaged due to moderate fire intensity. The energy absorption, ductility, and modulus of elasticity were also good, with only about less than 10% reduction compared to the control column. The performance of columns shows that the GFPPECC composite was utilized effectively without any debonding. Whereas for high fire intensity, the GFPPECC composite was not fully used, and premature failure has occurred due to the softening of concrete at high temperatures.

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Acknowledgment

The authors wish to extend their gratitude to the Vice-Chancellor of SASTRA University for providing us the laboratory facilities both in the School of Civil Engineering and in SP Forging to complete this research work successfully.

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  1. School of Civil Engineering, SASTRA Deemed University, Thanjavur, 613401, India

    P. Bhuvaneshwari & K. Saravana Raja Mohan

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  1. P. Bhuvaneshwari
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  2. K. Saravana Raja Mohan
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Correspondence to P. Bhuvaneshwari.

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Bhuvaneshwari, P., Mohan, K.S.R. Strengthening of Fire-Damaged Reinforced Concrete Short Columns Using GFPPECC Composites. Arab J Sci Eng 45, 8619–8632 (2020). https://doi.org/10.1007/s13369-020-04795-x

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