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Strength Analysis of Reinforced Concrete Beams Affected by Fire Using Glass Fiber Sheet and PP Fiber ECC as Binders

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Abstract

Flexure study on (100 mm × 150 mm × 1500 mm) unstrengthened fire-affected (FD) beams and strengthened fire-affected (FDS) beams is presented in this paper. The parameters considered were different intensities of fire, load deflection behavior, spalling, crack pattern, stiffness, ductility and energy absorption. The three phases (300, 500 and 900 °C) of ISO834 fire curve were achieved in oil-burnt furnace of 250 kg capacity. The cooled beams were repaired for cracking and spalling and cured. The strengthening of repaired beams was achieved using glass fiber sheet with PP ECC (polypropylene engineered cementitious concrete) as binders. Numerical thermal stress analyses were carried out (ANSYS) for a thermal load of 300 °C. Data from flexure test showed that strengthening was effective for beam members affected by fire up to 500 °C, by shifting brittle shear failure to ductile flexural failure and improving the stiffness, energy absorption and ductility. Strengthening could not enhance the load deflection behavior and could not stop brittle shear failure if the fire loading in members exceeded 500 °C. Present technique could restore the strength and stiffness in members affected by medium fire intensity in an effective way, without carrying out any major repair for the damages.

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Acknowledgments

The authors extend their sincere thanks to Vice Chancellor of SASTRA University for providing us with the laboratory facilities both in School of Civil Engineering and in Shanmuga Precision Forging to successfully complete this research work.

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Authors and Affiliations

  1. School of Civil Engineering, SASTRA University, Thanjavur, Tamilnadu, 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., Saravana Raja Mohan, K. Strength Analysis of Reinforced Concrete Beams Affected by Fire Using Glass Fiber Sheet and PP Fiber ECC as Binders. Iran J Sci Technol Trans Civ Eng 41, 37–47 (2017). https://doi.org/10.1007/s40996-016-0029-9

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  • DOI: https://doi.org/10.1007/s40996-016-0029-9

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