The paper reports the results of an experimental investigation on the effect of elevated temperature exposure on the mechanical response of concrete members strengthened with PBO-FRCM composites. Fourteen direct shear (DS) tests on PBO-FRCM prisms and four flexural tests on RC beams either un-strengthened or PBO FRCM strengthened were performed over a temperature range from 20°C to 300 °C. Afgter being exposed to elevated temperatures, specimens were cooled naturally to room temperature and tested until failure. The obtained results confirm that the effect of the temperature on the FRCM-to-concrete bond behavior is a matter of concern for building applications: at 300 °C, the retained bond strength was almost -60% of the ambient temperature vakues. On the other hand, the flexural behavior of the FRCM strengthened RC beams seems to the much less affected by elevated temperature: in fact, the ultimate loads demonstrated negligible reductions for the tested range of tempertaure.

Effect of the elevatd temperatures on the structural response of PBO-FRCM systems and PBO-FRCM strengthened reinforced concrete beams

Pietro Mazzuca;Luciano Ombres
;
Marielda Guglielmi;Salvatore Verre
2022

Abstract

The paper reports the results of an experimental investigation on the effect of elevated temperature exposure on the mechanical response of concrete members strengthened with PBO-FRCM composites. Fourteen direct shear (DS) tests on PBO-FRCM prisms and four flexural tests on RC beams either un-strengthened or PBO FRCM strengthened were performed over a temperature range from 20°C to 300 °C. Afgter being exposed to elevated temperatures, specimens were cooled naturally to room temperature and tested until failure. The obtained results confirm that the effect of the temperature on the FRCM-to-concrete bond behavior is a matter of concern for building applications: at 300 °C, the retained bond strength was almost -60% of the ambient temperature vakues. On the other hand, the flexural behavior of the FRCM strengthened RC beams seems to the much less affected by elevated temperature: in fact, the ultimate loads demonstrated negligible reductions for the tested range of tempertaure.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11770/337043
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