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<p>The axial compressive strength behaviour of CFRP-confined concrete cylinders exposed to elevated temperatures is critical for structural performance in fire-prone environments. While CFRP confinement enhances strength and ductility at ambient conditions, its behaviour after exposure to high temperature requires further investigation. This study examines CFRP-wrapped concrete cylinders after exposed to temperatures ranging from 100 to 400&#xa0;°C to evaluate their strength retention and failure mechanisms in two conditions say wrapping before and after hear exposure. Experiments were performed as a comparative analysis between the specimens unwrapped, wrapped before heat exposure and wrapped after heat exposure. Experimental results indicate that CFRP confinement improves axial compressive strength by up to 2.5 times at room temperature compared to unconfined specimens. However, as temperature increases, the strength retention decreases due to the degradation of the CFRP-polymer matrix. Upto 200&#xa0;°C, CFRP-confined specimens retain nearly 80% of their original strength, while at 300&#xa0;°C, the retention drops to around 30%<b>.</b> Beyond 400&#xa0;°C, the confinement effect becomes negligible for pre-wrapped specimens, with severe structural degradation observed. Despite this, CFRP-confined concrete still outperforms unconfined concrete, which experiences a more rapid strength loss. The stress–strain analysis of the specimens indicates that the wrapping of specimens in both conditions improve the strength and ductility as the pattern show strain hardening behaviour. Post wrapped specimens show better retention in strength and stress–strain pattern even after 400&#xa0;°C, whereas the pre-wrapped specimens show inefficiency after 300&#xa0;°C. These findings highlight the need for fire-resistant composite materials to enhance CFRP’s thermal stability for structural applications in high-temperature environments. Artificial Neural networks and Support vector Regression models were developed to anticipate the axial compressive strength of CFRP wrapped concrete cylinders exposed to elevated temperatures. According to the results, ensemble ANN model and ensemble SVR models achieved about 88% and 71% accuracy with error of 0.26 and − 4.4 respectively.</p>

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Experimental and data-driven modelling of axial load performance of CFRP-wrapped concrete cylinders exposed to elevated temperatures

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Komma Hemanth Kumar Reddy,
  • P. Parthiban

摘要

The axial compressive strength behaviour of CFRP-confined concrete cylinders exposed to elevated temperatures is critical for structural performance in fire-prone environments. While CFRP confinement enhances strength and ductility at ambient conditions, its behaviour after exposure to high temperature requires further investigation. This study examines CFRP-wrapped concrete cylinders after exposed to temperatures ranging from 100 to 400 °C to evaluate their strength retention and failure mechanisms in two conditions say wrapping before and after hear exposure. Experiments were performed as a comparative analysis between the specimens unwrapped, wrapped before heat exposure and wrapped after heat exposure. Experimental results indicate that CFRP confinement improves axial compressive strength by up to 2.5 times at room temperature compared to unconfined specimens. However, as temperature increases, the strength retention decreases due to the degradation of the CFRP-polymer matrix. Upto 200 °C, CFRP-confined specimens retain nearly 80% of their original strength, while at 300 °C, the retention drops to around 30%. Beyond 400 °C, the confinement effect becomes negligible for pre-wrapped specimens, with severe structural degradation observed. Despite this, CFRP-confined concrete still outperforms unconfined concrete, which experiences a more rapid strength loss. The stress–strain analysis of the specimens indicates that the wrapping of specimens in both conditions improve the strength and ductility as the pattern show strain hardening behaviour. Post wrapped specimens show better retention in strength and stress–strain pattern even after 400 °C, whereas the pre-wrapped specimens show inefficiency after 300 °C. These findings highlight the need for fire-resistant composite materials to enhance CFRP’s thermal stability for structural applications in high-temperature environments. Artificial Neural networks and Support vector Regression models were developed to anticipate the axial compressive strength of CFRP wrapped concrete cylinders exposed to elevated temperatures. According to the results, ensemble ANN model and ensemble SVR models achieved about 88% and 71% accuracy with error of 0.26 and − 4.4 respectively.