A new reliability analysis approach for the flexural capacity of post-fire reinforced concrete (RC) beams retrofitted with carbon-fibre-reinforced polymers/plastics (CFRPs) is proposed. In this approach, the thermal parameters of RC beams are first determined to enable heat transfer analysis in Abaqus. Based on the thermal response obtained from the heat transfer analysis, a section method is used to calculate the post-fire residual flexural capacity of RC beams. Reliability analysis of the beams retrofitted with CFRPs is subsequently performed using the Monte Carlo method. The effects of fire exposure time, concrete cover thickness and CFRP usage on the reliability of the flexural capacity of RC beams after fire exposure were studied. This new approach was found to be accurate and effective. It provides an effective reliable model for the evaluation of the mechanical properties of post-fire RC beams strengthened with CFRPs.

中文翻译：

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CFRP加固混凝土梁的火灾后可靠性分析：一种新方法

提出了一种新的碳纤维增强聚合物/塑料（CFRPs）加固后的钢筋混凝土（RC）梁抗弯能力的可靠度分析方法。在这种方法中，首先确定RC梁的热参数以实现Abaqus中的传热分析。基于传热分析获得的热响应，采用截面方法计算RC梁的火灾后残余挠曲能力。随后使用蒙特卡洛方法对CFRP加固的梁进行可靠性分析。研究了火灾时间，混凝土覆盖层厚度和CFRP用量对火灾后RC梁抗弯承载力可靠性的影响。发现这种新方法是准确和有效的。