This study puts forward experimental and numerical investigations to understand the response and failure of hybrid concrete beams reinforced by Glass Fibre Reinforced Polymer (GFRP) bars and exposed to elevated temperature. Seven GFRP reinforced hybrid concrete beam specimens were designed according to ACI440.1R-15 (ACI, 2015) and exposed to temperature values between 300 °C and 700 °C and subjected to monolithically increased static load up to failure. The effects of elevated temperature on load- displacement relationships and failure modes were evaluated and discussed. Experimental results have indicated that shear failure is the predominate failure mode of all tested beams. Results have also shown that the maximum reduction in the ultimate load capacity of the hybrid concrete GFRP reinforced concrete beam is about 53% when exposed to temperature value of 700 °C compared with the ultimate load capacity of the beam at ambient temperature.

This paper also suggests and validates a numerical model to simulate the performance and failure of GFRP reinforced hybrid concrete beams under high temperature using the finite element software ABAQUS. The numerical model was firstly verified against the experimental test results and then used to investigate the effect of several important parameters on the performance and ultimate load of GFRP-RC beams under different elevated temperatures.

这项研究提出了实验和数值研究，以了解玻璃纤维增​​强聚合物（GFRP）筋加固并暴露于高温下的混合混凝土梁的响应和破坏。根据ACI440.1R-15（ACI，2015）设计了7个GFRP增强的混合混凝土梁标本，并将其暴露在300°C至700°C的温度范围内，并承受整体的静态载荷直至破坏。评估并讨论了高温对载荷－位移关系和破坏模式的影响。实验结果表明，剪切破坏是所有测试梁的主要破坏模式。

本文还提出并验证了使用有限元软件ABAQUS来模拟GFRP增强混合混凝土梁在高温下的性能和破坏的数值模型。首先针对实验测试结果验证了该数值模型，然后研究了几个重要参数对不同温度下GFRP-RC梁性能和极限荷载的影响。